[CASSANDRA-12869] Don't load mx4j beans twice

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 3.10
• Component/s: Legacy/Core
• Severity: Normal
• Assignee: Eduard Tudenhoefner
• Reporter: Eduard Tudenhoefner

Authors

Eduard Tudenhoefner

Reviewers

Robert Stupp

• Created: 02/Nov/16 08:29
• Updated: 16/Apr/19 09:30
• Resolved: 02/Nov/16 18:27

Description

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.

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]

Issue Links

• links to: GitHub Pull Request 81
• links to: GitHub Pull Request #80