Javax.servlet.ServletException: Unable to retrieve EntityManagerFactory for unitName "AJUDA!"

Será q alguem poderia me dar uma forca aí???

Estou contruindo uma aplicacao pra web usando netbeans, hibernate, postgres…crio a persistece Unit, as classes , tudo, e na hora de executar, a pagina index foncuiona:

JSP Page

List of Usuario
List of Tramitacao
List of Tabelas
List of Processo
List of Permissao
List of Perfil
List of Documento
List of Assunto
List of Acesso
JavaServer Faces Welcome Page


mas qdo clico pra exibir informacao de alguma das tabelas exemplo Usuario aparece esse erro:

HTTP Status 500 -


type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Unable to retrieve EntityManagerFactory for unitName MaisUmTestePU
javax.faces.webapp.FacesServlet.service(FacesServlet.java:256)
com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:73)
com.sun.enterprise.web.VirtualServerPipeline.invoke(VirtualServerPipeline.java:120)
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:231)
com.sun.enterprise.web.connector.grizzly.ProcessorTask.invokeAdapter(ProcessorTask.java:667)
com.sun.enterprise.web.connector.grizzly.ProcessorTask.processNonBlocked(ProcessorTask.java:574)
com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:844)
com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:287)
com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:212)
com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:252)
com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:75)

root cause

java.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName MaisUmTestePU
com.sun.enterprise.util.EntityManagerFactoryWrapper.getDelegate(EntityManagerFactoryWrapper.java:159)
com.sun.enterprise.util.EntityManagerFactoryWrapper.createEntityManager(EntityManagerFactoryWrapper.java:181)
negocio.UsuarioController.getEntityManager(UsuarioController.java:50)
negocio.UsuarioController.getItemCount(UsuarioController.java:217)
negocio.UsuarioController.getLastItem(UsuarioController.java:231)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:585)
javax.el.BeanELResolver.getValue(BeanELResolver.java:273)
javax.el.CompositeELResolver.getValue(CompositeELResolver.java:143)
com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:58)
com.sun.el.parser.AstValue.getValue(AstValue.java:117)
com.sun.el.parser.AstDeferredExpression.getValue(AstDeferredExpression.java:46)
com.sun.el.parser.AstCompositeExpression.getValue(AstCompositeExpression.java:51)
com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:192)
javax.faces.component.UIOutput.getValue(UIOutput.java:176)
com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:100)
com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:282)
com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:208)
javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:847)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:893)
javax.faces.render.Renderer.encodeChildren(Renderer.java:137)
javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:827)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:883)
javax.faces.component.UIComponent.encodeAll(UIComponent.java:889)
com.sun.faces.application.ViewHandlerImpl.doRenderView(ViewHandlerImpl.java:258)
com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:176)
com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:108)
com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:266)
com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:159)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:73)
com.sun.enterprise.web.VirtualServerPipeline.invoke(VirtualServerPipeline.java:120)
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:231)
com.sun.enterprise.web.connector.grizzly.ProcessorTask.invokeAdapter(ProcessorTask.java:667)
com.sun.enterprise.web.connector.grizzly.ProcessorTask.processNonBlocked(ProcessorTask.java:574)
com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:844)
com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:287)
com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:212)
com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:252)
com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:75)

note The full stack trace of the root cause is available in the Sun Java System Application Server Platform Edition 9.0 logs.