Finding the thread ids instantiated at runtime

Hi,
I want to know if there is any way to know the threads that are instantiated at runtime from outside the class or package. To be more clear, I am building a module to enhance JSWAT (Open source java debugger ) to visualize the concurrent execution(monitor based) of multithreaded applications.
The user can load his multithreaded application in on the debugger UI using the menu File -> Load File. When the user clicks the run button, then threads would be created based on the user application (the multi threaded application that the user loads on to JSWAT).
I wanted to know if I can find the threads instantiated from the module that I am building ( outside the class of the multi threaded application) at run time. If so, how?
I also want to synchronize my visualization module with the JSWAT debugger. i.e. If the user sets a breakpoint in the debugger, then the visualization should also stop at that point.
Please advise me how to do these two tasks.
Thanks in advance. Eagerly awaiting your reply.
Thanks
Arun

You could arrange for a breakpoint to be set in java.lang.Thread's start() method, and get a call back when ever client's code hits this method ?
See this : http://java.sun.com/j2se/1.5.0/docs/guide/jpda/jdi/index.html
http://java.sun.com/j2se/1.5.0/docs/guide/jpda/jdi/com/sun/jdi/request/BreakpointRequest.html
http://java.sun.com/j2se/1.5.0/docs/guide/jpda/jdi/com/sun/jdi/Location.html
A tool that is built using the above api that gets a callback whenever java.util.Zip constructor is called may be of help.
http://blogs.sun.com/quinn/entry/tool_for_diagnosing_failed_glassfish
-Prashant

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http://en.wikipedia.org/wiki/A_Funny_Thing_Happened_on_the_Way_to_the_Forum ( {forum:id=29} )
http://forums.oracle.com/forums/help.jspa
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