Re: building with Java 11 - incompatibility workaround

[Marshall Schor <ms...@schor.com>]

ok, great, thanks!  That enabled me to find the problem.

I'll cancel the v3 vote, and fix this and rebuild with java 8.

Before I do the next release candidate, I plan to rebuild uimaj-core with Java
11, and get it to you for retesting, with the "workaround", which I hope you'll
retest to see if everything works on Java 8 :-).

-Marshall


On 11/12/2018 8:35 AM, Richard Eckart de Castilho wrote:
> Hi,
>
> so when I run one of the tests in Eclipse, the stack trace is more complete:
>
> java.lang.NoSuchMethodError: java.nio.ByteBuffer.position(I)Ljava/nio/ByteBuffer;
> 	at org.apache.uima.util.impl.DataIO.decodeUTF8(DataIO.java:68)
> 	at org.apache.uima.util.impl.DataIO.readUTFv(DataIO.java:124)
> 	at org.apache.uima.cas.impl.BinaryCasSerDes4$Deserializer.deserialize(BinaryCasSerDes4.java:1647)
> 	at org.apache.uima.cas.impl.BinaryCasSerDes4$Deserializer.access$200(BinaryCasSerDes4.java:1472)
> 	at org.apache.uima.cas.impl.BinaryCasSerDes4.deserialize(BinaryCasSerDes4.java:281)
> 	at org.apache.uima.cas.impl.BinaryCasSerDes.reinit(BinaryCasSerDes.java:569)
> 	at org.apache.uima.util.CasIOUtils.load(CasIOUtils.java:381)
> 	at org.apache.uima.util.CasIOUtils.load(CasIOUtils.java:312)
> 	at org.apache.uima.util.CasIOUtils.load(CasIOUtils.java:236)
> 	at de.tudarmstadt.ukp.dkpro.core.io.bincas.BinaryCasReader.getNext(BinaryCasReader.java:211)
> 	at de.tudarmstadt.ukp.dkpro.core.io.bincas.BinaryCasWriterReaderTest.read(BinaryCasWriterReaderTest.java:527)
> 	at de.tudarmstadt.ukp.dkpro.core.io.bincas.BinaryCasWriterReaderTest.test4Preinitialized(BinaryCasWriterReaderTest.java:150)
>
> DataIO.java:68:
> 68:      in.position(in.position() + length);
> 69:      return sb.toString();  // doesn't copy the string char array
>
> The signature of Buffer.position(int) in Java 1.8 is:
>
>       public final Buffer position(int newPosition) {...
>
> ... and ByteBuffer does not override it.
>
> E.g. looking at Java 10, I can see this method signature in ByteBuffer overiding
> the position(int) method from Buffer using a co-variant return type:
>
>     ByteBuffer position(int newPosition) {
>         super.position(newPosition);
>         return this;
>     }
>
> The trouble is that when we compile UIMAv3 against a recent Java, DataIO binds against
> this co-variant override which causes the exception when we actually trying to run that
> on a Java 8 then.
>
> The verbose option logs all the loaded classes to the console, but I'm not sure 
> what information would be of interest to you.
>
> Cheers,
>
> -- Richard
>
>> On 10. Nov 2018, at 20:42, Marshall Schor <ms...@schor.com> wrote:
>>
>> Hi, you're very kind to keep trying things :-)  One more thing to try:
>>
>> Rerun the failing scenario, but start the JVM with the -verbose:class JVM
>> parameter, so we could see what was loading the class that caused the error. 
>> The JVM loads classes in parallel by default I think, so in the trace it might
>> not be the immediately preceding class...
>>
>> Cheers. -Marshall
>