[jboss-user] [JBoss Seam] - Help: problem with EntityHome

[qzhengyy]

Hi,

  I am having problem using EntityHome.  I have an entity class Foo, follow the Seam documentation in Section 10.2 I define a FooHome class


  | public FooHome extends EntityHome<Foo> {
  | }
  | 

First I get null pointer exception because getEntityManager() returns null. I solve this problem by injecting an entity manager. Now when I call persist() I get the following exception:

  | java.lang.NullPointerException
  | 	at com.ericsson.ems.FooHome.persist(FooHome.java:32)
  | 	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:585)
  | 	at org.jboss.seam.util.Reflections.invoke(Reflections.java:20)
  | 	at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:31)
  | 	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:57)
  | 	at org.jboss.seam.interceptors.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:47)
  | 	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69)
  | 	at org.jboss.seam.interceptors.ManagedEntityIdentityInterceptor.aroundInvoke(ManagedEntityIdentityInterceptor.java:37)
  | 	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69)
  | 	at org.jboss.seam.interceptors.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:34)
  | 	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69)
  | 	at org.jboss.seam.interceptors.TransactionInterceptor$1.work(TransactionInterceptor.java:32)
  | 	at org.jboss.seam.util.Work.workInTransaction(Work.java:37)
  | 	at org.jboss.seam.interceptors.TransactionInterceptor.aroundInvoke(TransactionInterceptor.java:27)
  | 	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69)
  | 	at org.jboss.seam.interceptors.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:27)
  | 	at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69)
  | 	at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:103)
  | 	at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:151)
  | 	at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:87)
  | 	at com.ericsson.ems.Eda1500Home_$$_javassist_115.persist(Eda1500Home_$$_javassist_115.java)
  | 	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:585)
  | 	at com.sun.el.parser.AstValue.invoke(AstValue.java:174)
  | 	at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:286)
  | 	at com.sun.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:68)
  | 	at com.sun.facelets.el.LegacyMethodBinding.invoke(LegacyMethodBinding.java:69)
  | 	at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:63)
  | 	at javax.faces.component.UICommand.broadcast(UICommand.java:106)
  | 	at org.ajax4jsf.framework.ajax.AjaxViewRoot.processEvents(AjaxViewRoot.java:180)
  | 	at org.ajax4jsf.framework.ajax.AjaxViewRoot.broadcastEvents(AjaxViewRoot.java:158)
  | 	at org.ajax4jsf.framework.ajax.AjaxViewRoot.processApplication(AjaxViewRoot.java:329)
  | 	at org.apache.myfaces.lifecycle.LifecycleImpl.invokeApplication(LifecycleImpl.java:343)
  | 	at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:86)
  | 	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:137)
  | 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
  | 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  | 	at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:63)
  | 	at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:60)
  | 	at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  | 	at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
  | 	at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  | 	at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:57)
  | 	at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  | 	at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:79)
  | 	at org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  | 	at org.jboss.seam.web.SeamFilter.doFilter(SeamFilter.java:84)
  | 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
  | 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  | 	at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:96)
  | 	at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:220)
  | 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
  | 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  | 	at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
  | 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
  | 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  | 	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
  | 	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
  | 	at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
  | 	at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
  | 	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
  | 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
  | 	at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)
  | 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
  | 	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
  | 	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
  | 	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
  | 	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
  | 	at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
  | 	at java.lang.Thread.run(Thread.java:595)
  | 
For debugging purpose, I redefined persist method in FooHome and cut and paste the code from EntityHome.persist. The null pointer exception is caused by PersistenceProvide.instance() returns null. Am I missing something? I thought when I use EntityHome I don't need to anything in the XML configuration file.

  Thanks in advance.
  
  Qing

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