F21 System Wide Change: Java 8

[Dan Horák]

On Fri, 21 Mar 2014 13:11:44 +0100
Jaroslav Reznik <jreznik at redhat.com> wrote:

> = Proposed System Wide Change: Java 8 =
> https://fedoraproject.org/wiki/Changes/Java8
> 
> Change owner(s): Omair Majid <omajid at redhat.com>
> 
> Make Java 8 (provided by OpenJDK 8 which is java-1.8.0-openjdk) the
> default Java runtime. The current default Java runtime (Java 7,
> provided by OpenJDK 7, java-1.7.0-openjdk) will be obsoleted and
> removed.

are we confident OpenJDK 8 works well on all Fedora arches, not only on
the primary ones? Task for myself (or any volunteer) is to check
whether https://bugzilla.redhat.com/show_bug.cgi?id=958232 is still open


		Dan

> This is essentially an upgrade to the latest Java and OpenJDK
> version. 
> 
> == Detailed Description ==
> The current default Java 7 runtime in Fedora is OpenJDK 7. The latest
> version of OpenJDK, 8, was released on 18 March 2014. Given that
> Fedora 21 will not be released before August, it makes sense to
> include the latest version of OpenJDK in Fedora 21.
> 
> OpenJDK 8 is a significant update to Java. It brings in significant
> new features to the Java language, including lambdas, a new
> javascript engine and lots of new library features. A complete list
> of features is available [1].
> 
> OpenJDK 8 is a backwards compatible update. Theoretically everything
> that worked against OpenJDK 7 should continue working against OpenJDK
> 8. There are a few exceptions:
> 
>     OpenJDK8 is much more strict when it comes to building javadocs.
> Many - javadoc package in Fedora fail to build. Those that are built
> should continue working just fine.
>     Packages that rely on non-public OpenJDK API may fail to
> build/run. 
> 
> A complete list of incompatibilities is available [2]. The
> incompatibilities are source and behavioral only.
> 
> It may be a good idea to mass rebuild Java packages against OpenJDK 8
> to spot any source incompatibilities earlier. This is not required.  
> 
> == Scope ==
> * Proposal owners:
> ** Deprecate/Obsolete java-1.7.0-openjdk
> ** Promote java-1.8.0-openjdk to a full java runtime status (fix
> provides in package)
> ** In case of a mass rebuild, supply/apply patches to fix build
> against OpenJDK 8
> 
> * Other developers:
> ** icedtea-web maintainers will need to update icedtea-web to run
> against OpenJDK 8
> ** Other java packagers will need to apply patches to their java
> package to ensure they can build against OpenJDK 8
> ** Everyone will need to test packages to verify that they work
> against OpenJDK 8
> 
> * Release engineering:
> ** Remove java-1.7.0-openjdk
> ** Possibly mass-rebuild (?) all Java packages. This is not strictly
> required to make OpenJDK 8 the default Java runtime.
> 
> * Policies and guidelines: 
> ** Many -javadoc packages fail to build. The OpenJDK 8 maintainers
> and the Java SIG are working on identifying a solution. The solution
> may require [3] guideline changes making -javadoc subpackages
> optional.
> 
> [1] http://openjdk.java.net/projects/jdk8/features 
> [2]
> http://www.oracle.com/technetwork/java/javase/8-compatibility-guide-2156366.html
> [3]
> https://lists.fedoraproject.org/pipermail/devel/2014-March/196808.html
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