Program hangs, can't get thread dump

Hello
I have a Java program which sometimes works OK untill the very end, but sometimes just hangs in a random moment and doesn't react to Ctrl+C or Ctrl+Break. Process doesn't use CPU, so I guess it isn't something like infinite loop (I actually cannot think of places in my program where this kind of loop may occur). I tried to get thread dump to see if there are any deadlocks, but Ctrl+Break doesn't work and jstack doesn't work also (I've read that there is -F option, but it isn't available on Windows). Also I tried to connect to a process with Java Visual VM - doesn't help too (just says 'Connecting...' forever).
What else can I do to find out what's going on in my programm and fix it?
I tried to run it with JDK 1.6.0_07 and 1.6.0_16. I'm using Windows Vista Enterprise SP1, 64-bit.
Thanks in advance, Yulia.
Edited by: Yulia_Dubinina on Oct 26, 2009 11:58 PM
Edited by: Yulia_Dubinina on Oct 27, 2009 12:13 AM

Yulia_Dubinina wrote:
Yesterday I tried to start my program, connect with Java Visual VM to it and see how threads visualisation will look like in a moment when program hangs. My programm died after about 50 min and all info which I was able to see was about this period of time (e.g. a timeline diagram stopped changing and the last time mark was 49:23), but Java Visual VM was still connected to a process. I tried to press Thread Dump button, it worked, but there was nothing 'criminal' on the dump it provided. So I guess maybe it's not actual thread dump, it's something that Java Visual VM was able to get before process hanged.
I don't have much experience in resolving this kind of problems, so any advices will be great appreciated.
Edited by: Yulia_Dubinina on Oct 27, 2009 2:14 PMTurn on verbose GC and see if you got lots and lots of full GC when the freeze happens. A full GC can take several minutes if you have a bad configuration (where e.g. memory has been paged out to disk)

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