Remote MBeans in Visual Administrator

[Former Member]

Is it possible to register an MBean remotely, and have it accessible via the Visual Administrator? (and shouldn't I see the bean using the monitoring service whether I extend BroadcastingStandardMBeanWrapper or not?)

I've been through 3 or 4 iterations now, but here's a snippet of what I'm looking at currently.

MBeanServerConnection mbsc = m.connect();
String pathInTheTree = "/Applications/Remote JMX";
		
/* Create the Hello World MBean */
Hello mbean = new Hello();

ObjectName cl = ObjectNameFactory.getNameForClassLoader("sap.com/myclassloader", null, null);

Properties p = new Properties();
p.setProperty("admin.path", "/Cluster/MyMBean");
p.setProperty("admin.displayName", "MyMBean");

BroadcastingStandardMBeanWrapper wrapper = new BroadcastingStandardMBeanWrapper(mbean, null, p);

ObjectName name = ObjectNameFactory.getNameForServerChildPerNode(ObjectName.quote(pathInTheTree), wrapper.getClass().getName(), null, null);

if (mbsc.isRegistered(name)) {
    mbsc.unregisterMBean(name);
}
mbsc.createMBean(wrapper.getClass().getName(), name, cl);

Which yields the following stack trace:

Exception in thread "main" javax.management.ReflectionException
	at com.sap.engine.services.jmx.MBeanServerConnectionImpl.invokeMbsInternal(MBeanServerConnectionImpl.java:523)
	at com.sap.engine.services.jmx.MBeanServerConnectionImpl.createMBean(MBeanServerConnectionImpl.java:128)
	at com.example.mbeans.Main.main(Main.java:57)
Caused by: java.lang.NoSuchMethodException: com.sap.engine.services.basicadmin.mbean.BroadcastingStandardMBeanWrapper.<init>()
	at java.lang.Class.getConstructor0(Class.java:1937)
	at java.lang.Class.getConstructor(Class.java:1027)
	at com.sap.engine.services.jmx.CompletionInterceptor.instantiate(CompletionInterceptor.java:632)
	at com.sap.engine.services.jmx.CompletionInterceptor.createMBean(CompletionInterceptor.java:272)
	at com.sap.engine.services.jmx.CompletionInterceptor.createMBean(CompletionInterceptor.java:250)
	at com.sap.pj.jmx.server.interceptor.BasicMBeanServerInterceptor.createMBean(BasicMBeanServerInterceptor.java:94)
	at com.sap.engine.services.jmx.RedirectInterceptor.createMBean(RedirectInterceptor.java:157)
	at com.sap.pj.jmx.server.interceptor.MBeanServerInterceptorChain.createMBean(MBeanServerInterceptorChain.java:202)
	at com.sap.engine.services.jmx.MBeanServerSecurityWrapper.createMBean(MBeanServerSecurityWrapper.java:210)
	at com.sap.engine.services.jmx.MBeanServerInvoker.invokeMbs(MBeanServerInvoker.java:102)
	at com.sap.engine.services.jmx.ClusterInterceptor.invokeMbs(ClusterInterceptor.java:212)
	at com.sap.engine.services.jmx.ClusterInterceptor.createMBean(ClusterInterceptor.java:391)
	at com.sap.engine.services.jmx.MBeanServerInterceptorInvoker.invokeMbs(MBeanServerInterceptorInvoker.java:75)
	at com.sap.engine.services.jmx.connector.p4.P4ConnectorServerImpl.invokeMbs(P4ConnectorServerImpl.java:61)
	at com.sap.engine.services.jmx.connector.p4.P4ConnectorServerImplp4_Skel.dispatch(P4ConnectorServerImplp4_Skel.java:64)
	at com.sap.engine.services.rmi_p4.DispatchImpl._runInternal(DispatchImpl.java:320)
	at com.sap.engine.services.rmi_p4.DispatchImpl._run(DispatchImpl.java:198)
	at com.sap.engine.services.rmi_p4.server.P4SessionProcessor.request(P4SessionProcessor.java:129)
	at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:33)
	at com.sap.engine.core.cluster.impl6.session.MessageRunner.run(MessageRunner.java:41)
	at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
	at java.security.AccessController.doPrivileged(Native Method)
	at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:100)
	at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:170)

This seems to be due to the absence of a no-arg contructor (which is not required by the spec, IIUC), so I hacked around that by wrapping the wrapper (aack) and delegating method invocations appropriately... This runs normally, but I still don't see my MBeans in the visual admin console.

Thoughts, anyone?

TIA,

Bill

[Former Member]

Figured it out myself. Was using the wrong MBeanServerConnection.createMBean method - the one that tries to instantiate the mbean with a no-arg constructor. <:-|

Should have been:

Hello mbean = new Hello();

...

Object[] params = new Object[] { mbean, HelloMBean.class, p };
String[] sig = new String[] { "java.lang.Object", "java.lang.Class", "java.util.Properties" };
mbsc.createMBean(wrapperClass, objectName, classloaderName, params, sig);