From: aidy <aidy.lewis@...>
Date: 2010-08-05T01:45:12+09:00
Subject: Re: jmx4r metaprogramming

Hi Jeff

jmx4r is a pretty useful library.

> This error is strange, there should not be a white space between
> 'active' and '='. The method to set the value should be 'active=', not
> 'active ='

That is a typo, apologies.

> This may be due to an error in the description of the MBean.
> What you can do:
> * check what attributes are exposed by the jmx4r mbean
>   irb> standby_mbean.attributes

standby_mbean.attributes.each { |a | puts a.grep /^ac/ }
# => active

> * check what is exposed by the Real JMX MBean object:
>   irb>  JMX::MBean.pretty_print
> "xxx.jmx.monitors:name=hydra.planb.cps,type=JmsQueueStatsMBeanFactory"

very nice

> In you case, you should see a "Value" attribute which is both readable
> and writable.

writable is false and I am an idiot.

I then successfully invoked a JMX operation on the object returned
with MBean#find_by_name

Thanks

Aidy

On Aug 4, 3:46 pm, Jeff Mesnil <jmes...@gmail.com> wrote:
> aidy wrote:
> > Hi,
>
> > I am attempting to use the jmx4r library to set an MBean attribute.
> > `method_missing': undefined method `active ='
>
> > exception, when I attempt to set the attribute.
>
> This error is strange, there should not be a white space between
> 'active' and '='. The method to set the value should be 'active=', not
> 'active ='
>
> This may be due to an error in the description of the MBean.
> What you can do:
> * check what attributes are exposed by the jmx4r mbean
>   irb> standby_mbean.attributes
> * check what is exposed by the Real JMX MBean object:
>   irb>  JMX::MBean.pretty_print
> "xxx.jmx.monitors:name=hydra.planb.cps,type=JmsQueueStatsMBeanFactory"
>
> In you case, you should see a "Value" attribute which is both readable
> and writable.
>
> hope that helps,
> jeff
> --
> Posted viahttp://www.ruby-forum.com/.