JDK 9 images are now modular with JDK 9 Early Access build 41

Rory O'Donnell rory.odonnell at oracle.com
Tue Dec 9 08:42:51 UTC 2014

Hi All,

The initial changesets for JEP 220: Modular Run-Time Images [1] are 
with JDK 9 early-access build 41 [2].

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 
        and resource files within a run-time image.

More details are available at Mark Reinhold's latest blog entry [3]

Rgds, Rory

[1] http://openjdk.java.net/jeps/220
[2] https://jdk9.java.net/download/
[3] http://mreinhold.org/blog/jigsaw-modular-images

Rgds,Rory O'Donnell
Quality Engineering Manager
Oracle EMEA , Dublin, Ireland

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