Hello,
Sorry to hear. No, there's no way to uninstall a Java update. First of all I'd suggest you give more information when posting such things (ie; OS version, hardware, etc that may help in troubleshooting!).
Have you attempted Repairing Permissions?
Did you attempt re-installing?
If using Jaguar still, did you download and install the Java Security update?
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FW800 MDD G4/1GHz/1GB RAM/OS 10.4.x/Radeon 9800 Pro (KICKASS GPU!!!)/DVR-109BK SuperDrive/16x LaCie FW CD-RW