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Yogesh,
On 8/5/14, 10:18 AM, Yogesh Rao wrote:
> I am trying to write a MBean using the Modeler API in tomcat. The
> details of my environment are as below:-
>
> Tomcat version : 7.0.54 JDK version : 1.7 OS : windows 7
>
> The MBean written using Modeler API is not getting deployed and
> hence not showing up on JConsole. Following is the simple MBean
> code which has been written with its mbeans-descriptors.xml
>
> HelloMBean.java -------------------------
>
> package com.example.mbean;
>
> public interface HelloMBean {
>
> void sayHello(); }
>
>
> Hello.java --------------------------- package com.example.mbean;
>
> import javax.management.MBeanException; import
> javax.management.RuntimeOperationsException;
>
> import org.apache.catalina.mbeans.MBeanUtils; import
> org.apache.tomcat.util.modeler.BaseModelMBean; import
> org.apache.tomcat.util.modeler.ManagedBean; import
> org.apache.tomcat.util.modeler.Registry;
>
> public class Hello extends BaseModelMBean implements HelloMBean {
>
>
> protected Registry registry = MBeanUtils.createRegistry();
> protected ManagedBean managed =
> registry.findManagedBean("Custom");
>
> protected Hello() throws MBeanException, RuntimeOperationsException
> { super(); }
>
> @Override public void sayHello() {
> System.out.println("sayHello()"); }
>
> }
>
> mbeans-descriptors.xml ------------------------------ <?xml
> version="1.0"?> <mbeans-descriptors> <mbean name="Custom"
> className="com.example.mbean.Hello" description="Custom Hello"
> domain="Catalina" group="Custom"
> type="com.example.mbean.HelloMBean">
>
> <operation name="sayHello" description="Saying Hello"
> impact="ACTION" returnType="void"> </operation> </mbean>
> </mbeans-descriptors>
>
>
> All the above files are in the same package and bundled as jar. I
> have tried placing this jar in server\lib directory as well as in a
> webapp.
>
> Sadly there is very little documentation on how to go about writing
> a MBean using this API.
>
> Any help on this would be greatly appreciated.
I never had any luck getting Tomcat to auto-load my beans: I had to
load them myself by manually-registering the bean with the local server.
Take a look at my presentation from ApacheCon NA 2014:
http://people.apache.org/~schultz/ApacheCon%20NA%202014/Monitoring%20Apache%20Tomcat%20with%20JMX.pdf
Check page 28 for a slide containing code where I manually-register
the bean. Note that I don't use any Tomcat-specific APIs.
I keep forgetting that I never posted the full source code, etc. for
my presentation. I really need to do that...
- -chris
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