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From Yogesh Rao <yog...@gmail.com>
Subject Re: Unable to deploy MBeans in Tomcat 7 using Modeler API
Date Wed, 06 Aug 2014 00:49:32 GMT
Hi chris,

Thank you for the quick reply. I will certainly look at the link mentioned
by you... Also let me know if you planning to upload the source code
anytime soon.

Meanwhile any tomcat developers on the mailing list can help me with this
???

I can slso volunteer in contributing to this part of the documentation.

Regards,
-yogesh

On Wednesday, August 6, 2014, Christopher Schultz <
chris@christopherschultz.net> wrote:

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> Hash: SHA256
>
> 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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