[jboss-user] [JBoss Seam] - Re: <s:convertEntity /> - how to make it works?

[oblivion1200]

During entering the page containing <s:convertEntity /> I get

2007-08-06 13:54:51,816 ERROR [STDERR] 2007-08-06 13:54:51 com.sun.facelets.FaceletViewHandler handleRenderException
  | SEVERE: Error Rendering View[/createAuction.xhtml]
  | java.lang.NullPointerException
  | 	at org.jboss.seam.persistence.HibernatePersistenceProvider.getSession(HibernatePersistenceProvider.java:157)
  | 	at org.jboss.seam.persistence.HibernatePersistenceProvider.getId(HibernatePersistenceProvider.java:114)
  | 	at org.jboss.seam.framework.EntityIdentifier.<init>(EntityIdentifier.java:15)
  | 	at org.jboss.seam.ui.converter.EntityConverterStore.put(EntityConverterStore.java:60)
  | 	at org.jboss.seam.ui.converter.EntityConverter.getAsString(EntityConverter.java:69)
  | 	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 org.jboss.seam.ui.util.cdk.RendererBase.renderChild(RendererBase.java:190)
  | 	at org.jboss.seam.ui.util.cdk.RendererBase.renderChildren(RendererBase.java:166)
  | 	at org.jboss.seam.ui.renderkit.ValidateAllRendererBase.doEncodeChildren(ValidateAllRendererBase.java:33)
  | 	at org.jboss.seam.ui.util.cdk.RendererBase.encodeChildren(RendererBase.java:92)
  | 	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:812)
  | 	at org.jboss.seam.ui.util.cdk.RendererBase.renderChild(RendererBase.java:186)
  | 	at org.jboss.seam.ui.util.cdk.RendererBase.renderChildren(RendererBase.java:166)
  | 	at org.jboss.seam.ui.renderkit.DecorateRendererBase.doEncodeChildren(DecorateRendererBase.java:94)
  | 	at org.jboss.seam.ui.util.cdk.RendererBase.encodeChildren(RendererBase.java:92)
  | 	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:812)
  | 	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:886)
  | 	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 org.ajax4jsf.framework.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:108)
  | 	at org.ajax4jsf.framework.ajax.AjaxViewHandler.renderView(AjaxViewHandler.java:233)
  | 	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$FilterChainImpl.doFilter(SeamFilter.java:83)
  | 	at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:87)
  | 	at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
  | 	at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:63)
  | 	at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
  | 	at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:46)
  | 	at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
  | 	at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:127)
  | 	at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:277)
  | 	at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:40)
  | 	at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
  | 	at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:63)
  | 	at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
  | 	at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:140)
  | 	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.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433)
  | 	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)

my html code is:
			<h:selectOneMenu value="#{am.newAuction.category}" required="true">
  |   					<s:selectItems value="#{categoryList}" var="item" label="#{item.name}" 
  |   					noSelectionLabel="Please Select..."/>
  |   					<s:convertEntity />
  | 			</h:selectOneMenu>

without <s:convertEntity /> I get no exception

		<persistence:managed-persistence-context name="em" auto-create="true" 
  | persistence-unit-jndi-name="java:/SeamAuctionEntityManagerFactory"/>	

    @In(create=true)
  |     private EntityManager em;
  | 

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