If PointerLocation discovers that an address is for a JNI local ref, it will print information about the thread that owns the JNI local ref. For JavaThreads it calls the printThreadIDOn(tty) method. There's a comment on the call that says that it 'includes "\n"'. This is actually not true, and a separate println() is needed. I noticed this when using the clhsdb findpc command on a JNI local ref and noted that the next "hdsb> " prompt was printed at the end of the findpc output instead of on a new line.