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It would be helpful if you can provide additional information about your application:
- project | Properties | Project Facets, list all the facets & associated version
- project | properties | Project Facets | Spring Facet, the type of library
- project | Properties | Targeted Runtimes, WLS version
Please also mention the full version of 11g on which the application worked fine and did you migrate the app to 12c RT or run the app as-is on 12c.
I'm not sure what Project Facets or Spring Facets are. I am sure that the Spring framework being used is horribly back-version as this is an application that has been used for several years without an update to the plumbing.
The system specifics for the application server are:
Windows based - JDK 1.6 64-bit.
The application started as a WebLogic 9.2.3 domain.
I upgraded it to WebLogic 11g (10.3.5) using the domain migration tool, and was able to run it with some tweaking to the JVM flags:
Added the following: -Dcom.sun.management.jmxremote
Then upgraded it to WebLogic 12c (12.1.1) using the domain migration tool. The errors I am seeing are in a small service mix deployment that gets generated/deployed automatically the first time the main application gets started.
From the looks of it, I may need to get a developer to look into it. They could find the answers to your questions. I was hoping there was some magic bullet setting that would force back-level compatability, but I don't even lnow exactly which part of WL I am having issues with. That would make this a bit of a wild-goose chase until I come up with something more specific.
Sorry for the bother.
If you are simply trying to migrate an existing domain with an application to a newer version of the server, then this isn't a tooling question. You will get better support by asking your question on the WLS forum.
WebLogic Server - General