Could Not Resolve Placeholder In Value | Read Application.Properties File In Spring Boot Using @Value Annotation 27654 투표 이 답변

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In this video we will see how to read application.properties File with Spring Boot using @Value annotation.
Properties file is basically having key-value pairs. You can store database properties there.
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could not resolve placeholder in value 주제에 대한 자세한 내용은 여기를 참조하세요.

Could not resolve placeholder in string value – java

This Issue occurs if the application is unable to access the some_file_name.properties file.Make sure that the properties file …

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Source: stackoverflow.com

Date Published: 11/4/2021

View: 3592

[Solved] java.lang.IllegalArgumentException: Could not …

To Solve java.lang.IllegalArgumentException: Could not resolve placeholder Error You just need to add this lines in your pom.xml file under the …

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Source: exerror.com

Date Published: 2/16/2022

View: 6654

java.lang.IllegalArgumentException: Could not resolve …

IllegalArgumentException: Could not resolve placeholder ‘message’ in value “${message}”. The spring boot application failed at startup with the …

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Source: www.yawintutor.com

Date Published: 6/30/2022

View: 8311

springboot-How to resolve IllegalArgumentException Could …

This article would demo how to resolve IllegalArgumentException:Could not resolve placeholder when using @Value in Spring app or SpringBoot …

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Source: www.bswen.com

Date Published: 6/28/2022

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Spring boot prompt could not resolve placeholder in string value

Spring boot prompt could not resolve placeholder in string value … If it exists, add the primary key of propertysource to the configuration …

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Source: programmerah.com

Date Published: 10/7/2022

View: 6691

Unable to debug spring boot : Could not resolve placeholder

Unable to debug spring boot : Could not resolve placeholder … in value “${it.dwind.spring.flower.brging.external.remote-url}”.

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Source: youtrack.jetbrains.com

Date Published: 7/23/2022

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java.lang.IllegalArgumentException Could not resolve …

IllegalArgumentException: Could not resolve placeholder ‘test.flag’ in value “${test.flag}” exception. If we define a properties file with a …

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Source: www.netsurfingzone.com

Date Published: 9/19/2022

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[Fixed] java.lang.IllegalArgumentException: Could not resolve …

To Fix java.lang.IllegalArgumentException: Could not resolve …

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Source: cnpubf.com

Date Published: 10/13/2021

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Spring Boot Could Not Resolve Placeholder Application Yml

IllegalArgumentException: Could not resolve placeholder ‘jwt.secret’ in value “${jwt.secret}”. This is my application.yml located at src/main/resources.

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Source: www.faqcode4u.com

Date Published: 3/8/2021

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1.4.3 error Could not resolve placeholder · Issue #7977 – GitHub

it`s should be ini. Acutally behavior new it`s :java.lang.IllegalArgumentException: Could not resolve placeholder ‘flag’ in value “${flag}”.

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Date Published: 12/18/2021

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주제와 관련된 이미지 could not resolve placeholder in value

주제와 관련된 더 많은 사진을 참조하십시오 Read application.properties File In Spring Boot Using @Value Annotation. 댓글에서 더 많은 관련 이미지를 보거나 필요한 경우 더 많은 관련 기사를 볼 수 있습니다.

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주제에 대한 기사 평가 could not resolve placeholder in value

• Author: Infybuzz
• Views: 조회수 10,979회
• Likes: 좋아요 159개
• Date Published: 2020. 7. 25.
• Video Url link: https://www.youtube.com/watch?v=cXa5rxOE6tk

Could not resolve placeholder in java?

Solution 2

Check the application. properties file or system environment properties with the name of the key specified in the @Value annotation in the Java Spring Boot class. If the name of the property does not exist or varies from the required one, correct the name of the property key as per the java class.

What is context property placeholder?

The context:property-placeholder tag is used to externalize properties in a separate file. It automatically configures PropertyPlaceholderConfigurer , which replaces the ${} placeholders, which are resolved against a specified properties file (as a Spring resource location).

What is a Propertysourcesplaceholderconfigurer used for?

The PropertyPlaceholderConfigurer is a property resource configurer that resolves placeholders in bean property values of context definitions. It pulls values from a properties file into bean definitions.

What is application properties in spring boot?

Properties File

Properties files are used to keep ‘N’ number of properties in a single file to run the application in a different environment. In Spring Boot, properties are kept in the application. properties file under the classpath. The application.properties file is located in the src/main/resources directory.

What is @value annotation in spring?

Spring @Value annotation is used to assign default values to variables and method arguments. We can read spring environment variables as well as system variables using @Value annotation. Spring @Value annotation also supports SpEL.

Is Java Lang IllegalArgumentException could not resolve placeholder?

To Solve java. lang. IllegalArgumentException: Could not resolve placeholder Error You just need to add this lines in your pom. xml file under the <resources> section.

What is a placeholder in XML?

placeholder (Custom XML Element Placeholder Text)

This element specifies the placeholder text which shall be displayed in place of this custom XML element when the contents of this custom XML markup are empty (i.e. there are no runs of text within the current custom XML element).

What is the purpose of @configuration annotation?

One of the most important annotations in spring is @Configuration annotation which indicates that the class has @Bean definition methods. So Spring container can process the class and generate Spring Beans to be used in the application. This annotation is part of the spring core framework.

How do I view properties file in spring boot?

Another method to access values defined in Spring Boot is by autowiring the Environment object and calling the getProperty() method to access the value of a property file.

How read properties file in Spring XML?

What is a BeanFactoryPostProcessor and what is it used for when is it invoked?

BeanFactoryPostProcessor is an interface that contains single method postProcessBeanFactory , implementing it allows you to create logic that will modify Spring Bean Metadata before any Bean is created.

How can you externalize constants from a spring configuration file?

You can use properties files, YAML files, environment variables and command-line arguments to externalize configuration. Property values can be injected directly into your beans using the @Value annotation, accessed via Spring’s Environment abstraction or bound to structured objects.

What is @configuration in spring boot?

Spring @Configuration annotation is part of the spring core framework. Spring Configuration annotation indicates that the class has @Bean definition methods. So Spring container can process the class and generate Spring Beans to be used in the application.

How do I enable application properties in spring boot?

Spring Boot Framework comes with a built-in mechanism for application configuration using a file called application. properties. It is located inside the src/main/resources folder, as shown in the following figure.

What is parent POM in Maven POM XML for spring boot?

Spring Boot Starter Parent is a starter project that provides the default configuration for spring-based applications. It is added as a parent in the pom. xml file. The spring-boot-starter-parent defines spring-boot-dependencies as its parent.

How do you use PropertyPlaceholderConfigurer?

To use PropertyPlaceholderConfigurer using annotation, we will create a static bean of it in java configuration class. To externalize the properties we will use PropertyPlaceholderConfigurer with @PropertySource and @Value . @PropertySource: It loads property file.

How set dynamic value in properties file in spring boot?

Could not resolve placeholder in string value

I am trying to use properties from a .properties file, but it doesn’t seem to work.

Here is my code:

@Service(“ServiceFTP”) @Transactional public class ServiceFTPImpl implements ServiceFTP { @Value(“${project.ftp.adresse}”) private String adresse; @Value(“${project.ftp.login}”) private String compte; @Value(“${project.ftp.password}”) private String motDePasse; @Value(“${project.ftp.root}”) private String ROOT; […] }

This class uses @Value annotations to get the properties. It is also declared as a Spring Service and is linked to my infraContext.xml file :

[…]

Using context:property-placeholder , I link this file to my context-core.properties file :

project.ftp.adresse = localhost project.ftp.login = anonymous project.ftp.password = project.ftp.root = /anonymous/

This does make sense, right ?

But when I try to launch my project, Tomcat throw this exception :

ERROR [context.ContextLoader.initWebApplicationContext()] Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘ServiceFTP’: Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.lang.String project.sins.service.impl.ServiceFTPImpl.adresse; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder ‘project.ftp.adresse’ in string value “${project.ftp.adresse}” at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:287) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1106) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:607) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:925) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:472) at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:388) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:293) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:111) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4887) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5381) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633) at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:657) at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1636) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) at java.util.concurrent.FutureTask.run(FutureTask.java:166) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:722) Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private java.lang.String project.sins.service.impl.ServiceFTPImpl.adresse; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder ‘project.ftp.adresse’ in string value “${project.ftp.adresse}” at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:513) at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:92) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:284) … 27 more Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder ‘project.ftp.adresse’ in string value “${project.ftp.adresse}” at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:173) at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:125) at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:151) at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:142) at org.springframework.context.support.PropertySourcesPlaceholderConfigurer$2.resolveStringValue(PropertySourcesPlaceholderConfigurer.java:169) at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:748) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:740) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:730) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:485) … 29 more

Or, in short : java.lang.IllegalArgumentException: Could not resolve placeholder ‘project.ftp.adresse’ in string value “${project.ftp.adresse}”

EDIT :

Here is my web.xml :

Project org.springframework.web.util.Log4jConfigListener log4jExposeWebAppRoot false ExpiresFilter org.apache.catalina.filters.ExpiresFilter ExpiresByType text/html now plus 0 seconds ExpiresByType application/json now plus 0 seconds ExpiresFilter /* REQUEST EncodingFilter org.springframework.web.filter.CharacterEncodingFilter encoding UTF-8 forceEncoding true EncodingFilter /* springSecurityFilterChain org.springframework.web.filter.DelegatingFilterProxy springSecurityFilterChain /* Spring OpenEntityManagerInViewFilter org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter Spring OpenEntityManagerInViewFilter /* struts2 org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter struts2 /* index.jsp org.springframework.web.context.ContextLoaderListener org.apache.struts2.tiles.StrutsTilesListener org.apache.tiles.impl.BasicTilesContainer.DEFINITIONS_CONFIG /WEB-INF/tiles/user.xml jdbc/si_nsg javax.sql.DataSource Container 60

My infraContext.xml is imported in another .xml file named applicationContext.xml :

[…]

I am obviously missing something, but I can’t figure out what.

Please let me know if you need more details, as it is my first question here, I’ll try to answer as soon as I can :).

[Solved] java.lang.IllegalArgumentException: Could not resolve placeholder

Hello Guys, How are you all? Hope You all Are Fine. Today Whenever I am running spring-boot project I am facing following error Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder ‘name’ in string value “${name}” in Java. So Here I am Explain to you all the possible solutions here.

Without wasting your time, Let’s start This Article to Solve This Error.

How This Error Occurs ?

Whenever I am running spring-boot project I am facing following error.

Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder ‘language’ in string value “${language}”

How To Solve java.lang.IllegalArgumentException: Could not resolve placeholder Error ?

How To Solve java.lang.IllegalArgumentException: Could not resolve placeholder Error? To Solve java.lang.IllegalArgumentException: Could not resolve placeholder Error You just need to add this lines in your pom.xml file under the section. Now, your error might be solved. Second solution is Just try to Rebuild Project with Build -> Rebuild Project, Now your error should be fixed. java.lang.IllegalArgumentException: Could not resolve placeholder To Solve java.lang.IllegalArgumentException: Could not resolve placeholder Error You just need to add this lines in your pom.xml file under the section. Now, your error might be solved. Second solution is Just try to Rebuild Project with Build -> Rebuild Project, Now your error should be fixed.

Solution 1: add following code in pom.xml

You just need to add this lines in your pom.xml file under the section.

src/main/resources true **/*.properties

Now, your error might be solved.

Solution 2: Rebuild Project

Just try to Rebuild Project with Build -> Rebuild Project, Now your error should be fixed.

Summary

It’s all About this issue. Hope all solution helped you a lot. Comment below Your thoughts and your queries. Also, Comment below which solution worked for you?

Also, Read

java.lang.IllegalArgumentException: Could not resolve placeholder ‘message’ in value “${message}” – Yawin Tutor

The spring boot application failed at startup with the exception java.lang.IllegalArgumentException: Could not resolve placeholder ‘message’. This exception is due to a simple discrepancy between application.properties and the spring boot annotation with in your code.

Spring boot application validates the @Value annotation in spring boot environments at Startup. If the value is not present, then it will throw this exception

Error starting ApplicationContext. To display the conditions report re-run your application with ‘debug’ enabled. 2020-01-23 18:44:44.723 ERROR 86175 — [ restartedMain] o.s.boot.SpringApplication : Application run failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘testController’: Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder ‘message’ in value “${message}” at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:405) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1422) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878) ~[spring-context-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE] at com.yawintutor.SpringBootThymeleafApplication.main(SpringBootThymeleafApplication.java:10) [classes/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_101] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_101] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_101] at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_101] at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.2.4.RELEASE.jar:2.2.4.RELEASE] Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder ‘message’ in value “${message}” at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:178) ~[spring-core-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124) ~[spring-core-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:236) ~[spring-core-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210) ~[spring-core-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties$0(PropertySourcesPlaceholderConfigurer.java:175) ~[spring-context-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:908) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1228) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1207) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] … 22 common frames omitted

Root Cause

Spring boot application validates the setup and properties before starting. The @Value annotation checks the configured key in the spring boot environment. If the value is not present, this exception will be thrown. The @Value annotation checks that the key remains in the properties files.

How to reproduce this issue

Create a local variable in the spring boot java class with an @Value annotation that does not exist in the application.properties file. In Startup, the spring boot application checks for the existence of the key in the application.properties file. This exception will be thrown as this key does not exist in the application.properties file.

application.properties

welcome.message=Welcome to Yawin Tutor

package com.yawintutor; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.GetMapping; @Controller public class TestController { @Value(“${message}”) private String message; @GetMapping(“/”) public String welcome(Model model) { System.out.println(“Message from application.properties : “+message); return “welcome”; } }

Solution 1

In the spring boot java class, check the name of the configured key in the @Value annotation and compare it to the application.properties file. Change the name of the key as in the application.properties. The example below shows that the @Value annotation adjusts the name of the key as per the properties file

welcome.message=Welcome to Yawin Tutor

package com.yawintutor; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.GetMapping; @Controller public class TestController { @Value(“${welcome.message}”) private String message; @GetMapping(“/”) public String welcome(Model model) { System.out.println(“Message from application.properties : “+message); return “welcome”; } }

Solution 2

Check the application.properties file or system environment properties with the name of the key specified in the @Value annotation in the Java Spring Boot class. If the name of the property does not exist or varies from the required one, correct the name of the property key as per the java class. The Java key matches the property file key at startup to address this exception.

message=Welcome to Yawin Tutor

package com.yawintutor; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.GetMapping; @Controller public class TestController { @Value(“${message}”) private String message; @GetMapping(“/”) public String welcome(Model model) { System.out.println(“Message from application.properties : “+message); return “welcome”; } }

Solution 3

If the key name in the @Value annotation is not needed to be specified in the application.properties, the default value for the key can be configured in the @Value annotation. The default value will be configured after the key, separated by a colon (:).

package com.yawintutor; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.GetMapping; @Controller public class TestController { @Value(“${message:Welcome to Yawin Tutor}”) private String message; @GetMapping(“/”) public String welcome(Model model) { System.out.println(“Message from application.properties : “+message); return “welcome”; } }

Solution 4

If you don’t want to set any default value in the @Value annotation, you can assign the java default value to the variable by providing empty default value in the @Value annotation just postfix with colon (:)

java.lang.IllegalArgumentException: Could not resolve placeholder ‘message’ in value “${message}” – Yawin Tutor

The spring boot application failed at startup with the exception java.lang.IllegalArgumentException: Could not resolve placeholder ‘message’. This exception is due to a simple discrepancy between application.properties and the spring boot annotation with in your code.

Spring boot application validates the @Value annotation in spring boot environments at Startup. If the value is not present, then it will throw this exception

Error starting ApplicationContext. To display the conditions report re-run your application with ‘debug’ enabled. 2020-01-23 18:44:44.723 ERROR 86175 — [ restartedMain] o.s.boot.SpringApplication : Application run failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘testController’: Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder ‘message’ in value “${message}” at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:405) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1422) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878) ~[spring-context-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE] at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE] at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE] at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.4.RELEASE.jar:2.2.4.RELEASE] at com.yawintutor.SpringBootThymeleafApplication.main(SpringBootThymeleafApplication.java:10) [classes/:na] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_101] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_101] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_101] at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_101] at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.2.4.RELEASE.jar:2.2.4.RELEASE] Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder ‘message’ in value “${message}” at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:178) ~[spring-core-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124) ~[spring-core-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:236) ~[spring-core-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210) ~[spring-core-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties$0(PropertySourcesPlaceholderConfigurer.java:175) ~[spring-context-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:908) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1228) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1207) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.2.3.RELEASE.jar:5.2.3.RELEASE] … 22 common frames omitted

Root Cause

Spring boot application validates the setup and properties before starting. The @Value annotation checks the configured key in the spring boot environment. If the value is not present, this exception will be thrown. The @Value annotation checks that the key remains in the properties files.

How to reproduce this issue

Create a local variable in the spring boot java class with an @Value annotation that does not exist in the application.properties file. In Startup, the spring boot application checks for the existence of the key in the application.properties file. This exception will be thrown as this key does not exist in the application.properties file.

application.properties

welcome.message=Welcome to Yawin Tutor

package com.yawintutor; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.GetMapping; @Controller public class TestController { @Value(“${message}”) private String message; @GetMapping(“/”) public String welcome(Model model) { System.out.println(“Message from application.properties : “+message); return “welcome”; } }

Solution 1

In the spring boot java class, check the name of the configured key in the @Value annotation and compare it to the application.properties file. Change the name of the key as in the application.properties. The example below shows that the @Value annotation adjusts the name of the key as per the properties file

welcome.message=Welcome to Yawin Tutor

package com.yawintutor; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.GetMapping; @Controller public class TestController { @Value(“${welcome.message}”) private String message; @GetMapping(“/”) public String welcome(Model model) { System.out.println(“Message from application.properties : “+message); return “welcome”; } }

Solution 2

Check the application.properties file or system environment properties with the name of the key specified in the @Value annotation in the Java Spring Boot class. If the name of the property does not exist or varies from the required one, correct the name of the property key as per the java class. The Java key matches the property file key at startup to address this exception.

message=Welcome to Yawin Tutor

package com.yawintutor; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.GetMapping; @Controller public class TestController { @Value(“${message}”) private String message; @GetMapping(“/”) public String welcome(Model model) { System.out.println(“Message from application.properties : “+message); return “welcome”; } }

Solution 3

If the key name in the @Value annotation is not needed to be specified in the application.properties, the default value for the key can be configured in the @Value annotation. The default value will be configured after the key, separated by a colon (:).

package com.yawintutor; import org.springframework.beans.factory.annotation.Value; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.GetMapping; @Controller public class TestController { @Value(“${message:Welcome to Yawin Tutor}”) private String message; @GetMapping(“/”) public String welcome(Model model) { System.out.println(“Message from application.properties : “+message); return “welcome”; } }

Solution 4

If you don’t want to set any default value in the @Value annotation, you can assign the java default value to the variable by providing empty default value in the @Value annotation just postfix with colon (:)

Spring context:property-placeholder tutorial

Spring context:property-placeholder tutorial

last modified July 9, 2020

Spring context:property-placeholder tutorial shows how to use context:property-placeholder tag to externalize properties in a Spring application.

Spring is a popular Java application framework for creating enterprise applications.

Spring context:property-placeholder

The context:property-placeholder tag is used to externalize properties in a separate file. It automatically configures PropertyPlaceholderConfigurer , which replaces the ${} placeholders, which are resolved against a specified properties file (as a Spring resource location).

Spring context:property-placeholder example

The application uses context:property-placeholder to configure properties of a datasource.

pom.xml src ├───main │ ├───java │ │ └───com │ │ └───zetcode │ │ Application.java │ └───resources │ database.properties │ logback.xml │ my-beans.xml └───test └───java

This is the project structure.

pom.xml

4.0.0 com.zetcode propertyplaceholder 1.0-SNAPSHOT UTF-8 11 11 5.1.3.RELEASE ch.qos.logback logback-classic 1.2.3 org.springframework spring-context ${spring-version} org.springframework spring-core ${spring-version} org.springframework spring-jdbc ${spring-version} org.codehaus.mojo exec-maven-plugin 1.6.0 com.zetcode.Application

In the pom.xml file, we have basic Spring dependencies spring-core , spring-context , spring-jdbc and logging logback-classic dependency.

The exec-maven-plugin is used for executing Spring application from the Maven on the command line.

resources/logback.xml

%d{HH:mm:ss.SSS} %blue(%-5level) %magenta(%logger{36}) – %msg %n

The logback.xml is a configuration file for the Logback logging library.

resources/database.properties

db.url=jdbc:h2:mem:testdb db.username=testuser db.password=s$cret

These values are externalized in a database.properties file. This approach is more flexible than placing the values right into the XML file.

resources/my-beans.xml

The context:property-placeholder specifies the location of the properties file; in our case, it is database.properties file in any classpath directory.

A dataSource bean is defined. It takes its values from the properties file via the ${} syntax.

com/zetcode/Application.java

package com.zetcode; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.context.support.GenericXmlApplicationContext; import org.springframework.jdbc.datasource.SimpleDriverDataSource; public class Application { private static final Logger logger = LoggerFactory.getLogger(Application.class); public static void main(String[] args) { var ctx = new GenericXmlApplicationContext(“my-beans.xml”); var dataSource = (SimpleDriverDataSource) ctx.getBean(“dataSource”); logger.info(“Url: {}”, dataSource.getUrl()); logger.info(“User name: {}”, dataSource.getUsername()); logger.info(“Password: {}”, dataSource.getPassword()); ctx.close(); } }

This is the main application class. It retrieves the dataSource bean and prints its properties.

$ mvn -q exec:java 11:27:43.790 INFO com.zetcode.Application – Url: jdbc:h2:mem:testdb 11:27:43.790 INFO com.zetcode.Application – User name: testuser 11:27:43.790 INFO com.zetcode.Application – Password: s$cret

We run the application.

In this tutorial, we have shown how to use context:property-placeholder to externalize properties.

List all Spring tutorials.

Spring PropertyPlaceholderConfigurer Example

With this tutorial we are going to demonstrate how to use the PropertyPlaceholderConfigurer . The PropertyPlaceholderConfigurer is a property resource configurer that resolves placeholders in bean property values of context definitions. It pulls values from a properties file into bean definitions.

We can use it to externalize property values from a bean definition in a separate file using the standard Java Properties format. Doing so enables the person deploying an application to customize environment-specific properties such as database URLs and passwords, without the complexity or risk of modifying the main XML definition file or files for the container.

Let’s consider the simple case where we want to read some properties that are constant variables from an external Properties file. We need an XML-based configuration, where a PropertyPlaceholderConfigurer bean must be defined. At runtime, the PropertyPlaceholderConfigurer is applied to the metadata that will replace the properties of the bean. The values to replace are specified as placeholders of the form ${property-name} .

Our preferred development environment is Eclipse. We are using Eclipse Juno (4.2) version, along with Maven Integration plugin version 3.1.0. You can download Eclipse from here and Maven Plugin for Eclipse from here. The installation of Maven plugin for Eclipse is out of the scope of this tutorial and will not be discussed. We are also using Spring version 3.2.3 and the JDK 7_u_21.

Let’s begin.

1. Create a new Maven project

Go to File -> Project ->Maven -> Maven Project.

In the “Select project name and location” page of the wizard, make sure that “Create a simple project (skip archetype selection)” option is checked, hit “Next” to continue with default values.

In the “Enter an artifact id” page of the wizard, you can define the name and main package of your project. We will set the “Group Id” variable to “com.javacodegeeks.snippets.enterprise” and the “Artifact Id” variable to “springexample” . The aforementioned selections compose the main project package as “com.javacodegeeks.snippets.enterprise.springexample” and the project name as “springexample” . Hit “Finish” to exit the wizard and to create your project.

The Maven project structure is shown below:

It consists of the following folders: /src/main/java folder, that contains source files for the dynamic content of the application,

/src/test/java folder contains all source files for unit tests,

/src/main/resources folder contains configurations files,

/target folder contains the compiled and packaged deliverables,

the pom.xml is the project object model (POM) file. The single file that contains all project related configuration.

2. Add Spring 3.2.3 dependency

Locate the “Properties” section at the “Overview” page of the POM editor and perform the following changes:

Create a new property with name org.springframework.version and value 3.2.3.RELEASE .

Create a new property with name and value . Navigate to the “Dependencies” page of the POM editor and create the following dependencies (you should fill the “GroupId”, “Artifact Id” and “Version” fields of the “Dependency Details” section at that page):

Group Id : org.springframework Artifact Id : spring-web Version : ${org.springframework.version}

Alternatively, you can add the Spring dependencies in Maven’s pom.xml file, by directly editing it at the “Pom.xml” page of the POM editor, as shown below:

pom.xml:

4.0.0 com.javacodegeeks.snippets.enterprise springexample 0.0.1-SNAPSHOT org.springframework spring-core ${spring.version} org.springframework spring-context ${spring.version} 3.2.3.RELEASE

As you can see Maven manages library dependencies declaratively. A local repository is created (by default under {user_home}/.m2 folder) and all required libraries are downloaded and placed there from public repositories. Furthermore intra – library dependencies are automatically resolved and manipulated.

3. Create a simple Spring Bean with properties

We create a simple Spring Bean, HelloWorld , that has two String fields. The fields must be filled with the values read from an external Properties file, that is constants.properties .

HelloWorld.java:

package com.javacodegeeks.snippets.enterprise.services; public class HelloWorld { private String prefixProp; private String suffixProp; public String getPrefixProp() { return prefixProp; } public void setPrefixProp(String prefixProp) { this.prefixProp = prefixProp; } public String getSuffixProp() { return suffixProp; } public void setSuffixProp(String suffixProp) { this.suffixProp = suffixProp; } public void sayHello(){ System.out.println(prefixProp + “!”); } public void sayGoodbye(){ System.out.println(suffixProp + “!”); } }

constants.properties

prefix=Hello suffix=Goodbye

4. Define the PropertyPlaceholderConfigurer.

First, the PropertyPlaceholderConfigurer is defined. It has a property named locations with a value that is the properties file. The file must be in the project class path. Then, the helloWorldBean can be defined, with the properties in the format ${property-name} .

applicationContext.xml

constants.properties

5. Run the application

In the App.class we load the helloWorldBean through the ApplicationContext . The methods called use the properties’ values, that are loaded from the constants.properties file.

App.java:

package com.javacodegeeks.snippets.enterprise; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import com.javacodegeeks.snippets.enterprise.services.HelloWorld; public class App { @SuppressWarnings(“resource”) public static void main(String[] args) { ApplicationContext context = new ClassPathXmlApplicationContext(“applicationContext.xml”); HelloWorld hello = (HelloWorld) context.getBean(“helloWorldBean”); hello.sayHello(); hello.sayGoodbye(); } }

6. Output

When we execute the application we get the values read from the properties file.

Hello! Goodbye!

Spring Boot – Application Properties

Spring Boot – Application Properties

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Application Properties support us to work in different environments. In this chapter, you are going to learn how to configure and specify the properties to a Spring Boot application.

Command Line Properties

Spring Boot application converts the command line properties into Spring Boot Environment properties. Command line properties take precedence over the other property sources. By default, Spring Boot uses the 8080 port number to start the Tomcat. Let us learn how change the port number by using command line properties.

Step 1 − After creating an executable JAR file, run it by using the command java –jar .

Step 2 − Use the command given in the screenshot given below to change the port number for Spring Boot application by using command line properties.

Note − You can provide more than one application properties by using the delimiter −.

Properties File

Properties files are used to keep ‘N’ number of properties in a single file to run the application in a different environment. In Spring Boot, properties are kept in the application.properties file under the classpath.

The application.properties file is located in the src/main/resources directory. The code for sample application.properties file is given below −

server.port = 9090 spring.application.name = demoservice

Note that in the code shown above the Spring Boot application demoservice starts on the port 9090.

YAML File

Spring Boot supports YAML based properties configurations to run the application. Instead of application.properties, we can use application.yml file. This YAML file also should be kept inside the classpath. The sample application.yml file is given below −

spring: application: name: demoservice server: port: 9090

Externalized Properties

Instead of keeping the properties file under classpath, we can keep the properties in different location or path. While running the JAR file, we can specify the properties file path. You can use the following command to specify the location of properties file while running the JAR −

-Dspring.config.location = C:\application.properties

Use of @Value Annotation

The @Value annotation is used to read the environment or application property value in Java code. The syntax to read the property value is shown below −

@Value(“${property_key_name}”)

Look at the following example that shows the syntax to read the spring.application.name property value in Java variable by using @Value annotation.

@Value(“${spring.application.name}”)

Observe the code given below for a better understanding −

import org.springframework.beans.factory.annotation.Value; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; @SpringBootApplication @RestController public class DemoApplication { @Value(“${spring.application.name}”) private String name; public static void main(String[] args) { SpringApplication.run(DemoApplication.class, args); } @RequestMapping(value = “/”) public String name() { return name; } }

Note − If the property is not found while running the application, Spring Boot throws the Illegal Argument exception as Could not resolve placeholder ‘spring.application.name’ in value “${spring.application.name}”.

To resolve the placeholder issue, we can set the default value for the property using thr syntax given below −

@Value(“${property_key_name:default_value}”) @Value(“${spring.application.name:demoservice}”)

Spring Boot Active Profile

Spring Boot supports different properties based on the Spring active profile. For example, we can keep two separate files for development and production to run the Spring Boot application.

Spring active profile in application.properties

Let us understand how to have Spring active profile in application.properties. By default, application. properties will be used to run the Spring Boot application. If you want to use profile based properties, we can keep separate properties file for each profile as shown below −

application.properties

server.port = 8080 spring.application.name = demoservice

application-dev.properties

server.port = 9090 spring.application.name = demoservice

application-prod.properties

server.port = 4431 spring.application.name = demoservice

While running the JAR file, we need to specify the spring active profile based on each properties file. By default, Spring Boot application uses the application.properties file. The command to set the spring active profile is shown below −

You can see active profile name on the console log as shown below −

2017-11-26 08:13:16.322 INFO 14028 — [ main] com.tutorialspoint.demo.DemoApplication : The following profiles are active: dev

Now, Tomcat has started on the port 9090 (http) as shown below −

2017-11-26 08:13:20.185 INFO 14028 — [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 9090 (http)

You can set the Production active profile as shown below −

You can see active profile name on the console log as shown below −

2017-11-26 08:13:16.322 INFO 14028 — [ main] com.tutorialspoint.demo.DemoApplication : The following profiles are active: prod

Now, Tomcat started on the port 4431 (http) as shown below −

2017-11-26 08:13:20.185 INFO 14028 — [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 4431 (http)

Spring active profile for application.yml

Let us understand how to keep Spring active profile for application.yml. We can keep the Spring active profile properties in the single application.yml file. No need to use the separate file like application.properties.

The following is an example code to keep the Spring active profiles in application.yml file. Note that the delimiter (—) is used to separate each profile in application.yml file.

spring: application: name: demoservice server: port: 8080 — spring: profiles: dev application: name: demoservice server: port: 9090 — spring: profiles: prod application: name: demoservice server: port: 4431

To command to set development active profile is given below −

You can see active profile name on the console log as shown below −

2017-11-26 08:41:37.202 INFO 14104 — [ main] com.tutorialspoint.demo.DemoApplication : The following profiles are active: dev

Now, Tomcat started on the port 9090 (http) as shown below −

2017-11-26 08:41:46.650 INFO 14104 — [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 9090 (http)

The command to set Production active profile is given below −

You can see active profile name on the console log as shown below −

2017-11-26 08:43:10.743 INFO 13400 — [ main] com.tutorialspoint.demo.DemoApplication : The following profiles are active: prod

This will start Tomcat on the port 4431 (http) as shown below:

2017-11-26 08:43:14.473 INFO 13400 — [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 4431 (http)

springboot-How to resolve IllegalArgumentException Could not resolve placeholder when use @Value in Spring or SpringBoot app

1. Introduction

When we read properties from files,Sometimes, you would get exception of reading the properties.

This article would demo how to resolve IllegalArgumentException:Could not resolve placeholder when using @Value in Spring app or SpringBoot apps.

2. Environments

SpringBoot 1.x and 2.x

3. The Exception

When we use @Value like this:

@Component @PropertySource ( value ={ “sysconfig.properties” }) public class SysConfig { @Value ( “${myProp}” ) private String myProp ; … }

But, most importantly, there is no myProp property in sysconfig.properties. So we got this exception:

Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder ‘myProp’ in value “$ { myProp } ” at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:174) at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:126) at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:236) at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210) at org.springframework.context.support.PropertySourcesPlaceholderConfigurer$ 2.resolveStringValue ( PropertySourcesPlaceholderConfigurer.java:172 ) at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:846) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1087) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1067) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$ AutowiredFieldElement.inject ( AutowiredAnnotationBeanPostProcessor.java:583 ) at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:364) … 35 common frames omitted

4. How to fix it

4.1 Way 1: Add the property key to your properties file

myProp = test

4.2 Way 2: Provide a default value for the property

If you don’t want to provide the key in your file, just use @Value’s default value:

@Component @PropertySource ( value ={ “sysconfig.properties” }) public class SysConfig { @Value ( “${myProp:defaultValue}” ) private String myProp ; … }

4.3 Way 3: Provide an empty default value for the property

If you want to provide an empty default value, just do like this:

@Component @PropertySource ( value ={ “sysconfig.properties” }) public class SysConfig { @Value ( “${myProp:}” ) private String myProp ; … }

Just leave empty after the colon, then you would get an empty default value for property myProp.

5. Summary

You can see that @Value must be used carefully, if you get the above exception ,just provide the default values of the @Value.

Spring boot prompt could not resolve placeholder in string value

1. Problem description

Spring boot refers to the configuration in YML in entity class

@Value(“${shiro.session.expireTime}”) private final int expireTime = 30;

As soon as the project is started, an error is reported, indicating that could not resolve placeholder in string value. This error is basically caused by “configuration file not found”（ application.yml )】

2. Solutions

Check whether the target / classes directory exists application.yml configuration file

If it exists, add the primary key of propertysource to the configuration class, and judge whether it exists according to the error log application.yml Configuration file.

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java.lang.IllegalArgumentException Could not resolve placeholder

In this post, we will see how to fix java.lang.IllegalArgumentException Could not resolve placeholder exception in Spring Boot. It may be different reasons for Could not resolve placeholder exception. Let’s see a few reasons and fix this exception.

If we forget to define the attribute in application.properties or define the wrong attribute name and use this attribute further in our java we may get java.lang.IllegalArgumentException Could not resolve placeholder.

For example below code will throw java.lang.IllegalArgumentException Could not resolve placeholder.

@Service public class StudentServiceImpl implements StudentService { @Value(“${test.flag}”) private boolean testFlag; @Autowired private StudentRepository studentRepository; @Transactional public Student save(Student student) { Student createResponse = null; if(testFlag){ createResponse = studentRepository.save(student); } //createResponse = studentRepository.save(student); return createResponse; } }

services.properties

In the services.properties file, we are not going to define test.flag attribute.

spring.datasource.url=jdbc:mysql://localhost:3306/springbootcrudexample spring.datasource.username=root spring.datasource.password=root spring.jpa.hibernate.ddl-auto=update spring.jpa.show-sql=true spring.jpa.properties.hibernate.format_sql=true #server.port = 9091 #test.flag=true

The above code snippet will throw Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder ‘test.flag’ in value “${test.flag}” exception.

If we define a properties file with a different name (for example – appconfig.properties) then make sure we are reading it correctly.

Consider we have defined appconfig.properties as below.

@Configuration @EnableJpaRepositories(basePackages = “com.netsurfingzone.repository”) @PropertySource(value={“classpath:appconfig.properties”}) public class JpaConfig { }

or

@Configuration @EnableJpaRepositories(basePackages = “com.netsurfingzone.repository”) @PropertySource(value={“appconfig.properties”}) public class JpaConfig { }

Stacktrace for this exception.

Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder ‘test.flag’ in value “${test.flag}”

at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:178) ~[spring-core-5.2.7.RELEASE.jar:5.2.7.RELEASE]

at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124) ~[spring-core-5.2.7.RELEASE.jar:5.2.7.RELEASE]

at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:239) ~[spring-core-5.2.7.RELEASE.jar:5.2.7.RELEASE]

at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210) ~[spring-core-5.2.7.RELEASE.jar:5.2.7.RELEASE]

at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties$0(PropertySourcesPlaceholderConfigurer.java:175) ~[spring-context-5.2.7.RELEASE.jar:5.2.7.RELEASE]

at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:912) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]

at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1245) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]

at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1224) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]

at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]

at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]

at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.2.7.RELEASE.jar:5.2.7.RELEASE]

… 31 common frames omitted

Let’s see the complete example that will show how to avoid java.lang.IllegalArgumentException Could not resolve placeholder exception.

Student.java

@Entity public class Student implements Serializable { @Id @GeneratedValue(strategy = GenerationType.AUTO) private Long id; @Column(name = “name”) private String name; @Column(name = “roll_number”) private String rollNumber; @Column(name = “university”) private String university; //getter and setter }

StudentService.java

@Component public interface StudentService { public Student save(Student student); public Student update(Student student); public Student get(Long id); public List getStudents(String name); public void delete(Student student); }

StudentRepository.java

@Repository public interface StudentRepository extends JpaRepository { List findByName(String name); }

StudentServiceImpl.java

@Service public class StudentServiceImpl implements StudentService { @Value(“${test.flag}”) private boolean testFlag; @Autowired private StudentRepository studentRepository; @Transactional public Student save(Student student) { Student createResponse = null; if(testFlag){ createResponse = studentRepository.save(student); } //createResponse = studentRepository.save(student); return createResponse; } @Transactional public Student update(Student student) { Student updateResponse = studentRepository.save(student); return updateResponse; } @Transactional public Student get(Long id) { Optional response = studentRepository.findById(id); Student getResponse = response.get(); //String sql = “select name from student”; //List names = jdbcTemplate.queryForList(sql, String.class); //return names; return getResponse; } @Transactional public List getStudents(String name) { List response = new ArrayList<>(); // List response = studentRepository.findByName1(name); //Student getResponse = response.get(); //String sql = “select name from student”; //List names = jdbcTemplate.queryForList(sql, String.class); //return names; return response; } @Transactional public void delete(Student student) { studentRepository.delete(student); } }

StudentController.java

package com.netsurfingzone.controller; import com.netsurfingzone.entity.Student; import com.netsurfingzone.repository.StudentRepository; import com.netsurfingzone.service.StudentService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.*; import org.springframework.web.servlet.ModelAndView; import java.util.List; @RestController @RequestMapping(“/student”) public class StudentController { @Autowired private StudentService studentService; @Autowired private StudentRepository studentRepository; @PostMapping(“/create”) public Student createStudent1(@RequestBody Student student) { Student createResponse = studentService.save(student); return createResponse; } @PutMapping(“/update”) public Student updateStudent(@RequestBody Student student) { Student updateResponse = studentService.update(student); return updateResponse; } /* @GetMapping(“/{id}”) public Student getStudent(@PathVariable Long id) { Student getReponse = studentService.get(id); return getReponse; }*/ @GetMapping(“/{name}”) public List getStudent(@PathVariable String name) { List getReponse = studentService.getStudents(name); return getReponse; } @DeleteMapping(“/delete”) public String deleteStudent(@RequestBody Student student) { studentService.delete(student); return “Record deleted succesfully”; } @GetMapping(“/getcustomfieldsbasisofuserinput”) public String deleteStudent(@RequestParam String fields) { System.out.println(fields); //studentService.delete(student); return “Record deleted succesfully”; } }

JpaConfig.java

@Configuration @EnableJpaRepositories(basePackages = “com.netsurfingzone.repository”) public class JpaConfig { }

SpringMain.java

@SpringBootApplication @ComponentScan(basePackages = “com.netsurfingzone.*”) @EntityScan(“com.netsurfingzone.*”) public class SpringMain { public static void main(String[] args) { SpringApplication.run(SpringMain.class, args); } }

That’s all about java.lang.IllegalArgumentException Could not resolve placeholder exception.

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