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https://issues.apache.org/jira/browse/DERBY-6856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15748431#comment-15748431
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Bryan Pendleton commented on DERBY-6856:
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The problematic code in that test appears to be part of DERBY-3476, and is code
that
tries to explore serialization errors with intentionally damaged system
permission objects?
It appears to be related to this code review comment from DERBY-2109:
https://issues.apache.org/jira/browse/DERBY-2109?focusedCommentId=12573003&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-12573003
This was before I was really involved very much in Derby, but I think it was a
concern about
system permission objects being stored in databases, or sent across the wire,
and having
changed incompatibly between Java releases such that the reader could not
successfully
deserialize the permission that had been created/stored/sent by the writer?
Kinda vague, I know, but hopefully it helps in your studies.
> 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: PTest.java, 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, 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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