Caused by: java.lang.NoSuchMethodError: org.apache.zeppelin.interpreter.InterpreterGroup.keySet()Ljava/util/concurrent/ConcurrentHashMap$KeySetView;

[Serega Sheypak]

Hi, what is the right way to fix it? Found:
https://issues.apache.org/jira/browse/ZEPPELIN-2405
But I do compile with java-7 and run on java-7...