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https://issues.apache.org/jira/browse/CASSANDRA-12869?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Eduard Tudenhoefner updated CASSANDRA-12869:
--------------------------------------------
    Status: Awaiting Feedback  (was: In Progress)

> Don't load mx4j beans twice
> ---------------------------
>
>                 Key: CASSANDRA-12869
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12869
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Eduard Tudenhoefner
>            Assignee: Eduard Tudenhoefner
>
> This happens on *cassandra-3.X* and *trunk* because there are two calls to 
> {{Mx4jTool.maybeLoad()}}. I think this was an unintentional side-effect of 
> merging CASSANDRA-12274
> upstream.
> {code}
> WARN  [main] 2016-11-02 09:07:09,294 Mx4jTool.java:72 - Could not start 
> register mbean in JMX
> javax.management.InstanceAlreadyExistsException: system:name=http
>       at com.sun.jmx.mbeanserver.Repository.addMBean(Repository.java:437) 
> ~[na:1.8.0_91]
>       at 
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerWithRepository(DefaultMBeanServerInterceptor.java:1898)
>  ~[na:1.8.0_91]
>       at 
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerDynamicMBean(DefaultMBeanServerInterceptor.java:966)
>  ~[na:1.8.0_91]
>       at 
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerObject(DefaultMBeanServerInterceptor.java:900)
>  ~[na:1.8.0_91]
>       at 
> com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:324)
>  ~[na:1.8.0_91]
>       at 
> com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522) 
> ~[na:1.8.0_91]
>       at org.apache.cassandra.utils.Mx4jTool.maybeLoad(Mx4jTool.java:55) 
> ~[main/:na]
>       at 
> org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:414) 
> [main/:na]
>       at 
> org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:603)
>  [main/:na]
>       at 
> org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:737) 
> [main/:na]
> {code}



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