Forms 10g   hang during working

hi...
i am currently working on forms 10g [32 Bit] Version 9.0.4.0.19 (Production).
but always form is working fine but some time it hang automatic .
how can i see the cause of hangup .
my os is win xp/sp2 .
I need it urgently ........
Thanks in advance
Ravi Ranjan

to begin check Java console output

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