java throw Connection reset exception when connecting to oracle database using jdbc

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When java application connect to oracle 12c database using jdbc (run in rhel5), connection reset exception sometime will throw randomly.

java.sql.SQLRecoverableException: IO Error: Connection reset

Tested the same java in solaris, no such exception. Follow https://access.redhat.com/solutions/353653 tune jvm argument and run rngd daemon, issue persists. We tried everything we can do about this, no luck. Any one have any hints or idea what's going on?

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