20.21
java.lang.ThreadGroup
THE PACKAGE JAVA.LANG
20.21.31
public void uncaughtException(Thread t, Throwable e)
The general contract of
uncaughtException
 is that it is called whenever a thread
that belongs directly to this thread group dies because an exception was thrown in
that thread and not caught. The arguments are the
Thread
 object for the thread in
question and the
Throwable
 object that was thrown. The
uncaughtException
method may then take any appropriate action.
The call to
uncaughtException
 is performed by the thread that failed to
catch the exception, so
t
 is the current thread. The call to
uncaughtException
 is
the last action of the thread before it dies. If the call to
uncaughtException
 itself
results in an (uncaught) exception, this fact is ignored and the thread merely goes
on to die.
The method
uncaughtException
 defined by class
ThreadGroup
 takes one
of two actions. If this thread group has a parent thread group, then this method is
invoked for that parent thread group, with the same arguments. If this thread group
is the system thread group (which has no parent), then if the exception
e
 is not an
instance of
ThreadDeath
 ( 20.22), a stack trace ( 20.22.6) for
e
 is printed on the
error output stream that is the value of the field
System.err
 ( 20.18.3).
Subclasses of
ThreadGroup
 may override the
uncaughtException
 method.
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