trace and debug java class

Hi,
I write a java program XX.class.
I run it by /java -cp. XX
But I find this program disaapear suddenly in linux host .
There is no expection in the log file it produce .

How I can debug and find what probelm it is ???Any suggestion ..

I also use strace - p < java process> ....to check the process " ./java -cp. xx"
I only find there is something like " resourcec temporarily unavailable" but no idea any more .
The hd is not full . .....There is space toread /write in OS file system .

Any suggetion to debug this problem ????