[jboss-user] [Persistence, JBoss/CMP, Hibernate, Database] - EntityManager Injection, Null Pointer Exception. (Sorry...)

[repkin]

I wanted the entitymanager have been injected by the container. But after a lot of trial, I decided to ask the question.

Here is the situation,

My ear file structure:

  | surgeonfish.ear
  | |----surgeonfish-ds.xml
  | |----META-INF
  |       |----application.xml
  |       |----jboss-app.xml
  |       |----MANIFEST.MF
  | |----surgeonfish.jar
  |       |----com.beans...
  |       |----META-INF
  |             |----persistence.xml
  |             |----MANIFEST.MF
  | |----surgeonfish.war
  |       |----META-INF
  |             |----MANIFEST.MF
  |       |----WEB-INF
  |             |----classes
  |             |----lib
  |             |----web.xml
  | 
--------
surgeonfish-ds.xml:

  | <?xml version="1.0" encoding="UTF-8"?>
  | <datasources>
  | 	<local-tx-datasource>
  | 		<jndi-name>time_reporting_data_source</jndi-name>
  | 		<connection-url>jdbc:mysql://localhost:3306/timereporting</connection-url>
  | 		<driver-class>com.mysql.jdbc.Driver</driver-class>
  | 		<user-name>root</user-name>
  | 		<password>test</password>
  | 		<exception-sorter-class-name>org.jboss.resource.adapter.jdbc.vendor.MySQLExceptionSorter</exception-sorter-class-name>
  | 		<metadata>
  | 			 <type-mapping>mySQL</type-mapping>
  | 		</metadata>
  | 	</local-tx-datasource>
  | </datasources>
  | 
----------------
application.xml

  | <application>
  | 	<display-name>Surgeonfish</display-name>
  | 	<module>
  | 		<web>
  | 			<web-uri>surgeonfish.war</web-uri>
  | 			<context-root>/surgeonfish</context-root>
  | 		</web>
  | 	</module>
  | 	<module>
  | 		<ejb>surgeonfish.jar</ejb>
  | 	</module>
  | </application>
  | 
---------------
jboss-app.xml:

  | <jboss-app>
  | 	<module>
  | 		<service>surgeonfish-ds.xml</service>
  | 	</module>
  | 	<loader-repository>
  |  		surgeonfish:archive=surgeonfish.ear
  |  	</loader-repository>
  | </jboss-app>
  | 
--------------
persistence.xml:

  | <persistence>
  | 	<persistence-unit name="time_report_persistence_context">
  | 		<provider>org.hibernate.ejb.HibernatePersistence</provider>
  | 		<jta-data-source>java:/time_reporting_data_source</jta-data-source>
  | 		<jar-file>../surgeonfish.jar</jar-file>
  | 		<properties>
  | 			<property name="hibernate.hbm2ddl.auto" value="create-drop"/>
  | 			<property name="hibernate.show_sql" value="true"/>
  | 			<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
  | 			<property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.JBossTransactionManagerLookup"/>
  | 		</properties>
  | 	</persistence-unit>
  | </persistence>
  | 
----------------------
Here my test bean:

  | package com.xyz...;
  | 
  | 
  | import javax.ejb.Local;
  | import javax.ejb.Stateless;
  | import javax.persistence.EntityManager;
  | import javax.persistence.EntityManagerFactory;
  | import javax.persistence.Persistence;
  | import javax.persistence.PersistenceContext;
  | import org.apache.commons.logging.Log;
  | import org.apache.commons.logging.LogFactory;
  | 
  | @Stateless
  | @Local(value=PrStaffInterface.class)
  | public class PrStaffHome {
  | 
  | 	private static final Log log = LogFactory.getLog(PrStaffHome.class);
  | 
  | 	@PersistenceContext(unitName="time_report_persistence_context")
  | 	private EntityManager entityManager;
  | 
  | 	public PrStaff findById(Integer id) {
  | 		log.debug("getting PrStaff instance with id: " + id);
  | 		try {
  | 			/*
  | 			EntityManagerFactory emf = Persistence.createEntityManagerFactory("time_report_persistence_context");
  | 			EntityManager em = emf.createEntityManager();
  | 			PrStaff instance1 = em.find(PrStaff.class, id);
  | 			---this lines working without any error...---
  | 			*/
  | 			
  | 			PrStaff instance = entityManager.find(PrStaff.class, id);->I am taking null pointer exception here...
  | 			System.out.println("instance:"+instance);
  | 			log.debug("get successful");
  | 			return instance;
  | 		} catch (RuntimeException re) {
  | 			log.error("get failed", re);
  | 			throw re;
  | 		}
  | 	}
  | }
  | 
I cant find reason, why container is not injecting the entity manager. Of course I am missing something but I cant find. Thanks for your helps...

View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4158701#4158701

Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4158701