I just installed Confluence on Ubuntu 16.04.
After installation an error is reported on the browser without any specifications of the problem.
In the logfile I found the following StackTrace:
2017-11-11 22:21:15,083 ERROR [http-nio-8090-exec-4] [[Standalone].[localhost].[/].[johnson-data-servlet]] log Servlet.service() for servlet [johnson-data-servlet] in context with path [] threw exception
java.lang.NullPointerException
at com.atlassian.confluence.health.LegacyJohnsonEventSerializer.toJson(LegacyJohnsonEventSerializer.java:29)
at com.atlassian.confluence.health.JohnsonEventCollectionSerializer.serializeEvent(JohnsonEventCollectionSerializer.java:46)
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1374)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
[...]
