Declare maven dependency on tools.jar to work on JDK 9

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Your problems are caused by the Project Jigsaw changes that went into the Java 9 EA build you seem to have used. JEP 220 describes them.

The section Removed: rt.jar and tools.jar describes this in more detail but Risks and Assumptions contains a good summary:

JDK and JRE images will, as noted above, no longer contain the files lib/rt.jar, lib/tools.jar, lib/dt.jar, and other internal jar files. Existing code that assumes the existence of these files might not work correctly.

So as you observed, those files are gone. Further down:

Class and resource files previously found in lib/tools.jar and visible only when that file was added to the class path will now, in a JDK image, be visible via the system class loader or, in some cases, the bootstrap class loader. The modules containing these files will not, however, be mentioned in the application class path, i.e., in the value of the system property java.class.path.

So the classes from tools.jar are moved into modules but it seems like they might not be available to the user. You should use jdeps from a recent Jigsaw build…

  • … to determine your module dependencies: $jdeps -M -s $your_JAR
  • … to determine dependencies on JDK-internal APIs: jdeps -jdkinternals $your_JAR

If you’re lucky, the API you are using was published (then it will not show up in the second analysis) or have a public alternative (which the second analysis would list ). Otherwise you should consider taking this to the Jigsaw mailing list and ask for help there, noting explicitly which APIs you are using and what for.

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