[jira] [Commented] (UIMA-5904) uv3 work around Java 11 build issue with ByteBuffer return type change

["Marshall Schor (JIRA)" <de...@uima.apache.org>]

    [ https://issues.apache.org/jira/browse/UIMA-5904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16684371#comment-16684371 ] 

Marshall Schor commented on UIMA-5904:
--------------------------------------

I discovered I could reproduce this problem in Eclipse with just the built-in test cases, by building with Java 11 and then running the test with Java 8 (via JRE config of the eclipse launcher).  Verified this fixed this issue, and ran all the uimaj-core tests to verify no other instance of this kind of failure is present.

> uv3 work around Java 11 build issue with ByteBuffer return type change
> ----------------------------------------------------------------------
>
>                 Key: UIMA-5904
>                 URL: https://issues.apache.org/jira/browse/UIMA-5904
>             Project: UIMA
>          Issue Type: Bug
>          Components: Core Java Framework
>         Environment: only happens when building with Java > 8 and then running with Java 8
>            Reporter: Marshall Schor
>            Assignee: Marshall Schor
>            Priority: Major
>             Fix For: 3.0.1SDK
>
>         Attachments: uima-core.jar
>
>
> See https://github.com/apache/felix/pull/114 . 
>  
> Java 9 introduces overridden methods with covariant return types for the following methods in java.nio.ByteBuffer:
>     position​(int newPosition)
>     limit​(int newLimit)
>     flip​()
>     clear​()
>     mark​()
>     reset​()
>     rewind​()
> In Java 9 they all now return ByteBuffer, whereas the methods they override return Buffer,
> resulting in exceptions like this when executing on Java 8 and lower:
> java.lang.NoSuchMethodError: java.nio.ByteBuffer.limit(I)Ljava/nio/ByteBuffer
> This is because the generated byte code includes the static return type of the method, which is not found on Java 8 and lower because the overloaded methods with covariant return types don't exist (the issue appears even with source and target 8 or lower in compilation parameters).
> The solution is to cast ByteBuffer instances to Buffer before calling the method.



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