I run a JMX client application and get the following error in the servicemix console.

Any ideas? Cause?

smx@root:osgi> javax.management.openmbean.KeyAlreadyExistsException: Argument value's index, calculated according to this TabularData instance's tabularType, already refers to a value in this table.
        at javax.management.openmbean.TabularDataSupport.checkValueAndIndex(TabularDataSupport.java:871)
        at javax.management.openmbean.TabularDataSupport.internalPut(TabularDataSupport.java:331)
        at javax.management.openmbean.TabularDataSupport.put(TabularDataSupport.java:323)
        at org.osgi.jmx.codec.OSGiPackage.tableFrom(OSGiPackage.java:114)
        at com.oracle.osgi.jmx.core.PackageState.getPackages(PackageState.java:98)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:93)
        at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:27)
        at com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:208)
        at com.sun.jmx.mbeanserver.PerInterface.getAttribute(PerInterface.java:65)
        at com.sun.jmx.mbeanserver.MBeanSupport.getAttribute(MBeanSupport.java:216)
        at javax.management.StandardMBean.getAttribute(StandardMBean.java:358)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:666)
        at com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:638)
        at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1403)
        at javax.management.remote.rmi.RMIConnectionImpl.access$200(RMIConnectionImpl.java:72)
        at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1264)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1366)
        at javax.management.remote.rmi.RMIConnectionImpl.getAttribute(RMIConnectionImpl.java:600)
        at sun.reflect.GeneratedMethodAccessor106.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:305)
        at sun.rmi.transport.Transport$1.run(Transport.java:159)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619) 

Here is the JMX Client debug info that cause this exception.

// objName.toString() = "osgi.core:type=packageState"
"objName"= ObjectName  (id=36)     
     _Empty_property_array= ObjectName$Property[0]  (id=169)     
     compat= false     
     newSerialPersistentFields= ObjectStreamField[0]  (id=170)     
     newSerialVersionUID= 1081892073854801359     
     oldSerialPersistentFields= ObjectStreamField[6]  (id=173)     
     oldSerialVersionUID= -5467795090068647408     
     serialPersistentFields= ObjectStreamField[0]  (id=170)     
     serialVersionUID= 1081892073854801359     
"attrs"= MBeanAttributeInfo[1]  (id=87)     
     [0]= MBeanAttributeInfo  (id=90)     
          attributeType= "javax.management.openmbean.TabularData" (id=101)     
          description= "Attribute exposed for management" (id=102)     
          descriptor= ImmutableDescriptor  (id=103)     
          is= false     
          isRead= true     
          isWrite= false     
          name= "Packages" (id=110)     

// java call 
Object obj = conn.getAttribute(objName, attrs[i].getName());