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From "John H. Embretsen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DERBY-3424) Add an MBean that an application can register to change the state of Derby's JMX management
Date Mon, 18 Feb 2008 17:44:34 GMT

    [ https://issues.apache.org/jira/browse/DERBY-3424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12569960#action_12569960
] 

John H. Embretsen commented on DERBY-3424:
------------------------------------------

Thanks for the details!

>>     - Then the MBeans "registered" with Derby's management service are also automatically
registered with the MBean server. This currently only includes the VersionMBean.
> 
> No for the last sentence,currently the JDBC mbean will also register as well as the VersionMBean,
but this is not hardcoded into Derby's management service, it's just a factor of which mbeans
have been registered with Derby's management service.

(see also A2))

Ah, I think I understand this now. Even if Derby is started with JMX management disabled,
the MBeans (except the ManagementMBean) are automatically registered in Derby's Management
service at boot time (or whenever they are scheduled to be created) and therefore available
(and registerable with the MBeanServer) once management is enabled dynamically.


> Add an MBean that an application can register to change the state of Derby's JMX management
> -------------------------------------------------------------------------------------------
>
>                 Key: DERBY-3424
>                 URL: https://issues.apache.org/jira/browse/DERBY-3424
>             Project: Derby
>          Issue Type: New Feature
>            Reporter: Daniel John Debrunner
>            Assignee: Daniel John Debrunner
>            Priority: Minor
>
> JMX in Derby was originally proposed as a mechanism to configure Derby replacing or enhancing
the system properties which tend to be static in nature. Thus it is somewhat ironic that jmx
is enabled with a static system property derby.system.jmx.
> I propose to add a public mbean that allows the state Derby's JMX management to be changed.
This bean is not automatically registered by Derby if derby.system.jmx is false, but instead
can be registered by an application. I believe this could occur at any time so that JMX could
be enabled on a running application, possibly by a remote client.
> This standard Mbean (o.a.d.mbeans.Management & ManagementMBean) would have these
operations & attribute:
>     public boolean isManagementActive();
>     public void startManagement(); 
>     public void stopManagement();
> If Derby is not booted within the jvm then the operations would be no-ops.
> If derby.system.jmx is true then Derby will itself register an mbean that implements
ManagementMBean to allow dynamic control of the visibility of Derby's mbeans.

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