NULLPointer on startup

[Florian Dorfhuber]

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)
[...]

[Gonchik Tsymzhitov · Accepted solution]

Hi Florian,


Usually those NullPointers are generic, and doesn't give a full picture of the problem. May I ask you, if you can reach Confluence's database through Confluence's box?

To rule out a problem with the plugins during the startup, can you please do the following steps to clean the plugin cache?

* Shutdown Confluence
Delete the content from the following folders:
     <confluence-home>/plugin-cache
     <confluence-home>/plugins-osgi-cache 
     <confluence-home>/plugins-temp
     <confluence-install-dir>/work/* 
* Startup Confluence

And better way is read https://confluence.atlassian.com/doc/upgrade-notes-overview-176882813.html

OR double check you config files like, init.properties, setenv.sh, server.xml, confluence.db.xml. and check owners for home and installation directories

I hope this helps.

Cheers,

Gonchik Tsymzhitov

[Florian Dorfhuber]

Hey Gonchik,

thanks for your fast answer. It worked fine.

The main problem were insuffizient provided CPUs by the hoster, which caused that many errors.

Best wishes,
Flo