StackTrace question

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Rhino - 09 Nov 2005 16:48 GMT

Is there any way to print a stack trace if no exception has taken place?

It seems like there should be some simple way to write a stack trace to the
console any time you like, even if an exception has not occurred but I'm
blanking out when I try to think of how that could be done. I feel sure it
is possible and is easy so maybe my brain is just not firing on all
cylinders today....

Can anyone help?

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Rhino

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Robert Klemme - 09 Nov 2005 16:55 GMT

> Is there any way to print a stack trace if no exception has taken
> place?
[quoted text clipped - 6 lines]
>
> Can anyone help?

There's a fairly easy workaround:

package exceptions;

public class PrintStackTrace {

public static void main( String[] args ) {
test();
}

private static void test() {
Throwable t = new Throwable();
t.fillInStackTrace();
StackTraceElement[] stackTrace = t.getStackTrace();
for ( int i = 0; i < stackTrace.length; ++i ) {
StackTraceElement element = stackTrace[i];
System.out.println( element );
}
}
}

Kind regards

robert

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Ingo R. Homann - 09 Nov 2005 17:05 GMT

Hi,

> Throwable t = new Throwable();
> t.fillInStackTrace();
[quoted text clipped - 3 lines]
> System.out.println( element );
> }

Indeed, this can be done a little easier:

new Exception().printStackTrace();

Ciao,
Ingo

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Daniel Dyer - 09 Nov 2005 18:04 GMT

> Hi,
>
[quoted text clipped - 12 lines]
> Ciao,
> Ingo

And even more easily,

Thread.dumpStack();

Dan.

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Daniel Dyer
http://www.dandyer.co.uk

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Steve W. Jackson - 11 Nov 2005 19:25 GMT

> > Hi,
> >
[quoted text clipped - 18 lines]
>
> Dan.

Amusingly enough, Sun's source code shows that the Thread.dumpStack
method does the same thing, except that it gives the Exception's
constructor a String parameter saying "Stack Trace".

= Steve =

Signature

Steve W. Jackson
Montgomery, Alabama

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Oliver Wong - 11 Nov 2005 21:13 GMT

> Amusingly enough, Sun's source code shows that the Thread.dumpStack
> method does the same thing, except that it gives the Exception's
> constructor a String parameter saying "Stack Trace".

I imagine this happened after lots of developpers asked for a way to get
the stack trace and balked when Sun told them to just create a new Exception
("isn't that wasteful?!" they'd complain). So to placate them, Sun created
this new method and everyone lived happily ever after.

- Oliver

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Chris Uppal - 12 Nov 2005 11:10 GMT

Oliver Wong did not, in fact, write:

> > Amusingly enough, Sun's source code shows that the Thread.dumpStack
> > method does the same thing, except that it gives the Exception's
> > constructor a String parameter saying "Stack Trace".

That /is/ amusing.

But Oliver did write:

> I imagine this happened after lots of developpers asked for a way to
> get the stack trace and balked when Sun told them to just create a new
> Exception ("isn't that wasteful?!" they'd complain). So to placate them,
> Sun created this new method and everyone lived happily ever after.

Has the advantage too that the functionality is now available in the "right"
place. And Sun can, at a later date, move the actual implementation too.

-- chris

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Roedy Green - 09 Nov 2005 17:14 GMT

On Wed, 9 Nov 2005 11:48:04 -0500, "Rhino"
<no.offline.contact.please@nospam.com> wrote, quoted or indirectly
quoted someone who said :

>Is there any way to print a stack trace if no exception has taken place?

see http://mindprod.com/jgloss/trace.html

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Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

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