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Re: JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are available on jdk.java.net

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On 29.11.2017 14:22, Emmanuel Bourg wrote:
> Le 29/11/2017 à 13:30, dalibor topic a écrit :
> 
>> I think what makes Debian GNU/Linux interesting for us regarding the
>> OpenJDK Quality Outreach is that it's one of the first Linux
>> distributions to do mass rebuilds of its (quite substantial) package
>> archive with JDK 9. So it has the means and the knowledge among its
>> contributors to potentially provide valuable perspectives about the
>> impact of individual changes planned for future OpenJDK releases (JDK
>> 10, etc.) that go beyond what individual FOSS projects can.
> 
> FYI we have a list of bugs to be addressed to complete the transition to
> Java 9:
> 
> https://bugs.debian.org/cgi-bin/pkgreport.cgi?tag=default-java9;users=debian-java@lists.debian.org

Thanks, Emmanuel - in many of these cases (AspectJ, ICU, Spotbugs, 
Gradle, Scala) the way forward seems to be to upgrade the packaged 
software to the latest upstream version supporting JDK 9, often thanks 
to the patches provided by Chris West and the related efforts to rebuild 
the Debian archive with JDK 9 early access builds.

More general information on migrating to JDK 9 is available at 
https://docs.oracle.com/javase/9/migrate/toc.htm#JSMIG-GUID-7744EF96-5899-4FB2-B34E-86D49B2E89B6

> The removal of the old source/target in javac,

Yeah, that's http://openjdk.java.net/jeps/182 . There have been some 
discussions about adjustments to that policy in light of the new release 
model at 
http://mail.openjdk.java.net/pipermail/jdk-dev/2017-November/000108.html 
but no decision has been made yet.

> the increasing strictness
> of javadoc 

That's http://openjdk.java.net/jeps/172 . While the checks are on by 
default, many can be turned off using the option -Xdoclint:none. Please 
see 
https://docs.oracle.com/javase/9/javadoc/javadoc-command.htm#JSJAV-GUID-1ABCA873-009C-4BB4-9490-51A716C8AA56 
for details.

> and the removal of APIs (javax.xml.bind, javax.activation)
> have been the most disrupting changes so far.

That's http://openjdk.java.net/jeps/261 - while the EE APIs haven't been 
removed from JDK 9, they need to be explicitly resolved per 
https://docs.oracle.com/javase/9/migrate/toc.htm#JSMIG-GUID-F640FA9D-FB66-4D85-AD2B-D931174C09A3 
.

The EE APIs have been deprecated for removal, though, and there is a 
draft JEP at http://openjdk.java.net/jeps/8189188 elaborating on that - 
their removal is not yet scheduled for any specific release, though.

As such, the way forward for users of such APIs would be to migrate to 
standalone implementations, rather than the one provided in the JDK.

> We haven't started testing with OpenJDK 10 yet. Matthias has uploaded
> the openjdk-10 package to experimental last week. I guess we'll start
> mass rebuilds with JDK 10 once the JDK 9 issues are under control.

According to the JDK 10 schedule at 
http://openjdk.java.net/projects/jdk/10/ the rampdown phase for JDK 10 
will start mid-December. Before rampdown is often the best time to 
provide feedback on features and their design and implementation, while 
after rampdown is a good time to provide feedback on regressions.
> We don't ship classes.jsa with OpenJDK yet, I don't know if there is a
> reason for that. Does it require a specific parameter when building OpenJDK?

It requires running java with -Xshare:dump on installation. See 
https://mjg123.github.io/2017/10/02/JVM-startup.html for an example and 
https://mjg123.github.io/2017/10/04/AppCDS-and-Clojure.html for an 
example using AppCDS.
> Shipping an extra arch-specific package containing the AppCDS file for
> each worthy application shouldn't be too difficult. I'm not sure how it
> would play with package dependencies though. Is there a unique .jsa file
> for the application, or one per library? 

It's per application, and specified using the -XX:SharedArchiveFile 
option per http://openjdk.java.net/jeps/310 .

> What happens if the classes in
> the jsa files don't match the classes in the jar files? Is the data
> automatically invalidated and ignored?

Yes. If -Xshare:on is used, then the VM will exit when it detects a 
discrepancy (different classpath, etc.) or if it can't mmap the shared 
archive. With -Xshare:auto, it'll ignore the shared archive file, and 
load the classes as usual.

cheers,
dalibor topic

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JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are available  on jdk.java.net "Rory O'Donnell" <rory.odonnell@oracle.com> - 2017-11-28 16:50 +0100
  Re: JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are  available on jdk.java.net Matthias Klose <doko@debian.org> - 2017-11-29 02:20 +0100
    Re: JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are  available on jdk.java.net Emmanuel Bourg <ebourg@apache.org> - 2017-11-29 09:20 +0100
      Re: JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are  available on jdk.java.net "Rory O'Donnell" <rory.odonnell@oracle.com> - 2017-11-29 10:10 +0100
        Re: JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are  available on jdk.java.net Emmanuel Bourg <ebourg@apache.org> - 2017-11-29 10:30 +0100
          Re: JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are  available on jdk.java.net dalibor topic <dalibor.topic@oracle.com> - 2017-11-29 13:40 +0100
            Re: JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are  available on jdk.java.net Emmanuel Bourg <ebourg@apache.org> - 2017-11-29 14:30 +0100
              Re: JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are  available on jdk.java.net dalibor topic <dalibor.topic@oracle.com> - 2017-11-30 10:30 +0100
                Re: JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are  available on jdk.java.net Emmanuel Bourg <ebourg@apache.org> - 2017-11-30 14:50 +0100
                Re: JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are  available on jdk.java.net dalibor topic <dalibor.topic@oracle.com> - 2017-12-01 11:20 +0100
                Re: JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are  available on jdk.java.net Emmanuel Bourg <ebourg@apache.org> - 2017-12-13 11:20 +0100
                Re: JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are  available on jdk.java.net dalibor topic <dalibor.topic@oracle.com> - 2017-12-13 13:40 +0100
        Re: JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are  available on jdk.java.net dalibor topic <dalibor.topic@oracle.com> - 2017-11-29 10:40 +0100
          Re: JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are  available on jdk.java.net Emmanuel Bourg <ebourg@apache.org> - 2017-11-29 12:50 +0100
            Re: JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are  available on jdk.java.net tony mancill <tmancill@debian.org> - 2017-11-29 14:10 +0100
            Re: JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are  available on jdk.java.net dalibor topic <dalibor.topic@oracle.com> - 2017-11-29 14:40 +0100
              Re: JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are  available on jdk.java.net Emmanuel Bourg <ebourg@apache.org> - 2017-11-30 15:10 +0100
                Re: JDK 10 Early Access b33 and JDK 8u162 Early Access b03 are  available on jdk.java.net dalibor topic <dalibor.topic@oracle.com> - 2017-12-01 18:20 +0100

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