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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