Compile/run issue with Java 12 and 1.8

[qqmyers]

FWIW: I just tried compiling Dataverse with a Java 12.02 version and while it initially looked OK, when I uploaded a file I got

java.lang.NoSuchMethodError: java.nio.MappedByteBuffer.rewind()Ljava/nio/MappedByteBuffer;
        at edu.harvard.iq.dataverse.ingest.IngestableDataChecker.detectTabularDataFormat(IngestableDataChecker.java:627)

and related errors. This appears to be related to jetty/jetty.project#3244 . I tried a quick test to use the maven release attribute as discussed there but it didn't work. Possibly a newer version of the compiler plugin is needed.

In any case, it looks like compiling with 12.02 and the current pom.xml doesn't produce a war that can be run on a Java 1.8x machine.

[pdurbin]

@qqmyers yuck. Thanks for the bug report. Please see also pull request #5116 and issue #4259.

[qqmyers]

@pdurbin - thanks - I've seen those issues, didn't realize it was also a compile issue versus running glassfish4 and everything on it. Hopefully this #6320 PR will at least remove the compile problem.