Findbugs reports some warnings based on serialization + final field clashes in the exception types declared in javax.lang.model.type. These warnings can be addressed by clarifying how those classes are written.
JDK-6226715(ann) java.lang.annotation.AnnotationTypeMismatchException could not be serialized
JDK-6519115MirroredTypeException thrown but should be MirroredTypesException
JDK-6929645Address various findbugs warnings in langtools
JDK-6574090Remove unnecessary synchronization of readObject methods