[Management Development] - Simple Example using ManagedObjects and ProfileService - jboss-dev-forums

Wednesday, 11 November 2009

Hi,

I am trying to write a simple example to see how a service defined with @ManagedObject
annotation in the JBossAS and then access it using the ProfileService. I wrote below
sample code

Service in JBoss AS

  | @ManagementObject(name="MyService")
  | @ManagementComponent(type="foo", subtype="service")
  | public class MyService  {
  | 
  | 	private String value = "property value";
  | 	
  | 	public void start() {
  | 		System.out.println("Myservice has been started");
  | 	}
  | 
  | 	public void stop() {
  | 		System.out.println("Myservice has been shut down");
  | 	}
  | 	
  | 	@ManagementProperty(name="Myservice.value")
  | 	public String getValue() {
  | 		return this.value;
  | 	}
  | 	
  | 	@ManagementOperation(description="Call me", impact=Impact.ReadOnly,
params={@ManagementParameter(name="message", description="message to
invoke")})
  | 	public String callMe(String msg) {
  | 		System.out.println("Somebody called me = "+msg);
  | 		return msg + "called";
  | 	}
  | }
  | 

I bundled the above in to jar file and deployed into JBossAS. Then to access it, I wrote a
simple JSP page like this

  | <%@ page import="org.jboss.deployers.spi.management.*,
org.jboss.managed.api.*, javax.naming.*, java.util.*,
org.jboss.metatype.api.values.*" %>
  | <HTML>
  |     <BODY>
  |     <%
  |         InitialContext ic = new InitialContext();
  |         ManagementView mgtView =
(ManagementView)ic.lookup("java:ManagementView");
  |         ManagedComponent mc = mgtView.getComponent("MyService", new
ComponentType("foo", "service"));
  |         
  |         SimpleValueSupport result = null;     
  | 		Set<ManagedOperation> operations = mc.getOperations();
  | 		for (ManagedOperation op:operations) {
  | 			if (op.getName().equals("callMe")) {
  | 				result = (SimpleValueSupport)op.invoke(SimpleValueSupport.wrap("*"));
  | 			}
  | 		}
  |     %>
  |     Response from call is = <%= result.getValue() %>
  |     </TABLE>
  |     </BODY>
  | </HTML>
  | 

When I execute this, I always end up in NPE on the response. I see the metadata on the
object like its operations and properties etc, but not seemed to access the property
values or invoke operations. I think I may be missing some step, can somebody please help
or point toward a example?

I looked in "admin-console" code, but I did not see any difference from above.

Thank you.

Ramesh..
Teiid Team.

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[Management Development] - Simple Example using ManagedObjects and ProfileService