[jira] [Created] (UIMA-5905) uv2 work around Java 11 build issue with ByteBuffer return type change

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

Marshall Schor created UIMA-5905:
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             Summary: 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


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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