RHQ JMX plugin failed to get measurement values

We are not able to monitor cache statistics due to this error. RHQ agents are reporting:

2014-05-21 05:54:24,958 WARN [MeasurementManager.collector-1] (rhq.core.pc.measurement.MeasurementCollectorRunner)- Failure to collect measurement data for Resource[id=10774, uuid=9f67384f-8f53-4a25-a138-13c54b32c6df, type=

Infinispan Cache, key="__default(dist_sync)", name=__default(dist_sync), parent=DefaultCacheManager] - cause: java.lang.NullPointerException:null

2014-05-21 05:55:32,013 ERROR [WorkerThread#1[10.16.23.98:59988]] (rhq.core.pc.measurement.MeasurementManager)- Could not get measurement values
java.lang.NullPointerException
at org.rhq.plugins.jmx.MBeanResourceComponent.getEmsConnection(MBeanResourceComponent.java:574)
at org.infinispan.rhq.CacheComponent.getValues(CacheComponent.java:97)
at sun.reflect.GeneratedMethodAccessor71.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.rhq.core.pc.inventory.ResourceContainer$ComponentInvocation.call(ResourceContainer.java:654)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:679)