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Adobe lifecycle 8.2 keeps crashing or become unresponsive

Adobe lifecycle 8.2 keeps crashing or become unresponsive.
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Steven Harris
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What steps cause the freeze and/or crash?  Do you receive any warnings?
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Jugnoo2013

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Daily transactions for data updates and searches cause the freeze. JBOSS 4.0 web server and sometimes whole server needs to be restarted to fix the freeze.

Following generic message in server log is found:

Unexpected Error
java.lang.OutOfMemoryError: Java heap space

Overall server's health look good.
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Steven Harris
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Is there a way to seamlessly upgrade from 8.2 to Adobe LiveCycle ES4?
Direct upgrade to LiveCycle ES4 from 8.2.1 is not supported.
Does it mean complete re-write of the application?
It is correct that direct upgrade from ES 8.2.x to ES4 is not supported, but you can upgrade to ES2 and then upgrade to ES4.  So you can get there.

When you upgrade you will need to go through your applications because the model changed from ES to ES2.  You could continue to run things in compatibility mode, but I'd recommend against that - as soon as you need to make any changes, then you'd be upgrading your processes on the fly, and it's better to do it when you have time.

You should read this PDF for the changes from ES to ES2 - once things are running in ES2 they will move to ES4 without difficulty:
     http://help.adobe.com/en_US/livecycle/9.0/prepareupgrade_8x.pdf
Thanks for all the advise!