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