Transacciones en EJB

[pyanqn]

El tema es el siguiente, en EJB 2.0/2.1 como se manejan las transacciones?

Si se trata de un EJB-CMP: las transacciones las gestiona el Contenedor EJB, bien, pues entonces de que manera se le indica al contenedor la forma en que debe hacerlo?, como se delimita una transacción?, se puede lograr el bloqueo de registros?

Estos temas me causan profundo interes, podrian ayudarme a responderme estas preguntas?

[pyanqn]

La pregunta es ahora mas precisa. Si utilizo transacciones demarcadas por el cliente, utilizo avax.transaction.UserTransaction. El tema es que mi codigo compila bien, pero cuando hago un begin transaccion todo falla, esto es lo que ocurre u mi codigo fuente:


private Properties p = new Properties();
private UserTransaction ut;
...
Context conttrans = new InitialContext(p);
p.put(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.int erfaces.NamingContextFactory");
p.put(Context.PROVIDER_URL,"jnp://srv_backup_xp:1099");
ut = (UserTransaction) conttrans.lookup("UserTransaction");

...
try{
ut.begin();
//Aqui la llamada a un metodo remoto...
ut.commit();
}
catch(Exception err){
System.out.println(err);
ut.rollback();
}

El error es el siguiente:

javax.transaction.SystemException: java.lang.RuntimeException: UT factory lookup failed
at org.jboss.tm.usertx.client.ClientUserTransaction.r ollback(ClientUserTransaction.java:216)
at abm_test_comercial_cliente.proveedores.FrmProveedo res.btnActualizar_actionPerformed(FrmProveedores.j ava:426)
at abm_test_comercial_cliente.proveedores.FrmProveedo res$FrmProveedores_btnActualizar_actionAdapter.act ionPerformed(FrmProveedores.java:695)
at javax.swing.AbstractButton.fireActionPerformed(Abs tractButton.java:1849)
at javax.swing.AbstractButton$Handler.actionPerformed (AbstractButton.java:2169)
at javax.swing.DefaultButtonModel.fireActionPerformed (DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultB uttonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseRe leased(BasicButtonListener.java:234)
at java.awt.Component.processMouseEvent(Component.jav a:5488)
at javax.swing.JComponent.processMouseEvent(JComponen t.java:3093)
at java.awt.Component.processEvent(Component.java:525 3)
at java.awt.Container.processEvent(Container.java:196 6)
at java.awt.Component.dispatchEventImpl(Component.jav a:3955)
at java.awt.Container.dispatchEventImpl(Container.jav a:2024)
at java.awt.Component.dispatchEvent(Component.java:38 03)
at java.awt.LightweightDispatcher.retargetMouseEvent( Container.java:4212)
at java.awt.LightweightDispatcher.processMouseEvent(C ontainer.java:3892)
at java.awt.LightweightDispatcher.dispatchEvent(Conta iner.java:3822)
at java.awt.Container.dispatchEventImpl(Container.jav a:2010)
at java.awt.Window.dispatchEventImpl(Window.java:1774 )
at java.awt.Component.dispatchEvent(Component.java:38 03)
at java.awt.EventQueue.dispatchEvent(EventQueue.java: 463)
at java.awt.EventDispatchThread.pumpOneEventForHierar chy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThre ad.java:110)

[pyanqn]

Pero si hago:
...
ut = (UserTransaction) conttrans.lookup("java:comp/UserTransaction");
...

El error es el siguiente:

javax.naming.NameNotFoundException: comp not bound
at org.jnp.server.NamingServer.getBinding(NamingServe r.java:529)
at org.jnp.server.NamingServer.getBinding(NamingServe r.java:537)
at org.jnp.server.NamingServer.getObject(NamingServer .java:543)
at org.jnp.server.NamingServer.lookup(NamingServer.ja va:267)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Native MethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastSe rverRef.java:294)
at sun.rmi.transport.Transport$1.run(Transport.java:1 53)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport. java:149)
at sun.rmi.transport.tcp.TCPTransport.handleMessages( TCPTransport.java:460)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandl er.run(TCPTransport.java:701)
at java.lang.Thread.run(Thread.java:595)
at sun.rmi.transport.StreamRemoteCall.exceptionReceiv edFromServer(StreamRemoteCall.java:247)
at sun.rmi.transport.StreamRemoteCall.executeCall(Str eamRemoteCall.java:223)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:1 26)
at org.jnp.server.NamingServer_Stub.lookup(Unknown Source)
at org.jnp.interfaces.NamingContext.lookup(NamingCont ext.java:625)
at org.jnp.interfaces.NamingContext.lookup(NamingCont ext.java:587)
at javax.naming.InitialContext.lookup(InitialContext. java:351)
at abm_test_comercial_cliente.principal.FrmMenu.<init >(FrmMenu.java:75)
at abm_test_comercial_cliente.principal.Application1. <init>(Application1.java:15)
at abm_test_comercial_cliente.principal.Application1$ 1.run(Application1.java:54)
at java.awt.event.InvocationEvent.dispatch(Invocation Event.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java: 461)
at java.awt.EventDispatchThread.pumpOneEventForHierar chy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarch y(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispa tchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThre ad.java:110)