Re: Preparing for Java 9

[James Perkins <jrperkinsjr@xxxxxxxxx>]

This is mostly due to JPMS (Jigsaw) which has not yet been approved by the
EG. IBM took an official stance [1] on the JPMS mailing list. You can see
theirs, as well as others, responses to the vote as well [2]. This will
likely have a rather large impact on Java applications.

The jdeps tool, introduced in Java 8 [3], was essentially made so you can
see what libraries are using unsupported classes. For example
sun.misc.BASE54Encoder is a popular one and Java 8 introduced
java.util.Base64 which would be the replacement. Oracle has a fairly well
done wiki [4] that describes what you should use if you're using a
proprietary unsupported class.

I don't know if IBM has any early access JDK 9 builds, but if you're
considering using Java 9 I'd definitely recommend testing it.

[1]:
http://mail.openjdk.java.net/pipermail/jpms-spec-experts/2017-April/000684.html
[2]: https://jcp.org/en/jsr/results?id=5959
[3]: https://docs.oracle.com/javase/8/docs/technotes/tools/unix/jdeps.html
[4]:
https://wiki.openjdk.java.net/display/JDK8/Java+Dependency+Analysis+Tool

--
James R. Perkins

On Tue, May 16, 2017 at 5:43 AM, Rob Berendt <rob@xxxxxxxxx> wrote:

> Based on the most recent thread I just noticed this nugget.  Apparently
> Java 9 will affect some classes and you need to read this:
>
> <snip>
> IBM Technology for Java 9.0 is under development. Java 9 contains many
> changes and updates that may cause your existing applications to no longer
> work. To help prepare for Java 9 adoption, ​the 'jdeps' tool has been
> created and is shipped with Java 8. This tool identifies references to
> internal classes that need to be fixed. By identifying these issues early,
> you can plan to fix the issues in advance of Java 9 being available. If
> you use the Java 8 version of jdeps, it will also identify references to
> com.ibm.* classes, some of which are security related and may have
> changed. The 'jdeps' tool will be updated a future to properly identify
> additional com.ibm.* classes which won't be available in Java 9.
> https://wiki.openjdk.java.net/display/JDK8/Java+Dependency+Analysis+Tool
> </snip>
>
> I got this at
> https://ibm.co/2m0vn11
> https://www.ibm.com/developerworks/community/
> wikis/home?lang=en#!/wiki/IBM%20i%20Technology%20Updates/
> page/News%20of%20Java%20on%20IBM%20i
>
>
>
> Rob Berendt
> --
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