[jboss-user] [JBoss Tools (users)] - NullPointer on Entitymanager using Seam Project

[Smoeker]

hi there,

i am new to Jboss - development with seam and have problems with my first Database - project : 

I generated a SeamWebProject by Jboss Tools for Eclipse and ReverseEngineered a Database into the Seam - Project, e.g. the Class ArticleHome  : 

/ Generated 13.08.2008 15:14:13 by Hibernate Tools 3.2.2.GA

import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Home object for domain model class Article.
 * @see de.medint.webshop.Article
 * @author Hibernate Tools
 */
@Stateless
public class ArticleHome {

	private static final Log log = LogFactory.getLog(ArticleHome.class);

	@PersistenceContext
	private EntityManager entityManager;

	public void persist(Article transientInstance) {
		log.debug("persisting Article instance");
		try {
			entityManager.persist(transientInstance);
			log.debug("persist successful");
		} catch (RuntimeException re) {
			log.error("persist failed", re);
			throw re;
		}
	}
}

The components.xml looks as follows : 

<?xml version="1.0" encoding="UTF-8"?>
<components xmlns="http://jboss.com/products/seam/components"
            xmlns:core="http://jboss.com/products/seam/core"
            xmlns:persistence="http://jboss.com/products/seam/persistence"
            xmlns:drools="http://jboss.com/products/seam/drools"
            xmlns:bpm="http://jboss.com/products/seam/bpm"
            xmlns:security="http://jboss.com/products/seam/security"
            xmlns:mail="http://jboss.com/products/seam/mail"
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
            xsi:schemaLocation=
                "http://jboss.com/products/seam/core http://jboss.com/products/seam/core-2.0.xsd 
                 http://jboss.com/products/seam/persistence http://jboss.com/products/seam/persistence-2.0.xsd 
                 http://jboss.com/products/seam/drools http://jboss.com/products/seam/drools-2.0.xsd
                 http://jboss.com/products/seam/bpm http://jboss.com/products/seam/bpm-2.0.xsd
                 http://jboss.com/products/seam/security http://jboss.com/products/seam/security-2.0.xsd
                 http://jboss.com/products/seam/mail http://jboss.com/products/seam/mail-2.0.xsd
                 http://jboss.com/products/seam/components http://jboss.com/products/seam/components-2.0.xsd">

   <core:init debug="true" jndi-pattern="@jndiPattern@"/>
     
   <core:manager concurrent-request-timeout="500" 
                 conversation-timeout="120000" 
                 conversation-id-parameter="cid"
                 parent-conversation-id-parameter="pid"/>
    
   <persistence:managed-persistence-context name="entityManager"
                                     auto-create="true"
                      persistence-unit-jndi-name="java:/webshopEntityManagerFactory"/>                          

   <drools:rule-base name="securityRules">
       <drools:rule-files>
           /security.drl
       </drools:rule-files>
   </drools:rule-base>

   <security:identity security-rules="#{securityRules}" authenticate-method="#{authenticator.authenticate}" remember-me="true"/>
   
   
       
   
   
       
   
   
   <mail:mail-session host="localhost" port="2525" username="test" password="test" />
        
   <!-- For use with jBPM pageflow or process management -->
   <!--  
   <bpm:jbpm>
      <bpm:process-definitions></bpm:process-definitions>
      <bpm:pageflow-definitions></bpm:pageflow-definitions>
   </bpm:jbpm>
   -->
      



Heres the persistence.xml : 

<?xml version="1.0" encoding="UTF-8"?>
<!-- Persistence deployment descriptor for dev profile -->
<persistence xmlns="http://java.sun.com/xml/ns/persistence" 
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" 
             version="1.0">
             
   <persistence-unit name="webshop">
      org.hibernate.ejb.HibernatePersistence
      <jta-data-source>java:/webshopDatasource</jta-data-source>
      
         
         
         
         
         
         
      
   </persistence-unit>
    



Using a function of ArticleHome i get a NullPointer on Entitymanager...

whats wrong - can somebody help?


thnx





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