Threads listed using kill -3 does not contain all threads via ps -auxww

Hello
We are currently experiencing a problem running ServletExec (java Servlet container) where a process starts hogging the CPU. We end up having to restart the program.
As a Java developer, in these situations you tend to issue "kill -3 <pid>" commands to try to determine the rogue thread. The java VM traps this signal and outputs it's currently executing threads to system error.
In Linux, each java thread is implemented as a process. The rogue process I mentioned above does NOT appear in the "kill -3" stack trace which is very strange.
So I ran a very simple java program that starts a thread and continuously sleeps for 2 seconds and then prints out "Sleeping..". If I issue kill -3 commands against this program and compare against a listing of the threads using ps -auxww the latter contains more 2 threads.
So the "problem" is not a ServletExec issue.
Am I correct in my assumption that all the processes seen using ps -auxww should be visible in the Java stack trace? If not, how can I find out what the rogue java process is doing?
Many thanks for any info.
Environment:
Red Hat release          ES 2.1
kernel version          2.4.9-e.62smp
hardware               hp ProLiant DL360 G3
java               j2sdk1.4.2_09
ServletExec               4.1.1 patch 27

In Linux, each java thread is implemented as a process.It was not exactly true even with the elder versions of Linux, let alone the newer ones. With some versions however threads showed up as processes in the output of "ps" or some other diagnostic tool.
In good old days, the traditional fork() Unix system call, which copies the running process along with its memory state and runs both copies as separate processes (with the return value of the said system call differentiating between the parent and the child process) had some flags, Linux-extension ones, to fine-tune what is exactly copied and shared among the processes. (File handles are shared for example by default). One possibity was to tell the new process to share the memory with the old one - threading was solved (hacked) this way but, as said, it was withj the elder Linux versions.

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