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# Communication Exceptions (12000 - 12003)

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`CommunicationException` is a run-time exception that wraps all RMI, CORBA, or input and output exceptions that occur.

Format

    EXCEPTION [TOPLINK – error code]: Exception name
    EXCEPTION DESCRIPTION: Message

Communication Exception

    EXCEPTION [TOPLINK – 12000]: oracle.toplink.exceptions.CommunicationException
    EXCEPTION DESCRIPTION: Error Sending connection service to myService.

12000: ERROR_SENDING_CONNECTION_SERVICE
  Cause: Failed to add a connection to `CacheSynchronizationManager` or `RemoteCommandManager`.
  Action: See the generated exception for the root cause.

12001: UNABLE_TO_CONNECT
  Cause: `CacheSynronizationManager` failed to connect to the specified service.
  Action: See the generated exception for the root cause.

12002: UNABLE_TO_PROPAGATE_CHANGES
  Cause: `CacheSynronizationManager` failed to propagate changes to the specified service.
  Action: See the generated exception for the root cause.

12003: ERROR_IN_INVOCATION
  Cause: Error invoking a remote call.
  Action: See the generated exception for the root cause.