Entity Mangar esta vindo nulo Jsf 2.0 e JPA

Front-end
#1

Estou tomando esse erro como não sei muito JPA poderiam me ajudar, desde já muito obrigado

SEVERE: java.lang.NullPointerException
javax.faces.el.EvaluationException: java.lang.NullPointerException
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:9
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:9
at javax.faces.component.UICommand.broadcast(UICommand.java:311)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:781)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1246)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:77)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:30
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:306)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:10
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:55
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:11
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:379)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:259)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:281)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at br.com.universidade.repositorio.CursoRepositorio.adciona(CursoRepositorio.java:23)
at br.com.universidade.mb.CursoBean.adciona(CursoBean.java:21)
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.apache.el.parser.AstValue.invoke(AstValue.java:262)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:27
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:102)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:84)
… 23 more
09/12/2010 15:19:53 com.sun.faces.lifecycle.InvokeApplicationPhase execute
WARNING: #{cursoBean.adciona}: java.lang.NullPointerException
javax.faces.FacesException: #{cursoBean.adciona}: java.lang.NullPointerException
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:114)
at javax.faces.component.UICommand.broadcast(UICommand.java:311)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:781)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1246)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:77)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:30
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:306)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:10
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:55
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:11
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:379)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:259)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:281)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: javax.faces.el.EvaluationException: java.lang.NullPointerException
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:9
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:9
… 22 more
Caused by: java.lang.NullPointerException
at br.com.universidade.repositorio.CursoRepositorio.adciona(CursoRepositorio.java:23)
at br.com.universidade.mb.CursoBean.adciona(CursoBean.java:21)
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.apache.el.parser.AstValue.invoke(AstValue.java:262)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:27
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:102)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:84)
… 23 more
09/12/2010 15:19:53 org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [Faces Config] in context with path [/universidade] threw exception [java.lang.NullPointerException] with root cause
java.lang.NullPointerException
at br.com.universidade.repositorio.CursoRepositorio.adciona(CursoRepositorio.java:23)
at br.com.universidade.mb.CursoBean.adciona(CursoBean.java:21)
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.apache.el.parser.AstValue.invoke(AstValue.java:262)
at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:27
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:102)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:84)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:9
at javax.faces.component.UICommand.broadcast(UICommand.java:311)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:781)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1246)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:77)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:114)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:30
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:306)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:10
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:55
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:11
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:379)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:259)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:281)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

MB

package br.com.universidade.mb;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.ManagedProperty;
import javax.persistence.EntityManager;

import br.com.universidade.entidades.Curso;
import br.com.universidade.repositorio.CursoRepositorio;

@ManagedBean
public class CursoBean {

	@ManagedProperty(value="#{entityManager}")
	private EntityManager entityManager;
	
	private Curso curso = new Curso();

	
	public void adciona(){
		CursoRepositorio cursoRepositorio = new CursoRepositorio(entityManager);
		cursoRepositorio.adciona(this.curso);
		this.curso = new Curso();
	
	
	}
	
	public EntityManager getEntityManager() {
		return entityManager;
	}

	public void setEntityManager(EntityManager entityManager) {
		this.entityManager = entityManager;
	}

	public Curso getCurso() {
		return curso;
	}

	public void setCurso(Curso curso) {
		this.curso = curso;
	}
	
	
	
	
}

Repositório

package br.com.universidade.repositorio;

import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.Query;

import br.com.universidade.entidades.Curso;


public class CursoRepositorio {

    
	private EntityManager entityManager;
	
	public CursoRepositorio (EntityManager entityManager){
		this.entityManager = entityManager;
	}
	
	public void adciona(Curso curso){
		
		this.entityManager.persist(curso);
		this.entityManager.flush();
	}
	
	@SuppressWarnings("unchecked")
	public List<Curso> getCurso(){
		Query query = this.entityManager.createQuery("SELECT C FROM CURSO AS C");
		return query.getResultList();
	}


	
}

JPAFilter

package br.com.universidade.filter;

import java.io.IOException;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;

@WebFilter(servletNames={"Faces Servlet"})
public class JPAFilter implements Filter{
    private EntityManagerFactory factory;
    
    private EntityManager entityManager;
    
    @Override
	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		    	
    	entityManager = this.factory.createEntityManager();
    	request.setAttribute("entityManager", entityManager);
    	entityManager.getTransaction().begin();
    	
    	chain.doFilter(request, response);
    	try{
    		
    		entityManager.getTransaction().commit();
    	}catch(Exception e){
    		entityManager.getTransaction().rollback();
    	}finally{
    		entityManager.close();
    	}
	}
    
	@Override
	public void init(FilterConfig config) throws ServletException {
		this.factory = Persistence.createEntityManagerFactory("universidade");
		
	}

    
    @Override
	public void destroy() {
		this.factory.close();
		
	}

	


	
}
#2