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# Changes in CORBA Features Between J2SE 1.4.x and 5.0

This release of the JavaTM 2 Platform Standard Edition (J2SE), contains the following enhancements to CORBA, Java IDL, and Java RMI-IIOP technology:

- Enhancement 4674929. Additional serviceability features for the Java SE ORB provide a logging framework based on J2SE 1.4 logging APIs. When an error is encountered and an OMG minor code is generated, this minor code will now be translated to a Java error code for error logging. The ORB will also include the standard minor codes as specified by the OMG specifications.

- Enhancement 4607440. Better performance of the default ORB in Java SE in high volume deployments, including better scalability and performance.

- Enhancement 4629589. Added Object Reference Template (ORT) to ORB. An Object Reference Template is an extension to portable interceptors that supports portable server activation frameworks, load balancing, fault tolerance, dynamic bridging, and other advanced features.

- Enhancement 4674944. Added on-the-wire interoperability. This includes identifying and incorporating any resolutions and/or updates from the OMG of any interoperability issues since CORBA 2.3.1 that affect on-the-wire interoperability for the J2EE Application Servers, and incorporating those resolutions into the Java SE ORB.

- When the J2SE 5.0 ORB marshals an `org.omg.CORBA.SystemException` response, it adds an `ExceptionDetailMessage` (i.e., a `ServiceContext with ServiceId 14`) as defined in:

          /**
           * CORBA formal/02-06-01: 13.7.1:
           * ExceptionDetailMessage identifies a CDR encapsulation of a wstring,
           * encoded using GIOP 1.2 with a TCS-W of UTF-16.  This service context
           * may be sent on Reply messages with a reply_status of SYSTEM_EXCEPTION
           * or USER_EXCEPTION. The usage of this service context is defined
           * by language mappings.
           *
           * IDL/Java: ptc/02-01-22: 1.15.2:
           * When a System Exception is marshaled, its GIOP Reply message shall
           * include an associated ExceptionDetailMessage service context. The
           * callee's stack trace is often very valuable debugging information but
           * may contain sensitive or unwanted information. The wstring within the
           * service context will therefore contain additional information relating
           * to the exception, for example the result of calling either
           * printStackTrace(PrintWriter) or getMessage() on the exception. When
           * unmarshaling a System Exception on the client side, the wstring from
           * any ExceptionDetailMessage service context shall become the Java error
           * message in the unmarshaled exception object.
           */

  When the J2SE 5.0 ORB unmarshals an `org.omg.CORBA.SystemException` response it constructs the `SystemException` with the contents of the `ExceptionDetailMessage` as the `message` argument to the `SystemException` constructor.

  NOTE: The content of the message may change. In J2SE 5.0, the message contains the server side stack trace. The following code example (note: all details may change) of a stack trace on the client side for an exception generated on the server-side (note the server-side stack trace in the exception's message):

      org.omg.CORBA.FREE_MEM: ----------BEGIN server-side stack trace----------
      org.omg.CORBA.FREE_MEM: idlIConnect  vmcid: 0x0  minor code: 0  completed: No
      	at corba.exceptiondetailsc.idlIServantConnect.raise_system_exception(idlIServantConnect.java:23)
      	at corba.exceptiondetailsc._idlIImplBase._invoke(_idlIImplBase.java:42)
      	at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatchToServant(CorbaServerRequestDispatcherImpl.java:647)
      	at com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatch(CorbaServerRequestDispatcherImpl.java:190)
      	at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequestRequest(CorbaMessageMediatorImpl.java:1653)
      	at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:1513)
      	at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleInput(CorbaMessageMediatorImpl.java:895)
      	at com.sun.corba.ee.impl.protocol.giopmsgheaders.RequestMessage_1_2.callback(RequestMessage_1_2.java:172)
      	at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaMessageMediatorImpl.java:668)
      	at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.dispatch(SocketOrChannelConnectionImpl.java:375)
      	at com.sun.corba.ee.impl.transport.SocketOrChannelConnectionImpl.read(SocketOrChannelConnectionImpl.java:284)
      	at com.sun.corba.ee.impl.transport.ReaderThreadImpl.doWork(ReaderThreadImpl.java:73)
      	at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:382)
      ----------END server-side stack trace----------  vmcid: 0x0  minor code: 0  completed: No
      	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
      	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
      	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
      	at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
      	at com.sun.corba.ee.impl.protocol.giopmsgheaders.MessageBase.getSystemException(MessageBase.java:791)
      	at com.sun.corba.ee.impl.protocol.giopmsgheaders.ReplyMessage_1_2.getSystemException(ReplyMessage_1_2.java:97)
      	at com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.getSystemExceptionReply(CorbaMessageMediatorImpl.java:546)
      	at com.sun.corba.ee.impl.protocol.CorbaClientRequestDispatcherImpl.processResponse(CorbaClientRequestDispatcherImpl.java:407)
      	at com.sun.corba.ee.impl.protocol.CorbaClientRequestDispatcherImpl.marshalingComplete(CorbaClientRequestDispatcherImpl.java:303)
      	at com.sun.corba.ee.impl.protocol.CorbaClientDelegateImpl.invoke(CorbaClientDelegateImpl.java:132)
      	at org.omg.CORBA.portable.ObjectImpl._invoke(ObjectImpl.java:457)
      	at corba.exceptiondetailsc._idlIStub.raise_system_exception(_idlIStub.java:20)
      	at corba.exceptiondetailsc.Client.main(Client.java:87)

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See Official Specifications for CORBA support in J2SE 5.0 for information on how Java IDL and Java RMI-IIOP comply with the CORBA Specifications.

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