I need to autowire ServletContextResource in class that implements InitializingBean

StackOverflow https://stackoverflow.com/questions/3990708

  •  10-10-2019
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Question

I need to get ServletContextResource in class that implements InitializingBean, how is that possible? I tried with following, code but it get expcetion for that code.

Code:

public class InitBean implements InitializingBean {
    @Autowired private ServletContextResource context;

    @Override
    public void afterPropertiesSet() throws Exception {
        // load file from WEB-INF folder here
    }

}

dispatcher-servlet.xml:

<!-- InitBean -->
<bean id="initBean" class="InitBean">
<constructor-arg>
    <value>/WEB-INF/init.properties</value> 
</constructor-arg>

Exception:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'initBean': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.springframework.web.context.support.ServletContextResource InitBean.context; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No matching bean of type [org.springframework.web.context.support.ServletContextResource] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:286)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1064)
    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:291)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.context.support.AbstractApplicationContext.initMessageSource(AbstractApplicationContext.java:755)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:413)
    at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:276)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:197)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
    at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:548)
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:136)
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250)
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
    at org.mortbay.jetty.Server.doStart(Server.java:224)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:185)
    at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:149)
    at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:219)
    at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:164)
    at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48)
    at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java:113)
    at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:89)
Was it helpful?

Solution

I think you are mis-using or mis-understanding @Autowired.

@Autowired means that you are telling Spring to find a bean of type ServletContextResource in your context (the dispatcher-servlet.xml file or any other context files you are importing), and wire it into the InitBean instance.

From the error message, you do not have any ServletContextResource beans in the context, thus this fails.

Are you sure you want to be autowiring a type like this? Instead, you can simply inject a Resource into the class, and have the Spring context resolve things like where the file is located on disk, etc.

It sounds like you are on this path, but I do not understand why you would both attempt to configure the bean with a constructor-arg of the file path and then use @Autowired.

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