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POSession Objects when using Spring Webflow
 

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  1. POSession Objects when using Spring Webflow
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    <p>I have few variables which need to be stored in the session as they should be available until the page closes. </p> <p>I came up with session object, that can store the values, so that i can refer them to any class by injecting whenever necessary.</p> <pre><code>@Component @Scope("session") public class SessionObjects { /** * Boradcaster id of the atmosphere */ private String broadCasterId; /** * Atmosphere Resource Id of specific session */ private String senderId; public String getBroadCasterId() { return broadCasterId; } public void setBroadCasterId(String broadCasterId) { this.broadCasterId = broadCasterId; } public String getSenderId() { return senderId; } public void setSenderId(String senderId) { this.senderId = senderId; } } </code></pre> <p>But when i start the application server, it fails with this error.</p> <pre><code>org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'wb': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.emyed.whiteboard.controller.SessionObjects com.emyed.whiteboard.defaults.wb.baseMB; nested exception is java.lang.NullPointerException at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:288) ~[spring-beans-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1116) ~[spring-beans-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519) ~[spring-beans-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458) ~[spring-beans-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295) ~[spring-beans-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223) ~[spring-beans-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292) ~[spring-beans-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) ~[spring-beans-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:626) ~[spring-beans-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932) ~[spring-context-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479) ~[spring-context-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:389) ~[spring-web-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:294) ~[spring-web-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112) [spring-web-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939) [catalina.jar:7.0.42] at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434) [catalina.jar:7.0.42] at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) [catalina.jar:7.0.42] at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) [catalina.jar:7.0.42] at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) [catalina.jar:7.0.42] at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633) [catalina.jar:7.0.42] at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:976) [catalina.jar:7.0.42] at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1653) [catalina.jar:7.0.42] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441) [na:1.6.0_25] at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) [na:1.6.0_25] at java.util.concurrent.FutureTask.run(FutureTask.java:138) [na:1.6.0_25] at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [na:1.6.0_25] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [na:1.6.0_25] at java.lang.Thread.run(Thread.java:662) [na:1.6.0_25] Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.emyed.whiteboard.controller.SessionObjects com.emyed.whiteboard.defaults.wb.baseMB; nested exception is java.lang.NullPointerException at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:514) ~[spring-beans-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87) ~[spring-beans-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:285) ~[spring-beans-3.2.3.RELEASE.jar:3.2.3.RELEASE] ... 27 common frames omitted Caused by: java.lang.NullPointerException: null at org.springframework.web.context.request.SessionScope.get(SessionScope.java:91) ~[spring-web-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:329) ~[spring-beans-3.2.3.RELEASE.jar:3.2.3.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) ~[spring-beans-3.2.3.RELEASE.jar:3.2.3.RELEASE] </code></pre> <p>Sample wb class</p> <pre><code>@Named public class Wb implements Serializable{ @Autowired private SessionObjects sessionObj; /** * Creates a new whiteboard * * @return string outcome for navigation */ public WhiteboardIdentifiers create() { String senderId = UUID.randomUUID().toString(); String whiteboardID = UUID.randomUUID().toString(); UserData creator = new UserData(senderId, getCreator(),null); return createWhiteboard.create( senderId, whiteboardID, creator); } public DisplayWhiteboard setDisplayWhiteboard(WhiteboardIdentifiers wbIdentifiers){ ........ // set the id's in the baseMB sessionObj.setBroadCasterId(whiteboardId); //Chat Controller ...... sessionObj.setSenderId(senderId); whiteboard.getUserController().activateUser(senderId); } } </code></pre>
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    1. PTQuestion
    1. USuser1595858
    1. USuser1595858
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    1. COThis is weird. The source code for `SessionScope#get()` shows no indication that anything could be `null`. Either it succeeds or throws an exception. Is this bean created in the context of a request?
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      1. POSession Objects when using Spring Webflow
      1. USSotirios Delimanolis
    2. COIt is weird to me too, other inject bean not having any issue except this one. Right when I start the tomcat, it fails with this error.
      singulars
      1. POSession Objects when using Spring Webflow
      1. USuser1595858
    3. COThen that is your problem. If you are creating a bean of your `SessionObjects` class at startup, of course it will fail (but i wouldn't think with NPE) because there is no associated `HttpServletRequest` or `HttpSession`.
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      1. POSession Objects when using Spring Webflow
      1. USSotirios Delimanolis
 

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