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https://issues.apache.org/jira/browse/DERBY-5840?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Knut Anders Hatlen updated DERBY-5840:
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    Attachment: derby-5840-23-aa-parsers.diff

The build script post-processes the parsers generated by JavaCC and inserts 
@SuppressWarnings("unchecked") to silence the compiler.

JavaCC has a JDK_VERSION option, and when it's set to "1.5" it produces code 
that compiles cleanly. (I also tried with "1.6", but our version of JavaCC is 
too old to recognize that version.)

The attached patch, derby-5840-23-aa-parsers.diff, sets JDK_VERSION = "1.5" in 
all the jj files and removes the post-processing target from the build script.

The code compiles without warnings with the patch. I'm running regression tests.
                
> Clean up compiler warnings introduced by using Java 5 language features
> -----------------------------------------------------------------------
>
>                 Key: DERBY-5840
>                 URL: https://issues.apache.org/jira/browse/DERBY-5840
>             Project: Derby
>          Issue Type: Improvement
>          Components: Miscellaneous
>    Affects Versions: 10.10.1.1
>            Reporter: Rick Hillegas
>         Attachments: derby-5840-01-aa-compatibilityTests.diff, 
> derby-5840-02-aa-compatibilityTests-again.diff.txt, 
> derby-5840-03-aa-drda.diff, derby-5840-03-ab-drda.diff, 
> derby-5840-04-aa-client-level.diff, derby-5840-05-aa-client-deprecation.diff, 
> derby-5840-06-aa-jdbc3-stubs.diff, derby-5840-07-aa-drda-for-each.diff, 
> derby-5840-08-aa-jdbc3-embedded.diff, 
> derby-5840-09-aa-test-deprecation-and-unchecked.diff, 
> derby-5840-10-aa-derbynet-perf-system.diff, 
> derby-5840-11-aa-engine-i18n-store-tools.diff, derby-5840-12-aa-jdbcapi.diff, 
> derby-5840-13-aa.diff, derby-5840-13-aa-remove-suppression.diff, 
> derby-5840-14-aa-bigdecimal.diff, derby-5840-15-aa-more-suppressions.diff, 
> derby-5840-16-aa-class-size-catalog.diff, 
> derby-5840-17-aa-property-conglomerate.diff, derby-5840-18-aa-arrayutil.diff, 
> derby-5840-19-aa-ddutils.diff, derby-5840-20-aa-collectnodes.diff, 
> derby-5840-21-aa-arrays.diff, derby-5840-22-aa-grouped-aggregates.diff, 
> derby-5840-23-aa-parsers.diff
>
>
> Using Java 5 language features forces us to compile code at level 5 or 
> higher. At this level, the compiler raises warnings not seen at lower levels. 
> This issue is a place to discuss and attach cleanup to eliminate these 
> warnings.

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