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I am running my applation with Java 1.4.2 version. Now i am migrating to Java 1.5. When I am running my app with new class files it is showing unsupported class version error. How can I change WebLogic server 8.1 SP6 to accept Java 1.5? Is this possible?
According to Oracle WebLogic 8.1 supported configurations, WebLogic 8.1 does not support Java 1.5. It might or might not work, but it is not recommended to try it in a production environment. If you search around, you will see that a lot of people had a lot of assorted problems while trying to use WebLogic 8.1 in conjunction with Java 1.5.
The best path would be trying to migrate to WebLogic 9 or newer, unless it has a prohibitive cost to your team. If that is not possible, it looks like you will have to stick with Java 1.4.2, unfortunately.