Re: [eclipselink-users] Nullpointer Exception trying to execute eclipsel

[christopher delahunt <christopher.delahunt@xxxxxxxxxx>]

Hello,

This error is odd because it is complaining that it cannot load 
*javax/resource/ResourceException*, implying your classpath is 
incomplete.  This error occurs when trying to load the driver class to 
login, so chance are your driver jar is incomplete or has external 
dependencies that are not available causing this exception.  I am not 
familar with the org.firebirdsql.jdbc.FBDriver, so you might want to try 
a different driver/database combination and see if that works with the 
application.
Best Regards,
Chris

Arcangel wrote:
> Hello.
>
> I'm having some troubles when I tried to use eclipselink-2.0.0 with eclipse
> WTP.
>
> Eclipselink is sending to me this exception:
>
> Exception in thread "main" java.lang.NoClassDefFoundError:
> javax/resource/ResourceException
> 	at java.lang.Class.forName0(Native Method)
> 	at java.lang.Class.forName(Class.java:247)
> 	at
> org.eclipse.persistence.internal.security.PrivilegedAccessHelper.getClassForName(PrivilegedAccessHelper.java:88)
> 	at
> org.eclipse.persistence.sessions.DefaultConnector.loadDriverClass(DefaultConnector.java:253)
> 	at
> org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:85)
> 	at
> org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162)
> 	at
> org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:584)
> 	at
> org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:228)
> 	at
> org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:368)
> 	at
> org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:151)
> 	at
> org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:207)
> 	at
> org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:195)
> 	at Persona.guardar(Persona.java:63)
> 	at Persona.main(Persona.java:89)
> Caused by: java.lang.ClassNotFoundException:
> javax.resource.ResourceException
> 	at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
> 	at java.security.AccessController.doPrivileged(Native Method)
> 	at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
> 	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
> 	at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
>
> I create a simple JPA project and add these jars to the build path:
> eclipselink-2.0.0.jar
> javax.persistence-2.0.0.jar
> jaybird-2.1.6jdk16.jar
>
> My persistence.xml is this:
>
> <?xml version="1.0" encoding="UTF-8" ?>
> <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_2_0.xsd";
>         version="2.0" xmlns="http://java.sun.com/xml/ns/persistence";>
> 	<persistence-unit name="prueba_eclipselink"
> transaction-type="RESOURCE_LOCAL">
> 	<class>Persona</class>
> 	<properties>
> 			<property name="javax.persistence.jdbc.driver"
> value="org.firebirdsql.jdbc.FBDriver" />
> 			<property name="javax.persistence.jdbc.url"
> 				value="jdbc:firebirdsql:localhost/3050:/var/dbs/prueba_firebird.fdb" />
> 			<property name="javax.persistence.jdbc.user" value="sysdba" />
> 			<property name="javax.persistence.jdbc.password" value="masterkey" />
> 			<property name="eclipselink.ddl-generation" value="create-tables" />
> 			<property name="eclipselink.logging.level" value="ALL" />
> 		</properties>
> 	</persistence-unit>
> </persistence>
>
> My test class is this:
>
> import java.io.Serializable;
> import java.lang.String;
> import javax.persistence.*;
>
> /**
>  * Entity implementation class for Entity: Persona
>  *
>  */
> @Entity
> public class Persona implements Serializable {
>
> 	@Id
> 	@GeneratedValue
> 	private int id;
> 	private String nombre;
> 	private String direccion;
> 	private static final long serialVersionUID = 1L;
> 	@Transient
> 	protected EntityManager em;
> 	@Transient
> 	protected static final String PERSISTENCE_UNIT_NAME = "prueba_eclipselink";
> 	@Transient
> 	protected static EntityManagerFactory factory = Persistence
> 	.createEntityManagerFactory(PERSISTENCE_UNIT_NAME);
>
>
> 	public Persona() {
> 		super();
> 	}   
> 	public int getId() {
> 		return this.id;
> 	}
>
> 	public void setId(int id) {
> 		this.id = id;
> 	}   
> 	public String getNombre() {
> 		return this.nombre;
> 	}
>
> 	public void setNombre(String nombre) {
> 		this.nombre = nombre;
> 	}   
> 	public String getDireccion() {
> 		return this.direccion;
> 	}
>
> 	public void setDireccion(String direccion) {
> 		this.direccion = direccion;
> 	}
>
> 	public Persona(int id, String nombre, String direccion) {
> 		super();
> 		this.id = id;
> 		this.nombre = nombre;
> 		this.direccion = direccion;
> 	}
> 	public boolean guardar(){
> 		boolean res = false;
> 		try {
> 			em = factory.createEntityManager();
> 			em.getTransaction().begin();
> 			if (id == 0) {
> 				em.persist(this);
> 			}
> 			else {
> 				em.merge(this);
> 			}
> 			em.getTransaction().commit();
> 			res = true;
> 		}
> 		catch (Exception e) {
> 			e.printStackTrace();
> 			res = false;
> 		}
> 		finally{
> 			if(em !=null){
> 				em.close();
> 			}
> 		}
> 		return res;
> 	}
>         public static void main(String[] args) {
> 		Persona persona = new Persona();
> 		persona.setNombre("jose");
> 		persona.setDireccion("rio gambia");
> 		assertTrue(persona.guardar());
> 	}
> }
>
>