[infinispan-issues] [JBoss JIRA] (ISPN-11884) Exceptions when getting various attributes from a registered MBean

[David Maplesden (Jira)]

David Maplesden created ISPN-11884:
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             Summary: Exceptions when getting various attributes from a registered MBean
                 Key: ISPN-11884
                 URL: https://issues.redhat.com/browse/ISPN-11884
             Project: Infinispan
          Issue Type: Bug
          Components: JMX, reporting and management
    Affects Versions: 10.1.8.Final
            Reporter: David Maplesden


When trying to inspect some of the monitoring and reporting statistics exposed by infinispan via JMX we are getting an error retrieving some of the attributes.

The only objects we are getting errors from are of type {{org.infinispan.interceptors.impl.CacheMgmtInterceptor}}

The attributes:
* hitTimes
* missTimes
* storeTimes
* removeTimes
cause {{NullPointerException}}  and the attribute
* statisticsEnabled
causes {{java.lang.IllegalArgumentException: wrong number of arguments}}

Debugging the issue it looks to me like the problem is with the way {{ResourceDMBean}} is discovering the getters for these attributes.  For the first 4 attributes there are setters but no getter methods, so no method is found and we get the NPE.  For the last attribute the code in {{ReflectionUtil.findGetterForFieldUsingReflection()}} just looks for a method with the correct name without checking the number of arguments, so it is finding the {{org.infinispan.interceptors.impl.CacheMgmtInterceptor.getStatisticsEnabled(FlagAffectedCommand)}} method instead of the {{org.infinispan.interceptors.impl.JmxStatsCommandInterceptor.getStatisticsEnabled()}} from the superclass. 



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