NullPointerException while invoking browse operation on a queue through JMX using the java code

Issue

• Developed a bundle to monitor our broker, we want to browse a queue with the following code:

MBeanServer server = ManagementFactory.getPlatformMBeanServer();
CompositeData[] messages = (CompositeData[]) server.invoke(queue, "browse", null, null);

• When we execute this code in the bundle, we get:

java.lang.NullPointerException
        at org.apache.activemq.broker.jmx.AnnotatedMBean.invoke(AnnotatedMBean.java:197)
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)[:1.8.0_121]
        at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)[:1.8.0_121]
        at javax.management.MBeanServerInvocationHandler.invoke(MBeanServerInvocationHandler.java:298)[:1.8.0_121]
        at com.sun.proxy.$Proxy48.browse(Unknown Source)