perfSONAR User Q&A and Other Discussion

[Kyle Hutson <>]

Background: everything we had setup for a central dashboard broke when the auto-upgrade to version 5 happened last April. I thought I'd be clever and bring up the base OS to something that wasn't being deprecated in the next year while I was messing with it (namely Alma 9). I think I have several issues, but I'll start with one I can clearly articulate...

When I run 'systemctl restart maddash-server', it looks happy for several seconds and then fails.

/var/log/maddash/maddash-server.out reveals many 'JarClassLoader' warnings - I'm guessing those are advisory only. I have 365 lines of those.

Those are followed by these lines:

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
MLog initialization issue: slf4j found no binding or threatened to use its (dangerously silent) NOPLogger. We consider the slf4j library not found.
Initialization error: java.lang.String cannot be cast to java.util.Map
java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Map
        at net.es.maddash.MaDDashGlobals.configureDashboards(MaDDashGlobals.java:372)
        at net.es.maddash.MaDDashGlobals.load(MaDDashGlobals.java:301)
        at net.es.maddash.MaDDashGlobals.<init>(MaDDashGlobals.java:188)
        at net.es.maddash.MaDDashGlobals.getInstance(MaDDashGlobals.java:520)
        at net.es.maddash.Invoker.main(Invoker.java:55)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at com.simontuffs.onejar.Boot.run(Boot.java:340)
        at com.simontuffs.onejar.Boot.main(Boot.java:166)

Looking for files containing 'slf4j; reveals files in

- /usr/share/logstash/logstash-core/lib/jars

- /usr/share/logstash/vendor/bundle/jruby/2.5.0/gems

- /usr/share/opensearch/plugins/opensearch-*

Any clues on how to get this piece running?