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https://issues.apache.org/jira/browse/DERBY-6856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16124749#comment-16124749
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Rick Hillegas commented on DERBY-6856:
--------------------------------------
I tested Derby against build 181 of JDK 9:
o with 6856 patch, Derby compiles cleanly
o with 6856 patch, tests run cleanly
o with 6856 patch, javadoc compiles cleanly
o the development trunk, compiled with JDK 8, runs tests cleanly under JDK 9
o 10.13.1.1 runs the JUNIT tests cleanly under JDK 9
The canon-based tests failed to run when using 10.13.1.1 against JDK 9. This is
because the derbyall script could not be found. That, in turn, is because
10.13.1.1 does not have the derby-6856-11-aa-jigsawResourceLocation.diff (see
above).
In short, build 181 of JDK 9 looks good to me.
> Make it possible to build Derby using JDK 9
> -------------------------------------------
>
> Key: DERBY-6856
> URL: https://issues.apache.org/jira/browse/DERBY-6856
> Project: Derby
> Issue Type: Improvement
> Components: Build tools
> Affects Versions: 10.12.1.1
> Reporter: Rick Hillegas
> Attachments: derby-6856-01-ab-addShardingKey.diff,
> derby-6856-01-ac-cleanup.diff, derby-6856-02-aa-addShardingKey.diff,
> derby-6856-03-aa-autoboxingDeprecationWarnings.diff,
> derby-6856-03-ab-autoboxingDeprecationWarnings.diff,
> derby-6856-04-aa-autoboxingDeprecationWarnings-part2.diff,
> derby-6856-04-ab-autoboxingDeprecationWarnings-part2.diff,
> derby-6856-05-ac-roundingMode-Class.newInstance.diff,
> derby-6856-05-af-roundingMode-Class.getDeclaredConstructor.diff,
> derby-6856-05-ag-roundingMode-Class.newInstance.diff,
> derby-6856-06-aa-observable.diff, derby-6856-07-aa-oneMoreNewInstance.diff,
> derby-6856-08-aa-cleanupJavadoc.diff, derby-6856-09-aa-javadocEntities.diff,
> derby-6856-10-aa-disable-permissions-subverting-test.diff,
> derby-6856-11-aa-jigsawResourceLocation.diff, derby-6856-XX-ab-base.diff,
> derby-6856-XX-ac-base.diff, derby-6856-XX-ad-base.diff,
> derby-6856-XX-ae-base.diff, PTest.java, ptestScript
>
>
> Derby can't be built with JDK 9. Java 9 introduces new JDBC classes like
> java.sql.ShardingKey and methods which refer to these new classes.
> In addition, project Jigsaw has created a new way to name classes (see
> http://openjdk.java.net/jeps/220). This breaks the PropertySetter build tool
> which we use so that old JVMs can compile Derby and so that Derby can be
> compiled to run on old JVMs.
> It is likely that we will need to leave this issue open throughout the
> development cycle of Java 9.
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