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Posted to users@tomcat.apache.org by Steve Cohen <sc...@javactivity.org> on 2008/09/04 19:40:11 UTC
Need help with Tomcat MBean support
I am trying to write a custom MBean to put a particular function of our
application under management control This application is currently
deployed under Tomcat 6.0.
I do not need remote monitoring/management. Local management will do.
I am perfectly happy to invoke my management function through a shell
script invoking a java jmx client to perform the action required.
I find the Tomcat documentation on this subject confusing and sparse.
The howto page here:
http://tomcat.apache.org/tomcat-6.0-doc/mbeans-descriptor-howto.html
simply shows a sample configuration file without explaining which
elements on it are required, which pertain to the specific example, etc.
Is there a standard syntax for these mbean descriptor files with a true
explanation of each field?
Also, compared to the standard Sun JMX tutorial - which elements does
Tomcat provide - server, agent ?
Thanks.
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Re: Need help with Tomcat MBean support
Posted by Steve Cohen <sc...@javactivity.org>.
Soon as I get out of this time crunch I will try to do so.
Mark Thomas wrote:
> Steve Cohen wrote:
>
>> Thank you very much - this is exactly what I was looking for.
>>
>> And a word to the Tomcat team -
>>
>> Documentation would be much improved by simply mentioning the two links
>> provided by Mr. Hall.
>>
>
> Patches are always welcome.
>
> Mark
>
>
>
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>
>
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Re: Need help with Tomcat MBean support
Posted by Mark Thomas <ma...@apache.org>.
Steve Cohen wrote:
> Thank you very much - this is exactly what I was looking for.
>
> And a word to the Tomcat team -
>
> Documentation would be much improved by simply mentioning the two links
> provided by Mr. Hall.
Patches are always welcome.
Mark
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Re: Need help with Tomcat MBean support
Posted by Steve Cohen <sc...@javactivity.org>.
Thank you very much - this is exactly what I was looking for.
And a word to the Tomcat team -
Documentation would be much improved by simply mentioning the two links
provided by Mr. Hall.
H. Hall wrote:
> Steve Cohen wrote:
>> I am trying to write a custom MBean to put a particular function of
>> our application under management control This application is
>> currently deployed under Tomcat 6.0.
>>
>> I do not need remote monitoring/management. Local management will
>> do. I am perfectly happy to invoke my management function through a
>> shell script invoking a java jmx client to perform the action required.
>>
>> I find the Tomcat documentation on this subject confusing and
>> sparse. The howto page here:
>> http://tomcat.apache.org/tomcat-6.0-doc/mbeans-descriptor-howto.html
>>
>> simply shows a sample configuration file without explaining which
>> elements on it are required, which pertain to the specific example, etc.
>>
>> Is there a standard syntax for these mbean descriptor files with a
>> true explanation of each field?
>>
> I believe it's based on the Apache Commons Modeler.
> Here is a link to the DTD for the Model MBeans Configuration File:
> http://jakarta.apache.org/commons/dtds/mbeans-descriptors.dtd
>
> Here is a link for the java doc for package
> org.apache.tomcat.util.modeler. Scroll down to description:
> http://tomcat.apache.org/tomcat-6.0-doc/api/org/apache/tomcat/util/modeler/package-summary.html
>
>
> cheers,
> HH
>
>
>> Also, compared to the standard Sun JMX tutorial - which elements does
>> Tomcat provide - server, agent ?
>>
>> Thanks.
>>
>>
>
>
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Re: Need help with Tomcat MBean support
Posted by Steve Cohen <sc...@javactivity.org>.
Thanks again. These articles are very clear and simple.
They do raise a couple questions, though.
In the first article, no mention is made of an mbeans-descriptor.xml
file. It's all done programatically in the first article - which might
be fine for my needs. The Tomcat documentation does make it sound as
though you can drop the xml file into your MBean package directory and
something provided by Tomcat picks it up and makes the MBean accessible,
but it now seems that this is not the case.
The second article shows code to read these XML files (
CommonsModelMBeanDemonstrator.applyCommonsModeler() ) which leads me to
ask whether Tomcat comes with commons-modeler support built-in or
whether this must be added manually as in this sample.
Anyway, it appears that there are two approaches here
1 - do everything programatically, in which case the .xml file isn't needed
2 - use the commons-modeler xml-file approach (question remains what
support, if any, Tomcat provides for this).
Do I have this right?
H. Hall wrote:
> Steve Cohen wrote:
>> Let me ask my question a little more directly:
>>
>> Does the presence of a descriptor cause instantiation of an instance
>> of an MBean
>> or do I have to write code to create a server-side instance of my
>> MBean and if so, where should this code reside
>> or is there some configuration artifact that causes this
>> instantiation to happen?
>>
>>
>
> Why don't you take a look at these two articles:
> http://today.java.net/pub/a/today/2005/11/15/using-jmx-to-manage-web-applications.html?page=1
>
>
> http://marxsoftware.blogspot.com/2008/07/jmx-model-mbeans-with-apache-commons.html
>
>
> If you use the NetBeans IDE you might be interested in the JMX plugin
> for NB. Here is a link to a tutorial "Getting Started with JMX
> Monitoring in NetBeans IDE 6.0"
>
> http://www.netbeans.org/kb/60/java/jmx-getstart.html
>
> cheers,
> HH
>
>
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Re: Need help with Tomcat MBean support - SOLVED
Posted by Steve Cohen <sc...@javactivity.org>.
Finally figured out how to do what I wanted to do.
Turns out I had no need at all of creating an MBean in my client. Duh!
I never understood why I needed to do that but that is what the sample did.
All I needed to do was call the MBeanServerConnection.invoke() method
with a suitable object name and other params to invoke the operation on
the MBean I had ALREADY instantiated on my server.
That's what you get for slavishly following example code instead of
thinking.
By the way I found this out by staring at the Ant examples on
http://tomcat.apache.org/tomcat-6.0-doc/monitoring.html. I finally
realized that if Ant can invoke an operation, so could a non-Ant
executable. From there a simple peek at the jmx ant task source code
showed me what I needed to do. Voila!
Gotta love open source - once you figure out where to look.
Thank you to all who helped.
Steve Cohen wrote:
> I sent this in over the weekend and didn't get a response so let me
> try this again a bit differently.
>
> The Sun JDK 5.0 JMX tutorial shows that it is possible and simple to
> create JMX client and JMX server in separate JVMs and have them talk
> to each other.
>
> The first article cited by Mr. Hall shows that it is possible and
> simple to create a JMX server running inside Tomcat and talk to it
> through tools such as MC4J and JManage.
>
> I need to combine the Server side approach recommended by the article
> (JMX server within Tomcat webapp) with the Client side approach
> recommended by Sun in their tutorial.
> So far my client-side app can connect to the MBean server inside of
> Tomcat and talk to it but it fails to create the MBean needed to
> interact with the server because of ClassLoader issues.
>
> Questions: 1. Is this even possible? It would seem to be so since
> MC4J and JManage know how to do it.
> 2. If so, how do I surmount these ClassLoader issues?
>
> Thank you very much.
>
> Steve Cohen wrote:
>> Okay using approach of first article. The MBean server is correctly
>> initialized and everything on the server side looks good.
>>
>> Now we come to the client side. The first article assumes you are
>> just going to connect using a tool such as MC4J or JManage
>> (monitoring tools).
>>
>> That is not my use case. I want to write a command-line client that
>> can talk to the MBean (which is inside of Tomcat) and invoke an
>> operation on the MBean.
>>
>> I use the Client.java sample from the Sun tutorial as a starting point.
>>
>> I am able to connect to the server, and get a list of MBeans, but I
>> fail when trying to call createMBean(). I am using the simple
>> two-parameter version of createMBean() and it always fails with
>>
>> javax.management.ReflectionException: The MBean class could not be
>> loaded by the default loader repository
>>
>> It seems pretty clear that my client needs to use one of the other
>> versions of createMBean(), one that specifies some other Class Loader
>> but I have no clue what I should be using for that.
>>
>>
>> H. Hall wrote:
>>> Steve Cohen wrote:
>>>> Let me ask my question a little more directly:
>>>>
>>>> Does the presence of a descriptor cause instantiation of an
>>>> instance of an MBean
>>>> or do I have to write code to create a server-side instance of my
>>>> MBean and if so, where should this code reside
>>>> or is there some configuration artifact that causes this
>>>> instantiation to happen?
>>>>
>>>>
>>>
>>> Why don't you take a look at these two articles:
>>> http://today.java.net/pub/a/today/2005/11/15/using-jmx-to-manage-web-applications.html?page=1
>>>
>>>
>>> http://marxsoftware.blogspot.com/2008/07/jmx-model-mbeans-with-apache-commons.html
>>>
>>>
>>> If you use the NetBeans IDE you might be interested in the JMX
>>> plugin for NB. Here is a link to a tutorial "Getting Started with
>>> JMX Monitoring in NetBeans IDE 6.0"
>>>
>>> http://www.netbeans.org/kb/60/java/jmx-getstart.html
>>>
>>> cheers,
>>> HH
>>>
>>>
>>
>>
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>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
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>>
>>
>>
>
>
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Re: Need help with Tomcat MBean support
Posted by Steve Cohen <sc...@javactivity.org>.
I sent this in over the weekend and didn't get a response so let me try
this again a bit differently.
The Sun JDK 5.0 JMX tutorial shows that it is possible and simple to
create JMX client and JMX server in separate JVMs and have them talk to
each other.
The first article cited by Mr. Hall shows that it is possible and simple
to create a JMX server running inside Tomcat and talk to it through
tools such as MC4J and JManage.
I need to combine the Server side approach recommended by the article
(JMX server within Tomcat webapp) with the Client side approach
recommended by Sun in their tutorial.
So far my client-side app can connect to the MBean server inside of
Tomcat and talk to it but it fails to create the MBean needed to
interact with the server because of ClassLoader issues.
Questions:
1. Is this even possible? It would seem to be so since MC4J and JManage
know how to do it.
2. If so, how do I surmount these ClassLoader issues?
Thank you very much.
Steve Cohen wrote:
> Okay using approach of first article. The MBean server is correctly
> initialized and everything on the server side looks good.
>
> Now we come to the client side. The first article assumes you are
> just going to connect using a tool such as MC4J or JManage (monitoring
> tools).
>
> That is not my use case. I want to write a command-line client that
> can talk to the MBean (which is inside of Tomcat) and invoke an
> operation on the MBean.
>
> I use the Client.java sample from the Sun tutorial as a starting point.
>
> I am able to connect to the server, and get a list of MBeans, but I
> fail when trying to call createMBean(). I am using the simple
> two-parameter version of createMBean() and it always fails with
>
> javax.management.ReflectionException: The MBean class could not be
> loaded by the default loader repository
>
> It seems pretty clear that my client needs to use one of the other
> versions of createMBean(), one that specifies some other Class Loader
> but I have no clue what I should be using for that.
>
>
> H. Hall wrote:
>> Steve Cohen wrote:
>>> Let me ask my question a little more directly:
>>>
>>> Does the presence of a descriptor cause instantiation of an instance
>>> of an MBean
>>> or do I have to write code to create a server-side instance of my
>>> MBean and if so, where should this code reside
>>> or is there some configuration artifact that causes this
>>> instantiation to happen?
>>>
>>>
>>
>> Why don't you take a look at these two articles:
>> http://today.java.net/pub/a/today/2005/11/15/using-jmx-to-manage-web-applications.html?page=1
>>
>>
>> http://marxsoftware.blogspot.com/2008/07/jmx-model-mbeans-with-apache-commons.html
>>
>>
>> If you use the NetBeans IDE you might be interested in the JMX plugin
>> for NB. Here is a link to a tutorial "Getting Started with JMX
>> Monitoring in NetBeans IDE 6.0"
>>
>> http://www.netbeans.org/kb/60/java/jmx-getstart.html
>>
>> cheers,
>> HH
>>
>>
>
>
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>
>
>
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Re: Need help with Tomcat MBean support
Posted by Steve Cohen <sc...@javactivity.org>.
Okay using approach of first article. The MBean server is correctly
initialized and everything on the server side looks good.
Now we come to the client side. The first article assumes you are just
going to connect using a tool such as MC4J or JManage (monitoring tools).
That is not my use case. I want to write a command-line client that can
talk to the MBean (which is inside of Tomcat) and invoke an operation on
the MBean.
I use the Client.java sample from the Sun tutorial as a starting point.
I am able to connect to the server, and get a list of MBeans, but I fail
when trying to call createMBean(). I am using the simple two-parameter
version of createMBean() and it always fails with
javax.management.ReflectionException: The MBean class could not be
loaded by the default loader repository
It seems pretty clear that my client needs to use one of the other
versions of createMBean(), one that specifies some other Class Loader
but I have no clue what I should be using for that.
H. Hall wrote:
> Steve Cohen wrote:
>> Let me ask my question a little more directly:
>>
>> Does the presence of a descriptor cause instantiation of an instance
>> of an MBean
>> or do I have to write code to create a server-side instance of my
>> MBean and if so, where should this code reside
>> or is there some configuration artifact that causes this
>> instantiation to happen?
>>
>>
>
> Why don't you take a look at these two articles:
> http://today.java.net/pub/a/today/2005/11/15/using-jmx-to-manage-web-applications.html?page=1
>
>
> http://marxsoftware.blogspot.com/2008/07/jmx-model-mbeans-with-apache-commons.html
>
>
> If you use the NetBeans IDE you might be interested in the JMX plugin
> for NB. Here is a link to a tutorial "Getting Started with JMX
> Monitoring in NetBeans IDE 6.0"
>
> http://www.netbeans.org/kb/60/java/jmx-getstart.html
>
> cheers,
> HH
>
>
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Re: Need help with Tomcat MBean support
Posted by "H. Hall" <hh...@reedyriver.com>.
Steve Cohen wrote:
> Let me ask my question a little more directly:
>
> Does the presence of a descriptor cause instantiation of an instance
> of an MBean
> or do I have to write code to create a server-side instance of my
> MBean and if so, where should this code reside
> or is there some configuration artifact that causes this instantiation
> to happen?
>
>
Why don't you take a look at these two articles:
http://today.java.net/pub/a/today/2005/11/15/using-jmx-to-manage-web-applications.html?page=1
http://marxsoftware.blogspot.com/2008/07/jmx-model-mbeans-with-apache-commons.html
If you use the NetBeans IDE you might be interested in the JMX plugin
for NB. Here is a link to a tutorial "Getting Started with JMX
Monitoring in NetBeans IDE 6.0"
http://www.netbeans.org/kb/60/java/jmx-getstart.html
cheers,
HH
> Steve Cohen wrote:
>> H. Hall wrote:
>>
>> Okay, thanks again. This got me off square one. Now on to square
>> two. :-)
>>
>> 1. I compose a legal mbeans-descriptor.xml file configuring my MBean
>> according to DTD. I place it in the domain "Catalina". Don't know
>> if this is right. Also tried my own domain name.
>> 2. I launch Tomcat with parameters sufficient to launch JMX, define a
>> port
>> etc. This works.
>>
>> 3. I modify the simple Client.java from the Sun tutorial modifying
>> the url to talk to my port and the jmxrmi context. This succeeds to
>> the point of letting me iterate the list of available domain names.
>> 4, When I use the version of the descriptor with a custom Domain
>> name, this domain name does not even appear in the list and the
>> Client app fails with a ClassNotFoundException.
>>
>> 5. When I use the version of the descriptor that places my mbean in
>> the Catalina domain, my bean is not found within that Domain and the
>> Client app also fails - with a ClassNotFoundException.
>>
>> Is there a preexisting domain within Tomcat to which I should attach
>> my mbean? If not, what must I do to get my mbean found.
>>
>>
>>> Steve Cohen wrote:
>>>> I am trying to write a custom MBean to put a particular function of
>>>> our application under management control This application is
>>>> currently deployed under Tomcat 6.0.
>>>>
>>>> I do not need remote monitoring/management. Local management will
>>>> do. I am perfectly happy to invoke my management function through
>>>> a shell script invoking a java jmx client to perform the action
>>>> required.
>>>>
>>>> I find the Tomcat documentation on this subject confusing and
>>>> sparse. The howto page here:
>>>> http://tomcat.apache.org/tomcat-6.0-doc/mbeans-descriptor-howto.html
>>>>
>>>> simply shows a sample configuration file without explaining which
>>>> elements on it are required, which pertain to the specific example,
>>>> etc.
>>>>
>>>> Is there a standard syntax for these mbean descriptor files with a
>>>> true explanation of each field?
>>>>
>>> I believe it's based on the Apache Commons Modeler.
>>> Here is a link to the DTD for the Model MBeans Configuration File:
>>> http://jakarta.apache.org/commons/dtds/mbeans-descriptors.dtd
>>>
>>> Here is a link for the java doc for package
>>> org.apache.tomcat.util.modeler. Scroll down to description:
>>> http://tomcat.apache.org/tomcat-6.0-doc/api/org/apache/tomcat/util/modeler/package-summary.html
>>>
>>>
>>> cheers,
>>> HH
>>>
>>>
>>>> Also, compared to the standard Sun JMX tutorial - which elements
>>>> does Tomcat provide - server, agent ?
>>>>
>>>> Thanks.
>>>>
>>>>
>>>
>>>
>>
>>
>> ---------------------------------------------------------------------
>> To start a new topic, e-mail: users@tomcat.apache.org
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>>
--
H. Hall
ReedyRiver Group LLC
http://www.reedyriver.com
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Re: Need help with Tomcat MBean support
Posted by Steve Cohen <sc...@javactivity.org>.
Let me ask my question a little more directly:
Does the presence of a descriptor cause instantiation of an instance of
an MBean
or do I have to write code to create a server-side instance of my MBean
and if so, where should this code reside
or is there some configuration artifact that causes this instantiation
to happen?
Steve Cohen wrote:
> H. Hall wrote:
>
> Okay, thanks again. This got me off square one. Now on to square
> two. :-)
>
> 1. I compose a legal mbeans-descriptor.xml file configuring my MBean
> according to DTD. I place it in the domain "Catalina". Don't know if
> this is right. Also tried my own domain name.
> 2. I launch Tomcat with parameters sufficient to launch JMX, define a
> port
> etc. This works.
>
> 3. I modify the simple Client.java from the Sun tutorial modifying the
> url to talk to my port and the jmxrmi context. This succeeds to the
> point of letting me iterate the list of available domain names.
> 4, When I use the version of the descriptor with a custom Domain name,
> this domain name does not even appear in the list and the Client app
> fails with a ClassNotFoundException.
>
> 5. When I use the version of the descriptor that places my mbean in
> the Catalina domain, my bean is not found within that Domain and the
> Client app also fails - with a ClassNotFoundException.
>
> Is there a preexisting domain within Tomcat to which I should attach
> my mbean? If not, what must I do to get my mbean found.
>
>
>> Steve Cohen wrote:
>>> I am trying to write a custom MBean to put a particular function of
>>> our application under management control This application is
>>> currently deployed under Tomcat 6.0.
>>>
>>> I do not need remote monitoring/management. Local management will
>>> do. I am perfectly happy to invoke my management function through a
>>> shell script invoking a java jmx client to perform the action required.
>>>
>>> I find the Tomcat documentation on this subject confusing and
>>> sparse. The howto page here:
>>> http://tomcat.apache.org/tomcat-6.0-doc/mbeans-descriptor-howto.html
>>>
>>> simply shows a sample configuration file without explaining which
>>> elements on it are required, which pertain to the specific example,
>>> etc.
>>>
>>> Is there a standard syntax for these mbean descriptor files with a
>>> true explanation of each field?
>>>
>> I believe it's based on the Apache Commons Modeler.
>> Here is a link to the DTD for the Model MBeans Configuration File:
>> http://jakarta.apache.org/commons/dtds/mbeans-descriptors.dtd
>>
>> Here is a link for the java doc for package
>> org.apache.tomcat.util.modeler. Scroll down to description:
>> http://tomcat.apache.org/tomcat-6.0-doc/api/org/apache/tomcat/util/modeler/package-summary.html
>>
>>
>> cheers,
>> HH
>>
>>
>>> Also, compared to the standard Sun JMX tutorial - which elements
>>> does Tomcat provide - server, agent ?
>>>
>>> Thanks.
>>>
>>>
>>
>>
>
>
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>
>
>
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Re: Need help with Tomcat MBean support
Posted by Steve Cohen <sc...@javactivity.org>.
H. Hall wrote:
Okay, thanks again. This got me off square one. Now on to square two. :-)
1. I compose a legal mbeans-descriptor.xml file configuring my MBean
according to DTD. I place it in the domain "Catalina". Don't know if
this is right. Also tried my own domain name.
2. I launch Tomcat with parameters sufficient to launch JMX, define a port
etc. This works.
3. I modify the simple Client.java from the Sun tutorial modifying the
url to talk to my port and the jmxrmi context.
This succeeds to the point of letting me iterate the list of available
domain names.
4, When I use the version of the descriptor with a custom Domain name,
this domain name does not even appear in the list and the Client app
fails with a ClassNotFoundException.
5. When I use the version of the descriptor that places my mbean in the
Catalina domain, my bean is not found within that Domain and the Client
app also fails - with a ClassNotFoundException.
Is there a preexisting domain within Tomcat to which I should attach my
mbean? If not, what must I do to get my mbean found.
> Steve Cohen wrote:
>> I am trying to write a custom MBean to put a particular function of
>> our application under management control This application is
>> currently deployed under Tomcat 6.0.
>>
>> I do not need remote monitoring/management. Local management will
>> do. I am perfectly happy to invoke my management function through a
>> shell script invoking a java jmx client to perform the action required.
>>
>> I find the Tomcat documentation on this subject confusing and
>> sparse. The howto page here:
>> http://tomcat.apache.org/tomcat-6.0-doc/mbeans-descriptor-howto.html
>>
>> simply shows a sample configuration file without explaining which
>> elements on it are required, which pertain to the specific example, etc.
>>
>> Is there a standard syntax for these mbean descriptor files with a
>> true explanation of each field?
>>
> I believe it's based on the Apache Commons Modeler.
> Here is a link to the DTD for the Model MBeans Configuration File:
> http://jakarta.apache.org/commons/dtds/mbeans-descriptors.dtd
>
> Here is a link for the java doc for package
> org.apache.tomcat.util.modeler. Scroll down to description:
> http://tomcat.apache.org/tomcat-6.0-doc/api/org/apache/tomcat/util/modeler/package-summary.html
>
>
> cheers,
> HH
>
>
>> Also, compared to the standard Sun JMX tutorial - which elements does
>> Tomcat provide - server, agent ?
>>
>> Thanks.
>>
>>
>
>
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Re: Need help with Tomcat MBean support
Posted by "H. Hall" <hh...@reedyriver.com>.
Steve Cohen wrote:
> I am trying to write a custom MBean to put a particular function of
> our application under management control This application is
> currently deployed under Tomcat 6.0.
>
> I do not need remote monitoring/management. Local management will
> do. I am perfectly happy to invoke my management function through a
> shell script invoking a java jmx client to perform the action required.
>
> I find the Tomcat documentation on this subject confusing and sparse.
> The howto page here:
> http://tomcat.apache.org/tomcat-6.0-doc/mbeans-descriptor-howto.html
>
> simply shows a sample configuration file without explaining which
> elements on it are required, which pertain to the specific example, etc.
>
> Is there a standard syntax for these mbean descriptor files with a
> true explanation of each field?
>
I believe it's based on the Apache Commons Modeler.
Here is a link to the DTD for the Model MBeans Configuration File:
http://jakarta.apache.org/commons/dtds/mbeans-descriptors.dtd
Here is a link for the java doc for package
org.apache.tomcat.util.modeler. Scroll down to description:
http://tomcat.apache.org/tomcat-6.0-doc/api/org/apache/tomcat/util/modeler/package-summary.html
cheers,
HH
> Also, compared to the standard Sun JMX tutorial - which elements does
> Tomcat provide - server, agent ?
>
> Thanks.
>
>
--
H. Hall
ReedyRiver Group LLC
http://www.reedyriver.com
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