I'm using springframework first time. So wrote a small program and to test value of Instance variable generated in IoC. But I am getting below error:
Feb 24, 2019 10:40:13 PM org.springframework.context.support.AbstractApplicationContext refresh
WARNING: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanDefinitionStoreException: Invalid bean definition with name 'loadingObject' defined in class path resource [Spring-Config.xml]: Could not resolve placeholder 'log4j.configuration' in value "${log4j.configuration}"; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'log4j.configuration' in value "${log4j.configuration}"
Exception in thread "main" org.springframework.beans.factory.BeanDefinitionStoreException: Invalid bean definition with name 'loadingObject' defined in class path resource [Spring-Config.xml]: Could not resolve placeholder 'log4j.configuration' in value "${log4j.configuration}"; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'log4j.configuration' in value "${log4j.configuration}"
at org.springframework.beans.factory.config.PlaceholderConfigurerSupport.doProcessProperties(PlaceholderConfigurerSupport.java:228)
at org.springframework.beans.factory.config.PropertyPlaceholderConfigurer.processProperties(PropertyPlaceholderConfigurer.java:213)
at org.springframework.beans.factory.config.PropertyResourceConfigurer.postProcessBeanFactory(PropertyResourceConfigurer.java:86)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:286)
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:166)
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:691)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:528)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:144)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:85)
at com.jcg.spring.log4j.Mainclass.main(Mainclass.java:12)
Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'log4j.configuration' in value "${log4j.configuration}"
at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:172)
at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124)
at org.springframework.beans.factory.config.PropertyPlaceholderConfigurer$PlaceholderResolvingStringValueResolver.resolveStringValue(PropertyPlaceholderConfigurer.java:232)
at org.springframework.beans.factory.config.BeanDefinitionVisitor.resolveStringValue(BeanDefinitionVisitor.java:296)
at org.springframework.beans.factory.config.BeanDefinitionVisitor.resolveValue(BeanDefinitionVisitor.java:217)
at org.springframework.beans.factory.config.BeanDefinitionVisitor.visitPropertyValues(BeanDefinitionVisitor.java:147)
at org.springframework.beans.factory.config.BeanDefinitionVisitor.visitBeanDefinition(BeanDefinitionVisitor.java:85)
at org.springframework.beans.factory.config.PlaceholderConfigurerSupport.doProcessProperties(PlaceholderConfigurerSupport.java:225)
... 9 more
I've placed my application.properties file and Spring-Config.xml metadata file to this location ...\src\main\resources
application.properties
log4j.configuration=C:\Softwares\ConfigFiles\log4j.properties
Spring-Config.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<bean id="propertiesToBeTaken" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath*:application.properties</value>
<value>classpath*:*keys.properties</value>
</list>
</property>
</bean>
<bean id = "loadingObject" class = "com.jcg.spring.log4j.TestController">
<property name="log4jConfig" value="${log4j.configuration}" />
</bean>
</beans>
Code Snippet
public class TestController {
public String log4jConfig;
public void setlog4j(String log4jConfig){
this.log4jConfig = log4jConfig;
}
public String getlog4j(){
return this.log4jConfig;
}
}
public class Mainclass {
public static void main(String[] args){
ApplicationContext context = new ClassPathXmlApplicationContext("Spring-Config.xml");
TestController obj = (TestController) context.getBean("TestController");
System.out.println(obj.log4jCongif);
}
}
Everything seems to be okay, But not sure why this error is coming. Stuck in this for a while. Can anyone please have a look? What I am missing?
Thanks
It seems Spring container is trying to instantiate TestController bean before the PropertyPlaceholderConfigurer so property is not getting resolved, hence the error.
You can try putting <property name="ignoreUnresolvablePlaceholders" value="true"/> into Spring-Config.xml to tell spring to ignore unresolved properties. Once PropertyPlaceholderConfigurer will be instantiated possibly property will get resolved.
Try this
<bean id="propertiesToBeTaken" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:application.properties</value>
<value>classpath:keys.properties</value>
</list>
</property>
<property name="ignoreUnresolvablePlaceholders" value="true"/>
</bean>
Plus few more changes:
TestController obj = (TestController) context.getBean("loadingObject");