我有下面的JSF托管bean：

package com.example;

import java.io.Serializable;

import javax.faces.bean.ManagedBean;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Component;

@Component

@ManagedBean

public class Bean implements Serializable {

@Autowired

private SomeService someService;

public void update() {

someService.update(someEntity);

}

// ...

}

和下面的Spring服务：

@Transactional

@Repository

public class SomeService {

@Autowired

private SessionFactory sessionFactory;

// ...

}

Spring的配置如下：

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"

xmlns:tx="http://www.springframework.org/schema/tx"

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd

http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

Example configuration to get you started.

当我调用JSF托管bean update()方法时,它抛出NullPointerException：

javax.faces.FacesException: #{bean.update()}: java.lang.NullPointerException

at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:117)

at org.springframework.faces.webflow.FlowActionListener.processAction(FlowActionListener.java:71)

at org.springframework.faces.model.SelectionTrackingActionListener.processAction(SelectionTrackingActionListener.java:55)

at javax.faces.component.UICommand.broadcast(UICommand.java:315)

at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:786)

at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1251)

at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)

at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)

at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)

at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)

at org.ocpsoft.rewrite.servlet.RewriteFilter.doFilter(RewriteFilter.java:191)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)

at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)

at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)

at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)

at java.lang.Thread.run(Thread.java:722)

Caused by: javax.faces.el.EvaluationException: java.lang.NullPointerException

at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:101)

at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:101)

... 28 more

Caused by: java.lang.NullPointerException

at com.example.Bean.update(Bean.java:45)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

at java.lang.reflect.Method.invoke(Method.java:601)

at org.apache.el.parser.AstValue.invoke(AstValue.java:278)

at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:274)

at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)

at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)

... 29 more

换句话说,someService为null.我无法为自己的生活弄清楚原因.我在bean的顶部声明了@Component.所以我希望@Autowired可以正常工作.任何帮助都会很棒！