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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (DERBY-5840) Clean up compiler warnings introduced by using Java 5 language features
Date Thu, 23 May 2013 19:05:23 GMT

     [ https://issues.apache.org/jira/browse/DERBY-5840?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Knut Anders Hatlen updated DERBY-5840:

    Attachment: derby-5840-19-aa-ddutils.diff

derby-5840-19-aa-ddutils.diff fixes a warning in DDUtils and removes the SuppressWarnings
annotation that silenced it.

The warning is caused by code that clones a Hashtable by calling clone() and casting the result
to Hashtable<String,Integer>. Since Object.clone() has not been generified and returns
a plain Object, that cast is unchecked.

The fix is to clone the object by calling Hashtable's copy constructor instead. That is, replace
    (Hashtable<String,Integer>) deleteConnHashtable.clone()
    new Hashtable<String, Integer>(deleteConnHashtable)

All tests ran cleanly with the patch.

Committed revision 1485827.
> 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:
>            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
> 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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