[jopr-dev] Plugin Dependencies

[mazz at redhat.com]

It sounds like what you are doing is correct. If you have a plugin "A" and it has some classes that you want available to plugin "B", then plugin "B"'s descriptor should have a <depends> tag on plugin "A":

   <plugin name="B" ...>
      <depends plugin="A" useClasses="true" />
      ...
   </plugin>

What this does is put A's plugin classloader as the parent to B's plugin classloader. You do not have to do anything else other than put that <depends> in your descriptor (no need to put the plugin jar in your plugin jar's lib directory).

FYI: The useClasses, if not defined, is inferred on the last <depends> tag listed in the descriptor. If you only have one <depends> tag, its useClasses is assumed true if its not specified.

BTW: recently, alot of work has gone into trunk that performs more classloading "stuff". See: http://jopr.org/confluence/display/RHQ/Plugin+Dependencies+and+Class+Loaders

----- Original Message -----
From: "Bruno Wassermann" <bruno.wassermann at googlemail.com>
To: "jopr-dev" <jopr-dev at lists.jboss.org>
Sent: Thursday, July 30, 2009 5:46:05 PM GMT -05:00 US/Canada Eastern
Subject: Re: [jopr-dev] Plugin Dependencies


Whoops, it should rather be <depends plugin="xyz" useClasses="true/>, right? Sorry about the premature question :( 

-- Bruno 


On Thu, Jul 30, 2009 at 10:41 PM, Bruno Wassermann < bruno.wassermann at googlemail.com > wrote: 


Hi, 

This may be a typical newbie question... 

I want the Axis plugin to be able to reuse some classes defined in the Tomcat plugin, namely TomcatConfig. To achieve this lofty goal I add the following to Axis.rhq-plugin.xml: <depends plugin="Tomcat"/>. 
However, at runtime the class loader for the Axis plugin doesn't seem to have loaded Tomcat's classes. Asking the agent to run a discovery scan, the Axis plugin reports a NoClassDefFoundError for org.jboss.on.tomcat.helper.TomcatConfig. 

What am I getting wrong here? Do I have to manually add the Tomcat plugin's jar file to my plugin? 

Many thanks, 

-- Bruno 


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