This exception may be thrown on any method for which Activity context is
accessed and indicates that ongoing work within the Activity is not
possible. This may be because the Activity has been instructed to complete
with CompletionStatusFailOnly or has ended as a result of a timeout. This
exception will be propagated across ORB boundaries via an
org.omg.CORBA.ACTIVITY_COMPLETED system exception. An application should
handle this error by attempting to complete the Activity.

This exception is thrown by a container if Activity context is not received
on a method for which Activity context is mandatory. This exception
indicates a deployment or application configuration error. This exception
will be propagated across ORB boundaries via an
org.omg.CORBA.ACTIVITY_REQUIRED system exception.

This exception may be thrown on any method for which Activity context
is accessed and indicates that the attempted invocation or the Activity
context associated with the attempted invocation is incompatible with
the Activity's current state. It may also be thrown by a container if
Activity context is received on a method for which Activity context is
forbidden. This exception will be propagated across J2EE Activity Service
ORB boundaries via an org.omg.CORBA.INVALID_ACTIVITY system exception.
An application should handle this error by attempting to complete the
Activity.