weblogic - java.lang.ClassNotFoundException: afu.com.sun.source.tree.Tree$Kind

Question

When migrating our application from weblogic 12.1.3 to 12.2.1 we run into the following stacktrace during deployment of our EAR:

<2018-06-05 16:17:03,765> <Error> <Deployer> <BEA-149265> <Failure occurred in the execution of deployment request with ID "518856605645758" for task "2" on [partition-name: DOMAIN]. Error is: "java.lang.ClassNotFoundException: afu.com.sun.source.tree.Tree$Kind"
java.lang.ClassNotFoundException: afu.com.sun.source.tree.Tree$Kind
        at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:1029)
        at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:990)
        at weblogic.utils.classloaders.ChangeAwareClassLoader.findClass(ChangeAwareClassLoader.java:104)
        at weblogic.utils.classloaders.GenericClassLoader.doFindClass(GenericClassLoader.java:611)
        at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:543)
        Truncated. see log file for complete stacktrace

I cannot find anything on the internet about this class and who might be using it, and so I have no clue how to solve this.

Question: Where does the afu.com.sun.* package come from, and how do I get rid of the dependency on this Tree class?

Answer 1

This is related to the checker framework (https://checkerframework.org/). You probably just need to add a dependency to your classpath: org.checkerframework:checker-qual, or org.checkerframework:checker-compat-qual for Java 6 or 7.