JDK 9 images are now modular

[mark.reinhold at oracle.com]

FYI, the initial changesets for JEP 220: Modular Run-Time Images [1]
were pushed just a few minutes ago.  If you build JDK 9 yourself, or if
you download the next early-access build [2] (which should be available
tomorrow), you'll see all of the changes documented in JEP 220.

To summarize (please see the JEP for details):

  - The "jre" subdirectory is no longer present in JDK images.

  - The user-editable configuration files in the "lib" subdirectory have
    been moved to the new "conf" directory.

  - The endorsed-standards override mechanism has been removed.

  - The extension mechanism has been removed.

  - rt.jar, tools.jar, and dt.jar have been removed.

  - A new URI scheme for naming stored modules, classes, and resources
    has been defined.

  - For tools that previously accessed rt.jar directly, a built-in NIO
    file-system provider has been defined to provide access to the class
    and resource files within a run-time image.

We have a few open issues to finish up, so further changes will follow
for this JEP, but none will be as disruptive as today's merge.

- Mark


[1] http://openjdk.java.net/jeps/220
[2] https://jdk9.java.net/download/