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我有以下JSF2控制器/ bb,我注入了一个会话bean。但是,它无法获得对EJB本地会话Bean的引用。JSF2支持Bean无法获得对@注入会话Bean的引用
JSF2辅助Bean:
@ManagedBean
@Named("scorecardBackingBean")
@SessionScoped
public class ScorecardBackingBean implements Serializable {
private static final long serialVersionUID = 7231502115861150753L;
@Inject
private IScorecardServiceBean scorecardServiceBean;
@PostConstruct
private void prepareMainLineChart() {
this.mainLineChart = new CartesianChartModel();
List<OrderVolume> orderVolumeList = this.scorecardServiceBean
.getOrderVolume(); //ERROR here, scorecardServiceBean is null.
}
EJB:
@Stateless
public class ScorecardServiceBean implements IScorecardServiceBean {
}
EJB接口:
@Local
public interface IScorecardServiceBean {
List<OrderVolume> getOrderVolume();
}
遇到的错误:
java.lang.IllegalStateException: JBAS011048: Failed to construct component instance
at org.jboss.as.ee.component.BasicComponent.constructComponentInstance(BasicComponent.java:163)
at org.jboss.as.ee.component.BasicComponent.createInstance(BasicComponent.java:95)
at org.jboss.as.web.deployment.component.WebComponentInstantiator$2.<init>(WebComponentInstantiator.java:96)
at org.jboss.as.web.deployment.component.WebComponentInstantiator.initializeInstance(WebComponentInstantiator.java:94)
.................
Caused by: java.lang.NullPointerException
at sg.java.bus.controller.scorecard.ScorecardBackingBean.prepareMainLineChart(ScorecardBackingBean.java:79)
at sg.java.bus.controller.scorecard.ScorecardBackingBean.init(ScorecardBackingBean.java:61)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.jboss.as.ee.component.ManagedReferenceLifecycleMethodInterceptorFactory$ManagedReferenceLifecycleMethodInterceptor.processInvocation(ManagedReferenceLifecycleMethodInterceptorFactory.java:130)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
at org.jboss.as.ee.component.ManagedReferenceInterceptorFactory$ManagedReferenceInterceptor.processInvocation(ManagedReferenceInterceptorFactory.java:106)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:53)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
at org.jboss.as.ee.component.TCCLInterceptor.processInvocation(TCCLInterceptor.java:45)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)
at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
at org.jboss.as.ee.component.BasicComponent.constructComponentInstance(BasicComponent.java:161)
... 52 more
谢谢马特。我拿出了多余的“@Named(”scorecardBackingBean“)”,但注入的资源是一个EJB会话bean。它仍然给予同样的感觉。 – 2012-07-23 09:47:37
我已经从@Inject更改为EJB,它工作。我需要检查一下,为什么。但是非常感谢。 – 2012-07-23 10:08:51
@Chin这确实很奇怪。两种注射方法都应该起作用(从理论上讲),也许你会在我的答案中添加的第三个链接中得到一些解释。 (我只是看着我的最新项目,我使用'@ Inject'来@Named bean和@EJB来注入ejbs)。 – 2012-07-23 12:49:10