0 Replies Latest reply on May 18, 2006 11:43 AM by davide pasquero

    "call by reference" between ejbs inside  the same  ear and "

    davide pasquero Newbie

      I want to make jndi lookup across ears that are isolated.

      I have made the following tests:




      1) I have configured all ears to be in isolated classloader spaces.

      file deploy/ear-deployer.xml :


      <!-- A flag indicating if ear deployments should have their own scoped
      class loader to isolate their classes from other deployments.
      -->
      true
      <!-- A flag indicating if the ear components should have in VM call
      optimization disabled.
      -->
      false


      I have deployed two ear , earA and earB ; the earA contains the ejbA and earB contains ejbB.

      The ejbA calls the ejbB in this way :

      Properties env =new Properties();
      env.setProperty(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory");
      env.setProperty(Context.PROVIDER_URL,"jnp://cst001.csi.it:1100");
      InitialContext ic = new InitialContext(env);
      Object objRef = ic.lookup(jndiMyStatless);
      home = (MyStatlessHome)PortableRemoteObject.narrow(objRef, MyStatlessHome.class);
      MyStatless clientStatless = (MyStatless)home.create();

      and I obtain the exception :

      2006-05-18 16:20:52,382 ERROR [org.jboss.ejb.plugins.LogInterceptor] TransactionRolledbackException in method:

      public abstract it.csi.oss.clusterejb.interfaces.MyStatless it.csi.oss.clusterejb.interfaces.MyStatlessHome.create

      () throws javax.ejb.CreateException,java.rmi.RemoteException, causedBy:
      javax.ejb.EJBException: Invalid invocation, check your deployment packaging, method=public abstract

      it.csi.oss.clusterejb.interfaces.MyStatless it.csi.oss.clusterejb.interfaces.MyStatlessHome.create() throws

      javax.ejb.CreateException,java.rmi.RemoteException
      at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invokeHome

      (StatelessSessionContainer.java:161)
      at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invokeHome

      (CachedConnectionInterceptor.java:212)
      at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invokeHome

      (StatelessSessionInstanceInterceptor.java:81)
      at org.jboss.ejb.plugins.AbstractInterceptor.invokeHome(AbstractInterceptor.java:90)
      at org.jboss.ejb.plugins.CallValidationInterceptor.invokeHome(CallValidationInterceptor.java:41)
      at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:109)
      at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:335)
      at org.jboss.ejb.plugins.TxInterceptorCMT.invokeHome(TxInterceptorCMT.java:146)
      at org.jboss.ejb.plugins.SecurityInterceptor.invokeHome(SecurityInterceptor.java:116)
      at org.jboss.ejb.plugins.LogInterceptor.invokeHome(LogInterceptor.java:121)
      at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invokeHome(ProxyFactoryFinderInterceptor.java:93)
      at org.jboss.ejb.SessionContainer.internalInvokeHome(SessionContainer.java:613)
      at org.jboss.ejb.Container.invoke(Container.java:894)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:324)
      at org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
      at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
      at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
      at org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:249)
      at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
      at org.jboss.invocation.local.LocalInvoker$MBeanServerAction.invoke(LocalInvoker.java:155)
      at org.jboss.invocation.local.LocalInvoker.invoke(LocalInvoker.java:104)
      ...
      ...



      2) I have configured all ears to be in isolated classloader spaces using call by value for remote interface.

      file deploy/ear-deployer.xml :


      <!-- A flag indicating if ear deployments should have their own scoped
      class loader to isolate their classes from other deployments.
      -->
      true
      <!-- A flag indicating if the ear components should have in VM call
      optimization disabled.
      -->
      true


      I have deployed two ear , earA and earB ; the earA contains the ejbA and earB contains ejbB.

      the ejbA calls the ejbB in the same way of point 1) :


      Properties env =new Properties();
      env.setProperty(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory");
      env.setProperty(Context.PROVIDER_URL,"jnp://cst001.csi.it:1100");
      InitialContext ic = new InitialContext(env);
      Object objRef = ic.lookup(jndiMyStatless);
      home = (MyStatlessHome)PortableRemoteObject.narrow(objRef, MyStatlessHome.class);
      MyStatless clientStatless = (MyStatless)home.create();

      in this way all works, but unfortunately also the calls between ejb inside the earA are made by value

      and this is very inefficent.


      3) I have configured all ears to be in isolated classloader spaces using call by value for remote interface.

      file deploy/ear-deployer.xml :


      <!-- A flag indicating if ear deployments should have their own scoped
      class loader to isolate their classes from other deployments.
      -->
      true
      <!-- A flag indicating if the ear components should have in VM call
      optimization disabled.
      -->
      true


      I have deployed two ear , earA and earB ; the earA contains the ejbA and earB contains ejbB.

      the ejbA calls the ejbB in the same way :

      Context initCtx = new InitialContext();
      Context ejbCtx = (Context)initCtx.lookup("java:comp/env/ejb");
      Object objRef = ejbCtx.lookup("MyStatless");
      home = (MyStatlessHome)PortableRemoteObject.narrow(objRef, MyStatlessHome.class);
      MyStatless clientStatless = (MyStatless)home.create();

      and I have configured ejb-ref in ejb.jar.xml :

      <ejb-ref >
      <ejb-ref-name>ejb/MyStatless</ejb-ref-name>
      <ejb-ref-type>Session</ejb-ref-type>
      it.csi.oss.clusterejb.interfaces.MyStatlessHome
      it.csi.oss.clusterejb.interfaces.MyStatless
      </ejb-ref>

      and in jboss.xml :

      <ejb-ref>
      <ejb-ref-name>ejb/MyStatless</ejb-ref-name>
      <jndi-name>jnp://cst001.csi.it:1100/ejb/MyStatlessClient</jndi-name>
      </ejb-ref>

      In this case I obtain following exception :


      2006-05-18 17:26:58,295 ERROR [org.jboss.ejb.plugins.LogInterceptor] RuntimeException in method: public abstract

      java.lang.String it.csi.oss.clusterejb.interfaces.MyStatlessClient.getNome(java.lang.String,int) throws

      java.rmi.RemoteException:
      java.lang.ClassCastException
      at com.sun.corba.se.internal.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:293)
      at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:134)
      at it.csi.oss.clusterejb.ejb.MyStatlessClient.getNome(MyStatlessClient.java:154)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
      at java.lang.reflect.Method.invoke(Method.java:324)
      at org.jboss.invocation.Invocation.performCall(Invocation.java:345)
      ..
      ..
      ..



      Questions :

      A) Is there a way to have "call by reference" between ejbs inside the same ear and "call by value" between ejbs across different ears ?

      B) Is there a solution of the point 3) ?



      thanks
      Davide Pasquero