By default, uncaught exceptions and memory issues in JNI libraries are reported as "crashes".

Additionally, Jazzer provides a hooking framework that can be used to implement domain-specific sanitizers for logic bugs. See https://blog.code-intelligence.com/engineering-jazzer#user-c... for an example. Part of the reason for open-sourcing Jazzer has been to get the discussion started on what kind of "sanitizers" are needed to unlock the full potential of Java fuzzing.