[jboss-user] [JBoss Seam] - Re: Beginner: Bind SelectOneMenu to @onetoone entity object

[Interista]

Hi,
new problem when trying to use the convertEntity tag, 

Page:

  | <h:selectOneMenu value="#{category.parentCategory}">
  |                             <s:selectItems var="categoryItem" value="#{categoryController.allCategories}" label="#{categoryItem.categoryName}" noSelectionLabel="Parent"/>
  |                             <s:convertEntity/>
  |                         </h:selectOneMenu>
  | 

Entity has implemented equals() and hashCode()

Exception:

  | 22:33:26,625 ERROR [[Faces Servlet]] Servlet.service() for servlet Faces Servlet threw exception
  | java.lang.NullPointerException
  |         at org.jboss.seam.ui.converter.EntityConverterStore.getEntityManager(EntityConverterStore.java:81)
  |         at org.jboss.seam.ui.converter.EntityConverterStore.put(EntityConverterStore.java:60)
  |         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.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:40)
  |         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:106)
  |         at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:155)
  |         at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:91)
  |         at org.jboss.seam.ui.converter.EntityConverterStore_$$_javassist_0.put(EntityConverterStore_$$_javassist_0.java)
  |         at org.jboss.seam.ui.converter.EntityConverter.getAsString(EntityConverter.java:67)
  |         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.render.Renderer.encodeChildren(Renderer.java:137)
  |         at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:812)
  |         at javax.faces.component.UIComponent.encodeAll(UIComponent.java:886)
  |         at javax.faces.component.UIComponent.encodeAll(UIComponent.java:892)
  |         at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:577)
  |         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$FilterChainImpl.doFilter(SeamFilter.java:83)
  |         at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:58)
  |         at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
  |         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:44)
  |         at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
  |         at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
  |         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
  |         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  |         at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
  |         at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
  |         at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  |         at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
  |         at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
  |         at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179)
  |         at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
  |         at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
  |         at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
  |         at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
  |         at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
  |         at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241)
  |         at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
  |         at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580)
  |         at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
  |         at java.lang.Thread.run(Thread.java:619)
  | 

Controller:

  | @Stateless
  | @Name("categoryController")
  | @Scope(ScopeType.SESSION)
  | public class CategoryControllerImpl implements CategoryController {
  |     @PersistenceContext(unitName = "database")
  |     private EntityManager entityManager;
  |     private List<Category> allCategories;
  |     @Out()
  |     public List<Category> getAllCategories() {
  |         return entityManager.createQuery("select c FROM Category c").getResultList();
  |     }
  | 

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