I have switched my development environment to primarily run with JDK14 and noticed some incompatibilities with Fluo.
Some of these are now fixed in a PR: https://github.com/apache/fluo/pull/1093 However, this doesn't completely fix JDK14 builds. Specifically, JDK14 removed the Concurrent Mark Sweep garbage collector. This garbage collector is hard-coded in MiniAccumuloCluster 2.0.0 and earlier. Since accumulo2-maven-plugin uses MiniAccumuloCluster, the tests cannot run in Fluo on JDK14. This issue has already been addressed in upstream Accumulo (https://github.com/apache/accumulo/pull/1427) for Accumulo 2.1.0. My proposed resolution is that Fluo should use an updated version of accumulo2-maven-plugin, after Accumulo 2.1.0 is released with the MiniAccumuloCluster improvements. Of course, this requires Accumulo 2.1.0 to be released first.
