Is there such a thing as a JVM monitor...

[Edward A Thompson]

(open source) that will let me view how many insatnces of which
objects are currently instantiated in the JVM?

Or something similiar for the web container TomCat?

 

[Michael Borgwardt]

(open source) that will let me view how many insatnces of which
objects are currently instantiated in the JVM?

What you're looking for is called a "profiler", what you want to
do is "heap profiling".

Currently, the only open source profiler that does heap profiling seems to be
this one: http://jmechanic.sourceforge.net/

But it my be unstable and difficult to use at version 0.5...

 

[Robert Olofsson]

Michael Borgwardt ([email protected]) wrote:
: Edward A Thompson wrote:
: > (open source) that will let me view how many insatnces of which
: > objects are currently instantiated in the JVM?

: What you're looking for is called a "profiler", what you want to
: do is "heap profiling".
: Currently, the only open source profiler that does heap profiling seems to be
: this one: http://jmechanic.sourceforge.net/

Not entirely correct.
HProf is included in any modern jdk (1.2.2+?) its not open source, but
its gratis and the source is available.
My profiler, JMP, is open source and can be found at:
http://www.khelekore.org/jmp

There are others like:
eclipsecolorer http://eclipsecolorer.sourceforge.net/index_profiler.html

You also have a couple of commercial ones like optimizeit, jprobe,
jprofiler.

Have fun
/robo

 

[Michael Borgwardt]

: Currently, the only open source profiler that does heap profiling seems to be
: this one: http://jmechanic.sourceforge.net/

Not entirely correct.
HProf is included in any modern jdk (1.2.2+?) its not open source, but
its gratis and the source is available.

OK, it actually fulfills the OP's (minimal) requirements, but it's a
bit spartanic.

My profiler, JMP, is open source and can be found at:
http://www.khelekore.org/jmp

First time I've heard about it. I'll give it a try sometimes.

There are others like:
eclipsecolorer http://eclipsecolorer.sourceforge.net/index_profiler.html

It doesn't do heap profiling.

You also have a couple of commercial ones like optimizeit, jprobe,
jprofiler.

Of course.