Re: [platform-ant-dev] Using other eclipse plugin resources from contrib

[Chris McGee <cbmcgee@xxxxxxxxxx>]

Thanks for the info.

I managed to get the task to work fairly well as a member of my plugin as you suggested. For the library, I just set the xml attribute to "" and it seems to pick up the class from the jar for the plugin.

I must be running into some problems with eclipse 3.0 M6 and its classloader. There are some classes that I can access beyond my plugin, there are others that I can access beyond my plugin if I run the ant script twice (very strange) and there are still others that I cannot execute without exceptions being generated in the OSGi plugin loading code.

Thanks for the clarifications,

Chris

Thursday, February 19, 2004 4:11 PM
To: platform-ant-dev@xxxxxxxxxxx
cc:
From: Darin Swanson <Darin_Swanson@xxxxxxxxxx>
Subject: Re: [platform-ant-dev] Using other eclipse plugin resources from contributed ant task.

I must have mislead you. 
You get all the classloader "magic" for free by using the extension point 
and setting the correct requirements for your plugin in the plugin.xml. 
You should be able to reference any class from 
your Ant task if that class is within the requirements chain for your 
plugin. 
The classloader for that class 
will be the plugin classloader. 
Using 
that classloader you can access the resource you need. 

To get around using the bin directory as the library 
attribute value, we make use of the external tool builder support to 
automatically generate our JARs whenever we modify the source for the component 
classes of the JARs. 

I hope I have 
made things clearer... 
Darins

Chris McGee <cbmcgee@xxxxxxxxxx> Sent by: platform-ant-dev-admin@xxxxxxxxxxx 02/19/04 11:50 AM Please respond to platform-ant-dev

To:        platform-ant-dev@xxxxxxxxxxx         cc:                 Subject:        Re: [platform-ant-dev] Using other eclipse plugin resources from contributed ant task.

Hi 
Darins,

Thanks for the response.

I've defined my task using the 
extension point. What should I specify as the library tag that would normally be 
pointing to a JAR with my task? Right now, I've tried just specifying the "bin" 
directory and it seems to work alright until we decide to package this stuff. 
The ClassLoaders seem to be very fragile and will load certain classes just fine 
but throw NPE's on others.

How does one get access to the AntClassLoader? 
I'm assuming that I could get the Class for the task I've defined, and ask the 
class for its classloader, which would be the one used in ant. After that, how 
can you set the classloader's parent?

Chris



Thursday, February 19, 2004 2:25 PM
To: 
platform-ant-dev@xxxxxxxxxxx
cc: 
From: Darin Swanson 
<Darin_Swanson@xxxxxxxxxx>
Subject: Re: [platform-ant-dev] Using other 
eclipse plugin resources from contributed ant task.


If the dependancies are set up correctly for the 
plugin you are providing the task from. 
Using the Eclipse extension 
point for defining tasks, the plugin classloader for the plugin contributing the 
task is added as a parent classloader of the AntClassLoader that is used during 
the build. 

Then you could get a class from the other plugin, get 
its classloader and ask that classloader to load the resource. 
I have not 
tried it but it should work...famous last words :-) 

HTH 
Darins

Chris McGee <cbmcgee@xxxxxxxxxx> Sent by: platform-ant-dev-admin@xxxxxxxxxxx 02/19/04 10:52 AM Please respond to platform-ant-dev

To:        platform-ant-dev@xxxxxxxxxxx        cc:                Subject:        [platform-ant-dev] Using other eclipse plugin resources from contributed ant task.

Hi 
All,

Sorry if this question has an obvious answer. I'm just starting to 
learn
about Ant and its integration into Eclipse 3.

Is it possible to 
define an Ant task in one of my plugins so that it may
access the other 
plugins that the plugin has dependencies? I'm able to get
an Ant task to work 
by creating a separate Jar that is not loaded as part
of my plugin but I 
would like ant task to have access to all of the
resources available from the 
other plugins.

Thanks,

Chris McGee
IBM
Ottawa, 
Canada

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