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https://issues.apache.org/jira/browse/DERBY-6856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15578451#comment-15578451
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Rick Hillegas commented on DERBY-6856:
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I successfully compiled and tested Derby with build 140 of JDK 9.

> 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-XX-ab-base.diff, derby-6856-XX-ac-base.diff
>
>
> 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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