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From "Uwe Schindler (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3850) Fix rawtypes warnings for Java 7 compiler
Date Thu, 08 Mar 2012 17:13:58 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13225313#comment-13225313
] 

Uwe Schindler commented on LUCENE-3850:
---------------------------------------

bq. warning: [options] bootstrap class path not set in conjunction with -source 1.6

Its because you are compiling the code with Java 7 but using 1.6 compatibility. Previous versions
did not complain about that (e.g. compiling 1.5 code with 1.6). This warning simply says,
that you should have a different bootstrap classpath with only the 1.6 JDK rt.jar in it, so
the compiler can check that the methods/classes you are using are really existing. If you
compoile against Java 7's rt.jar this is not guaranteed.

The warning is obsolete for us, as we also check java 6 and java 5 (for 3.x).
                
> Fix rawtypes warnings for Java 7 compiler
> -----------------------------------------
>
>                 Key: LUCENE-3850
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3850
>             Project: Lucene - Java
>          Issue Type: Improvement
>    Affects Versions: 3.5, 4.0
>            Reporter: Uwe Schindler
>            Assignee: Uwe Schindler
>             Fix For: 3.6, 4.0
>
>         Attachments: LUCENE-3850-part1-branch3x.patch, LUCENE-3850-part1.patch, LUCENE-3850-part2.patch,
LUCENE-3850-parts2-branch3x.patch
>
>
> Java 7 changed the warnings a little bit:
> - Java 6 only knew "unchecked" warning type, applying for all types of generics violations,
like missing generics (raw types)
> - Java 7 still knows "unchecked" but only emits warning if the call is really unchecked.
Declaration of variables/fields or constructing instances without type param now emits "rawtypes"
warning.
> The changes above causes the Java 7 compile now emit lots of "rawtypes" warnings, where
Java 6 is silent. The easy fix is to suppres both warning types: @SuppressWarnings({"unchecked","rawtypes"})
for all those places. Changes are easy to do, will provide patch later!

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