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runFinalizersOnExit

Posted on 1998-01-19
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Last Modified: 2012-06-27
Is there anyway to hardwire runFinalizersOnExit
into a class?

Can you make an object that absolutely will run its
its finalize method?  If you can't insure it how do
you note it in the javadoc page.  Is there a standard
BEWARE gif I haven't seen?  Is there a compiler way to
change the default of not running finalizers.  (Does
java have a "pragma" way of controlling the compiler?)
Oh, just questions questions questions.

Comments only for a few days unless your believe your
answer is truly a definitive.
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Question by:hank1
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5 Comments
 

Expert Comment

by:rjg2000
ID: 1232383
To the best of my knowledge.

not as such, you can call Runtime.runFinalizersOnExit(true) to force the VM to run the finalizers before collecting the object but there is not guarentee that this will be done immediately.  (It will be done at the time the object is actually freed which may be alot later than when thre reference was lost.  I belive you can force unreference objects to run their finalizers by calling Runtime.runFinalization().  There is no way to force this behaviour without user code.

The way I would approach this is if the finalizer is so important then I would explictly call your own finaliztion method when you throw the object away.  (you imply that you really need the locked resource back and this thus guarantees it).

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Author Comment

by:hank1
ID: 1232384
Running a program normally allows runFinalizersOnExit(true)
to run the finalize methods.  'break'ing out of a program
defeats it.  Anyway to 'capture' this
abnormal program abort and let runFinalizersOnExit()
do it thing?
0
 

Expert Comment

by:rjg2000
ID: 1232385
Not to the best of my knowledge,

If it is really important to do this clean up you will have to do
the house keeping yourself.

If you are talking about breaking out if a program by an execption you can catch this using

try
{
      ..program
}
catch(Throwable t)
{
      cleanUp();
}
}
0
 
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Author Comment

by:hank1
ID: 1232386
Ah yes, so right.  Just capture the exception ...  Dahhhh
Thanks.  Plop an answer in here and I'll give rjg2000 the points
PS - You ready for 1999 - 2000 xsistion ( which is still the
20th century by-the-way)
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Accepted Solution

by:
rjg2000 earned 150 total points
ID: 1232387
Here it is,

Yes, I'm year 2000 complient but only cos all my normal aliases are already used.  Which is strange cos my name and normal username are quite unusual.
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