[jboss-user] [EJB 3.0] - Re: Another NULL Pointer Exception on Entity Manager =/
Tchello
do-not-reply at jboss.com
Thu Feb 12 12:29:50 EST 2009
Ok, as you sad: i createad a new project respecting all those rules (i hope).
Lets see:
JSP file:
| <%@ page language="java"
| isThreadSafe="false"
| import="javax.naming.*"
| import="javax.rmi.PortableRemoteObject"
| import="org.interfaces.*"
| import="org.classes.*"
| %>
| <html>
| <head>
| <title>JSP Page</title>
| </head>
| <body>
| <%
| ManagerRemote mn = null;
| InitialContext ic = null;
|
| try {
| out.print("Starting...<BR>");
| ic = new InitialContext();
|
| out.print("Initial instanced<BR>");
| mn = (ManagerRemote) ic.lookup("Manager/ManagerBean/remote");
| out.print("Manager obteined<BR>");
|
| out.print("Salvando...<BR>");
| mn.save();
| out.print("Cadastro salvo com sucesso!<BR><BR>");
| out.print("Pesquisando...<BR><BR>");
|
| out.print("<BR><BR>"+mn.getById(1)+"<BR><BR>");
|
|
| } catch(Exception e){
| out.println("ERRO <BR>");
| out.println(e.getMessage());
| }
| %>
| </body>
| </html>
|
ManagerBean:
|
| package org.classes;
|
| import javax.ejb.Stateful;
| import javax.persistence.EntityManager;
| import javax.persistence.PersistenceContext;
| import org.interfaces.*;
|
| @Stateful
| public class ManagerBean implements ManagerLocal,ManagerRemote{
|
| //## Atributes
| @PersistenceContext(unitName="MyPostgresDS")
| private EntityManager em;
|
| //##Methods
| //##-----------------------------------------------------------------
| public ManagerBean() {
| }
| //##-----------------------------------------------------------------
| public void save(){
| Cadastro cd = new Cadastro();
| cd.setId(1);
| cd.setNome("Marcelo");
|
| em.getTransaction().begin();
| em.persist(cd);
| em.getTransaction().commit();
| }
| //##-----------------------------------------------------------------
| public String getById(int id){
| em.getTransaction().begin(); //is it really necessary?
| Cadastro found = em.find(Cadastro.class,id);
| em.getTransaction().commit(); //is it really necessary?
|
| return(found.getNome());
| }
| //##-----------------------------------------------------------------
| }
|
Entity:
|
| package org.classes;
|
| import java.io.Serializable;
| import javax.persistence.Column;
| import javax.persistence.Entity;
| import javax.persistence.Id;
| import javax.persistence.Table;
|
|
| @Entity
| @Table(name="cadastro")
| public class Cadastro implements Serializable{
|
| //## Atributes
| private Integer id;
| private String nome;
|
| //##Methods
| //##-----------------------------------------------------------------
| public Cadastro() {
| }
| //##-----------------------------------------------------------------
| @Id
| @Column(name="id")
| public Integer getId() {
| return id;
| }
| //##-----------------------------------------------------------------
| @Column(name="Nome")
| public String getNome() {
| return nome;
| }
| //##-----------------------------------------------------------------
| public void setNome(String nome) {
| this.nome = nome;
| }
| //##-----------------------------------------------------------------
| public void setId(Integer id) {
| this.id = id;
| }
| //##-----------------------------------------------------------------
| }
|
persistence.xml
| <?xml version="1.0" encoding="UTF-8"?>
|
| <persistence>
| <persistence-unit name="myunit">
| <jta-data-source>java:MyPostgreDS</jta-data-source>
| <class>org.classes.Cadastro</class>
| <properties>
| <propertie name="org.hibernate.hdm2ddl" value="create-table">
| </properties>
| </persistence-unit>
| </persistence>
|
Data Source: (also added to postgres-ds.xml on jboss deploy folder)
| <datasources>
| <local-tx-datasource>
| <jndi-name>MyPostgreDS</jndi-name>
| <connection-url>jdbc:postgresql://192.168.0.200:5432/netejb</connection-url>
| <driver-class>org.postgresql.Driver</driver-class>
| <user-name>postgres</user-name>
| <password>postgres</password>
| </local-tx-datasource>
| </datasources>
|
Now i'm getting the following error:
anonymous wrote :
| Manager not bound
|
It happens when i try to instance my ManagerBean (remote) in jsp file.
Am i at the right way now?
i apologize about my noob skills >.<
Thank you!
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