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

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 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4170339#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...