WHY?? Cannot create Seam component, scope is not active: entityManager(CONVERSATION)
lee3star.lee3star.gmail.com May 18, 2010 5:33 PMI used seam gen to create UI pages for my user class. When testing the search function of userList.xhtml page, I got this error:
22:36:56,284 WARN [org.jboss.seam.Component] Cannot create Seam component, scope is not active: entityManager(CONVERSATION)
This it not just a warning, but an error, see the stack trace here:
Caused by java.lang.IllegalStateException with message: "entityManager is null" org.jboss.seam.framework.EntityQuery.validate(EntityQuery.java:41) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) java.lang.reflect.Method.invoke(Unknown Source) org.jboss.seam.util.Reflections.invoke(Reflections.java:22) org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:32) org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56) org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:28) org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) org.jboss.seam.transaction.TransactionInterceptor$1.work(TransactionInterceptor.java:97) org.jboss.seam.util.Work.workInTransaction(Work.java:61) org.jboss.seam.transaction.TransactionInterceptor.aroundInvoke(TransactionInterceptor.java:91) org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44) org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107) org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:185) org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:103) com.open18.action.UserList_$$_javassist_seam_3.validate(UserList_$$_javassist_seam_3.java) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) java.lang.reflect.Method.invoke(Unknown Source) org.jboss.seam.util.Reflections.invoke(Reflections.java:22) org.jboss.seam.util.Reflections.invokeAndWrap(Reflections.java:144) org.jboss.seam.Component.callComponentMethod(Component.java:2261) org.jboss.seam.Component.callCreateMethod(Component.java:2184) org.jboss.seam.Component.newInstance(Component.java:2144) org.jboss.seam.Component.getInstance(Component.java:2021) org.jboss.seam.Component.getInstance(Component.java:1983) org.jboss.seam.Component.getInstance(Component.java:1977) org.jboss.seam.Namespace.getComponentInstance(Namespace.java:55) org.jboss.seam.Namespace.getComponentInstance(Namespace.java:50) org.jboss.seam.el.SeamELResolver.resolveBase(SeamELResolver.java:148) org.jboss.seam.el.SeamELResolver.getValue(SeamELResolver.java:51) javax.el.CompositeELResolver.getValue(CompositeELResolver.java:175) com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72) org.jboss.el.parser.AstIdentifier.getValue(AstIdentifier.java:44) org.jboss.el.parser.AstValue.getValue(AstValue.java:63) org.jboss.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186) com.sun.facelets.el.TagValueExpression.getValue(TagValueExpression.java:71) javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:190) javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:178) javax.faces.component.UIData.getValue(UIData.java:554) org.ajax4jsf.component.UIDataAdaptorBase.getValue(UIDataAdaptorBase.java:1647) org.ajax4jsf.component.SequenceDataAdaptor.getDataModel(SequenceDataAdaptor.java:65) org.ajax4jsf.component.SequenceDataAdaptor.createDataModel(SequenceDataAdaptor.java:59) org.richfaces.component.UIDataTable.createDataModel(UIDataTable.java:121) org.ajax4jsf.component.UIDataAdaptorBase.getExtendedDataModel(UIDataAdaptorBase.java:621) org.ajax4jsf.component.UIDataAdaptorBase.getRowIndex(UIDataAdaptorBase.java:311) javax.faces.component.UIData.visitTree(UIData.java:1183) javax.faces.component.UIComponent.visitTree(UIComponent.java:1457) javax.faces.component.UIComponent.visitTree(UIComponent.java:1457) javax.faces.component.UIViewRoot.processRestoreState(UIViewRoot.java:869) org.ajax4jsf.component.AjaxViewRoot.processRestoreState(AjaxViewRoot.java:761) org.ajax4jsf.application.AjaxStateManager.restoreView(AjaxStateManager.java:456) com.sun.faces.application.view.ViewHandlingStrategy.restoreView(ViewHandlingStrategy.java:131) com.sun.faces.application.view.MultiViewHandler.restoreView(MultiViewHandler.java:143) org.jboss.seam.jsf.SeamViewHandler.restoreView(SeamViewHandler.java:93) com.sun.facelets.FaceletViewHandler.restoreView(FaceletViewHandler.java:316) org.ajax4jsf.application.ViewHandlerWrapper.restoreView(ViewHandlerWrapper.java:107) com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:199) com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:110) com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) javax.faces.webapp.FacesServlet.service(FacesServlet.java:312) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:336) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83) org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:42) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206) org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290) org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388) org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515) org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:60) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.web.HotDeployFilter.doFilter(HotDeployFilter.java:53) org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:274) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:276) org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:183) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:95) org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126) org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70) org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368) org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:872) org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653) org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:951) java.lang.Thread.run(Unknown Source)
I have configured entity manager in components.xml like this:
<persistence:managed-persistence-context name="entityManager" auto-create="true" persistence-unit-jndi-name="java:/open18EntityManagerFactory"/>
Tried but couldn't figure out the reason. Please help