I need to peek inside the JVM for thrown exceptions but how?

I have recently inherited 5 petabytes of Java code with other 86 quadrillion lines of code.
There is an exception being thrown somewhere while this is running (under tomcat in a big loop) and I need to find out exactly where.
The exception being thrown is not being displayed in any log file.
Because of the multi-threaded nature of the running code, I have difficulty tracing through it with the most advanced and technically superior Java IDE on the planet.
I was wondering if there is a way to attach some sort of monitor or debug tool to the running JVM and see if exceptions are being thrown anywhere at all during runtime and to capture them or log them - or at least see them.
I will not be able to discover this through the code. If there is any product or utility that will allow me to debug the problem, please let me know.
your help is greatly appreciated
PurpleTek

If an uncaught exception occurs, the jdk normally stops and prints out a stack trace on stderr, eg:
    Exception in thread "main" java.lang.NullPointerException
     at exception.blow(exception.java:11)
     at exception.main(exception.java:6)It sounds like this doesn't happen for you. If not, and the exception isn't displayed in any log file,
how do you know an exception occurred? Does your app just stop? Maybe the output shown above is
lost because of the way your app is started - ie, stderr is lost.
Can you just run your app under jdb? jdb automatically catches uncaught exceptions. You can also use the jdb 'catch' command to catch caught exceptions. If you catch 'caught' exceptions, you will probably find that your app generates lots of them. You might want to specify which exceptions to catch and which to ignore.
- jjh

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I need to peek inside the JVM for thrown exceptions but how?

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