The Java SE 8 Compact Profiles:
http://openjdk.java.net/jeps/161
provides for subsetting of the Java SE 8 platform. While the
specification covers the platform, we are only providing a reference
implementation on Linux x86 at this time.
This work is covered by a number of CRs due to there being a need for a
number of CC requests to modifying existing specifications
8004265: Add build support for Compact Profiles
8004502: Compact Profiles contents
8003255: (profiles) Update JAR file specification to support profiles
8003256: (profiles) Add support for profile identification
8004931: add/removePropertyChangeListener should not exist in subset
Profiles of Java SE
The changes primarily involve the build, as you would imagine, the
compact profiles define:
- which files (binaries, jars, native libs) are in a JRE
(profile-includes.txt)
- which packages/classes are in rt.jar/resources.jar
(profile-rtjar-includes.txt)
But there are additional source changes:
- to support reporting the profile name as part of version information
- to test the versioning and tool changes
and also changes to java, javac and jar so that you can indicate which
profile you are targeting, and have javac make sure you don't use an API
that won't be present; and which profile you need to run (listed in your
executable jar) so the launcher can reject it if it isn't the right
profile. The launcher and jar changes are included in this webrev, while
the javac changes are being integrated separately (plus some related
javadoc changes).
Only the new build system is supported for building profiles.
webrevs:
top-level repo: http://cr.openjdk.java.net/~dholmes/8004265/webrev.top/
The main change is to simply add profiles and profiles-only as top level
make targets (similar to images). There is also a change to remove the
hardcoded version information (though this may be handled by a separate CR).
jdk repo: http://cr.openjdk.java.net/~dholmes/8004265/webrev.jdk/
The overall build changes expand on the pre-existing definitions whereby
a JRE is a JDK with things take out. So a compact JRE is then a JRE with
additional things taken out. There are three compact profiles (compact1
being the smallest) and a full JRE. For internal build purposes these
are referred to as PROFILE_1 etc, with a full JRE being represented by
PROFILE_4 when needed. The specification for profiles indicates what is
included in each profile, but the build rules then invert this to obtain
a set of exclusions for each profile: the exclusions of a given profile
is the set of inclusions of all larger profiles and the JRE (and of
course the JDK).
Please note I only expect build folks to look at build changes and
core-libs to look at src/test changes (all of which have been developed
by Alan Bateman) and there is no need to cross-post your responses.
Like many I am about to head for Xmas break but I will continue to
monitor email and deal with changes as needed. This is needed for M6 and
we need to be ready to push in early January.
Thanks,
David Holmes
