Migration from Versions 4.5/5.1 to 8.1
If you're migrating from a version earlier than 6.0, you have a little more work to do. Luckily, WebLogic Server 8.1 includes a number of migration tools to make your upgrade as quick and painless as possible.
Upgrading a WebLogic 4.5/5.1 Installation to 8.1
Assuming that you've backed up all of your WebLogic 4.5/5.1 domains and installed WebLogic Server 8.1, the next thing you need to do is to upgrade your WebLogic Server license files.
Upgrading Your BEA License Files
To upgrade your license file, which is presumably a nonexpiring license file, first check to see which kind of license file format you have. It will be either a WebLogicLicense.class license file or a WebLogicLicense.xml file.
If it's WebLogicLicense.class ...
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