0 Replies Latest reply on Jun 30, 2008 5:21 PM by Binesh Gummadi

    s:entityConverter NullPointerException with Hibernate

    Binesh Gummadi Novice

      Seam version 2.0.1.GA


      I got a NullPointerException when I tried to use s:convertEntity with Hibernate. Here are my settings.



      components.xml
      
              <persistence:hibernate-session-factory
                      name="hibernateSessionFactory" />
      
              <persistence:managed-hibernate-session name="session"
                      auto-create="true" session-factory-jndi-name="java:/sessionFactory" />
      
              <component name="org.jboss.seam.ui.converter.EntityConverter">
                <property name="session">#{session}</property>
              </component>



      <h:selectOneMenu value="#{mybean.gown.gownColor}" required="true">                        
              <s:selectItems value="#{mybean.gownColors}" var="gownColor" label="#{gownColor.color}" noSelectionLabel="Please Select..."/>                                   
              <s:convertEntity/>                                                            
      </h:selectOneMenu>




      mybean (gown object is initialized with execute method in pages.xml)
       private Gown gown;
           public Gown getGown() {
                return gown;
           }
      
           public void setGown(Gown gown) {
                this.gown = gown;
           }




      Exception
      java.lang.NullPointerException
           at org.jboss.seam.ui.converter.entityConverter.EntityLoader.getPersistenceContext(EntityLoader.java:30)
           at org.jboss.seam.ui.converter.entityConverter.EntityLoader.getPersistenceContext(EntityLoader.java:24)
           at org.jboss.seam.ui.converter.entityConverter.AbstractEntityLoader.put(AbstractEntityLoader.java:46)
           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:21)
           at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:31)
           at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56)
           at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:31)
           at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
           at org.jboss.seam.transaction.TransactionInterceptor$1.work(TransactionInterceptor.java:38)
           at org.jboss.seam.util.Work.workInTransaction(Work.java:41)
           at org.jboss.seam.transaction.TransactionInterceptor.aroundInvoke(TransactionInterceptor.java:32)
           at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
           at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:42)
           at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
           at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
           at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:166)
           at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:102)
           at org.jboss.seam.ui.converter.entityConverter.EntityLoader_$$_javassist_3.put(EntityLoader_$$_javassist_3.java)
           at org.jboss.seam.ui.converter.EntityConverter.getAsString(EntityConverter.java:77)
           at org.jboss.seam.ui.converter.PrioritizableConverter.getAsString(PrioritizableConverter.java:67)
           at org.jboss.seam.ui.converter.ConverterChain.getAsString(ConverterChain.java:123)
           at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getFormattedValue(HtmlBasicRenderer.java:469)
           at com.sun.faces.renderkit.html_basic.MenuRenderer.renderOption(MenuRenderer.java:502)
           at com.sun.faces.renderkit.html_basic.MenuRenderer.renderOptions(MenuRenderer.java:757)
           at com.sun.faces.renderkit.html_basic.MenuRenderer.renderSelect(MenuRenderer.java:811)
           at com.sun.faces.renderkit.html_basic.MenuRenderer.encodeEnd(MenuRenderer.java:335)
           at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:836)
           at javax.faces.component.UIComponent.encodeAll(UIComponent.java:896)
           at javax.faces.component.UIComponent.encodeAll(UIComponent.java:892)
           at javax.faces.component.UIComponent.encodeAll(UIComponent.java:892)
           at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:592)
           at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:108)
           at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:189)
           at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
           at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
           at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
           at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
           at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
           at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
           at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
           at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:85)
           at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
           at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
           at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
           at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
           at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
           at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:147)
           at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:276)
           at org.ajax4jsf.Filter.doFilter(Filter.java:175)
           at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:60)
           at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
           at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58)
           at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
           at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
           at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
           at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
           at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
           at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
           at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
           at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
           at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
           at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
           at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
           at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
           at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
           at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
           at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
           at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
           at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
           at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
           at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
           at java.lang.Thread.run(Thread.java:613)
      



      Lets carefully review the exception
      (org.jboss.seam.ui.converter.entityConverter.EntityLoader.getPersistenceContext(EntityLoader.java:30)). why is it looking for EntityLoader? Shouldn't it be looking for HibernateEntityLoader? Looking at the code below from EntityConverter it should create HibernateEntityLoader instance. So when getPersistenceContextName is called, a session string is returned. Why is it still looking for entityManager?


      Is this due to a misconfiguration? Would appreciate any help.



      EntityConverter
         @Create
         public void create()
         {
            if (getEntityManager() == null && getSession() != null)
            {
               store = HibernateEntityLoader.instance();
            }
            else
            {
               store = EntityLoader.instance();
            }
         }