JObjC was dropped from the build in JDK 8, it was dropped in a JDK 7 update too. The remnants of it were removed from the build via JDK-8033111 in jdk9-b03 but the dead code in the jdk/src/macosx/native/jobjc was not removed. Is there any reason to keep it around in the JDK 9 forest? -Alan.