Newbie needs help with s:convertEntity

[indyjones2]

Can someone please help me with a very simple example using s:convertEntity?

Here is what I have....

components.xml

        <persistence:hibernate-session-factory name="hibernateSessionFactory" />

     <persistence:managed-hibernate-session name="ifnDatabase" auto-create="true" session-factory-jndi-name="java:/ifnSessionFactory" />
     
     <transaction:hibernate-transaction session="#{ifnDatabase}" /> 
  
       <ui:hibernate-entity-loader session="#{ifnDatabase}"/>

Action Bean

@Name("getserviceproviders")
@Scope(ScopeType.PAGE)
public class GetServiceProvidersAction {

 public List<ServiceProvider> getServiceProviders(){ 

...

}

}

Bean

@Entity
public class ServiceProvider implements Serializable {

...

}

xhtml

<h:selectOneMenu id="selMenServiceProviders" >
                            
                            <s:selectItems value="#{getserviceproviders.serviceProviders}" 
                                              var="sp" 
                                              label="#{sp.name}" 
                                              noSelectionLabel="Select Service Provider...." />
 
                            <s:convertEntity />
                       
                    </h:selectOneMenu>  

 
Something is configured or set up wrong....

ANY help would be appreciated....

thanks

indy

[asookazian]

<h:selectOneMenu  id="newStatusMenu"
                                                                           value="#{equipmentProcessingView.selectedListValueForNewStatus}" 
                                                                        required="true">  
                                                            <s:selectItems var="lve" 
                                                                              value="#{populateDropDown.getListValueList('Recovery_Status')}"     
                                                                              label="#{lve.description}"
                                                                              noSelectionLabel="Please Select..."/>
                                                            <s:convertEntity/>
                                                                                           
                                                       </h:selectOneMenu>     

@Name("equipmentProcessingView")
@Scope(ScopeType.CONVERSATION)
@ProfilingThisClass
//@Transactional
public class EquipmentProcessingViewAction implements Serializable {
    private ListValue selectedListValueForNewStatus;
...
public ListValue getSelectedListValueForNewStatus() {
          return selectedListValueForNewStatus;
     }

     public void setSelectedListValueForNewStatus(ListValue selectedListValueForNewStatus) {
          this.selectedListValueForNewStatus = selectedListValueForNewStatus;
     }

@Name("populateDropDown")
@AutoCreate
@Scope(ScopeType.CONVERSATION)
@Transactional
public class PopulateDropDown implements Serializable {
     
     private static final long serialVersionUID = -8836664905031033539L;

     //retrieve all labels/values for a particular drop down
     @Logger
     private Log log;
     
     @In
     private EntityManager entityManager;
          
     private List<ListValue> listValueList;
     
     @SuppressWarnings("unchecked")
     public List<ListValue> getListValueList(String listName)
     {     
          listValueList = entityManager.createQuery(  " select lv "+
                                                                      " from ListValue lv, "+
                                                                      " List l "+
                                                                      " where lv.list.listId = l.listId "+
                                                                      " and l.listName = :listName "+
                                                                      " order by lv.sortId ")
                                                   .setParameter("listName", listName)
                                                   .getResultList();
          
          log.info("in getListValueList: listValueList.size() = " + listValueList.size());
          
          return listValueList;
     }
     
     @SuppressWarnings("unchecked")
     public ListValue getListValue(String listName, Integer listCode)
     {     
          listValueList = entityManager.createQuery(  " select lv "+
                                                                      " from ListValue lv, "+
                                                                      " List l "+
                                                                      " where lv.list.listId = l.listId "+
                                                                      " and l.listName = :listName "+
                                                                      " and lv.code = :listCode")
                                                   .setParameter("listName", listName)
                                                   .setParameter("listCode", listCode)
                                                   .getResultList();
          
          ListValue lve = null;
          
          if (listValueList != null && listValueList.size() > 0)
          {
               lve = listValueList.get(0);
               log.info("in getListValue: getListValue.getDescription() = " + lve.getDescription());
          }
          
          return lve;
     }
     

}

[indyjones2]

When I try the code....I get....

java.lang.NullPointerException
     at org.jboss.seam.persistence.HibernatePersistenceProvider.getSession(HibernatePersistenceProvider.java:369)
     at org.jboss.seam.persistence.HibernatePersistenceProvider.getId(HibernatePersistenceProvider.java:177)
     at org.jboss.seam.framework.EntityIdentifier.<init>(EntityIdentifier.java:13)
     at org.jboss.seam.ui.JpaEntityLoader.createIdentifier(JpaEntityLoader.java:29)
     at org.jboss.seam.ui.AbstractEntityLoader.put(AbstractEntityLoader.java:46)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at org.jboss.seam.util.Reflections.invoke(Reflections.java:22)
     at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:32)
     at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56)
     at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:28)
     at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
     at org.jboss.seam.transaction.TransactionInterceptor$1.work(TransactionInterceptor.java:97)
     at org.jboss.seam.util.Work.workInTransaction(Work.java:47)
     at org.jboss.seam.transaction.TransactionInterceptor.aroundInvoke(TransactionInterceptor.java:91)
     at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
     at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44)
     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:185)
     at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:103)
     at org.jboss.seam.ui.JpaEntityLoader_$$_javassist_seam_7.put(JpaEntityLoader_$$_javassist_seam_7.java)
     at org.jboss.seam.ui.EntityConverter.getAsString(EntityConverter.java:65)
     at org.jboss.seam.ui.converter.PrioritizableConverter.getAsString(PrioritizableConverter.java:67)
     at org.jboss.seam.ui.converter.ConverterChain.getAsString(ConverterChain.java:126)
     at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getFormattedValue(HtmlBasicRenderer.java:448)
     at com.sun.faces.renderkit.html_basic.MenuRenderer.renderOption(MenuRenderer.java:480)
     at com.sun.faces.renderkit.html_basic.MenuRenderer.renderOptions(MenuRenderer.java:772)
     at com.sun.faces.renderkit.html_basic.MenuRenderer.renderSelect(MenuRenderer.java:832)
     at com.sun.faces.renderkit.html_basic.MenuRenderer.encodeEnd(MenuRenderer.java:280)
     at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:861)
     at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:242)
     at com.sun.faces.renderkit.html_basic.GridRenderer.renderRow(GridRenderer.java:180)
     at com.sun.faces.renderkit.html_basic.GridRenderer.encodeChildren(GridRenderer.java:127)
     at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:930)
     at javax.faces.render.Renderer.encodeChildren(Renderer.java:148)
     at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:930)
     at javax.faces.component.UIComponent.encodeAll(UIComponent.java:933)
     at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:592)
     at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100)
     at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176)
     at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110)
     at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
     at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)
     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$FilterChainImpl.doFilter(SeamFilter.java:83)
     at org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90)
     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$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:178)
     at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
     at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:368)
     at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:495)
     at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:56)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:60)
     at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
     at org.jboss.seam.web.HotDeployFilter.doFilter(HotDeployFilter.java:53)
     at org.jboss.seam.servlet.SeamFilter$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.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90)
     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:235)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
     at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
     at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
     at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
     at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
     at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
     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:158)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:828)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:601)
     at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
     at java.lang.Thread.run(Unknown Source)

[asookazian]

You need to carefully examine the Seam booking example project, or another example project in the distro, that uses s:convertEntity for an example.

Did you use seam-gen to create your project skeleton?

The NPE is happening here in org.jboss.seam.persistence.HibernatePersistenceProvider:

private Session getSession(EntityManager entityManager)
   {
      Object delegate = entityManager.getDelegate();  //<-- NPE here!
      if ( delegate instanceof Session )
      {
         return (Session) delegate;
      }
      else
      {
         throw new NotHibernateException();
      }
   }

I'm not sure why this is happening but most likely you need to check your config files (e.g. components.xml, *-ds.xml, persistence.xml, etc.)

Remember, if you have to you can add debug breakpoints in Eclipse and step thru the Seam core code...

[indyjones2]

I got it....thanks so much for your help...

First, I was trying to set up my components.xml for the wrong version of Seam. I was following directions for 2.0 when I was running 2.1.2.

Second, and I probably missed this, but you must return a list of objects from your Hibernate session when populating the select items. Which makes sense, but I didn't fully get this at first....

For exammple....

This will NOT work...

function List<User> getUsers() {

     List<Users> userList = new ArrayList<User>();

     userList.add(new User("bob"));

     return userList;
}

This will work....

function List<User> getUsers() {

     Criteria criteria = hibernateSession.createCriteria(User.class);

     List userList = criteria.list();

     return userList;
}

Is that correct?

I know I can make a custom converter, but if you are going to use s:convertEntity, you need to make sure you use your Hibernate Session to create the list of objects....

Or am I missing something totally here?