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

Wed Nov 11 11:15:38 EST 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.

View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4265092#4265092

Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4265092