[jira] [Resolved] (UIMA-5905) uv2 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-5905?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Marshall Schor resolved UIMA-5905.
----------------------------------
    Resolution: Fixed

> uv2 work around Java 11 build issue with ByteBuffer return type change
> ----------------------------------------------------------------------
>
>                 Key: UIMA-5905
>                 URL: https://issues.apache.org/jira/browse/UIMA-5905
>             Project: UIMA
>          Issue Type: Bug
>          Components: Core Java Framework
>    Affects Versions: 2.10.3SDK
>            Reporter: Marshall Schor
>            Assignee: Marshall Schor
>            Priority: Minor
>
> This is the UIMA Version 2 version of UIMA-5904 as a separate issue so they can be resolved separately.
> 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.
> The only use of these in UIMA is in DataIO class, and only the position(xxx) and limit(xxx) are used.



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