[jira] [Resolved] (WICKET-5647) missing generic cast causes compile error on OS X / jdk 8

["Peter Ertl (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/WICKET-5647?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Peter Ertl resolved WICKET-5647.
--------------------------------

    Resolution: Fixed

> missing generic cast causes compile error on OS X / jdk 8
> ---------------------------------------------------------
>
>                 Key: WICKET-5647
>                 URL: https://issues.apache.org/jira/browse/WICKET-5647
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket
>    Affects Versions: 6.16.0, 7.0.0-M2
>         Environment: OS X 10.9.4
> JDK 1.8.0_11
>            Reporter: Peter Ertl
>            Assignee: Peter Ertl
>             Fix For: 7.0.0-M3, 6.17.0
>
>
> when trying to compile wicket-7 from HEAD it fails under OS X / JDK 1.8.0_11. Casting a NULL to generic type (T) solves the issues. This seems like some odd case of failing type inference.
> The problematic source line is:
>     return getEnumImpl(key, eClass, null);
> The compiler error is:
>   Error:(792, 35) java: incompatible types: inference variable T has incompatible upper bounds java.lang.Enum<T>,T
> This will fix the issue:
>     return getEnumImpl(key, eClass, (T)null);
> I found that there is a fix WICKET-5427 which does not work in most current JDK 1.8.0_11 anymore.



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