Oracle database JVM termination

[sillyVM]

Hey, all the experts,
I have a oracle database shuts itself down day to day, any ideas why is my JVM being terminated? Or should this go to Java programmer forum?

07/02/27 09:49:20 Forced or abrupt (crash etc) server shutdown detected, starting recovery process...
07/02/27 09:49:20 Recovery completed, 0 connections committed and 0 rolled back...
07/02/27 09:49:20 9.0.4.1.0 Started
07/02/27 09:52:21 9.0.4.1.0 Started
07/02/27 09:52:22 Forced or abrupt (crash etc) server shutdown detected, starting recovery process...
07/02/27 09:52:22 Recovery completed, 0 connections committed and 0 rolled back...
07/02/27 09:52:22 9.0.4.1.0 Started
07/02/27 09:52:27 9.0.4.1.0 Stopped (JVM termination)
07/02/28 06:54:28 9.0.4.1.0 Started
07/02/28 06:54:29 9.0.4.1.0 Started
07/02/28 09:47:29 9.0.4.1.0 Stopped (JVM termination)
07/02/28 09:55:45 9.0.4.1.0 Started
07/02/28 09:55:46 9.0.4.1.0 Started
07/03/05 11:56:38 9.0.4.1.0 Stopped (JVM termination)
07/03/05 11:56:44 9.0.4.1.0 Started
07/03/05 11:56:44 9.0.4.1.0 Started