Re: [equinox-dev] JAR file references in Equinox Hooks?

[Thomas Watson <tjwatson@xxxxxxxxxx>]

When you say Equinox hook bundle I assume you mean a fragment of org.eclipse.osgi that provides an adaptor hook implementation.

These types of bundles are loaded very early by the launcher before the Framework is loaded. Because of this we have limited support for loading inner jars from these types of bundles. It can be done but the bundle that includes your framework hook implementation must be in a directory bundle (not jared). And it must contain a an eclipse.properties file at its root that includes a property osgi.frameworkClassPath which specifies the inner jars. (e.g. osgi.frameworkClassPath=asm.jar).

This is the legacy way that we load framework extension bundles with hook implementations and one that we have not documented well because it got dropped in favor of framework extension bundles for the OSGi specification. The code at org.eclipse.equinox.launcher.Main.readFrameworkExtensions(URL, ArrayList) is where the eclipse.properties is read from your equinox hook bundle (framework extension). I also suggest you open an enhancement bug against Equinox to allow for framework extensions with hooks specify the Bundle-ClassPath manifest header to point to inner jars. This would allow you to move off the legacy eclipse.properties file to specify your inner jar.

Tom



Craig Setera ---08/09/2008 01:39:32 PM---Quite some time ago, I added a classloader hook bundle for my EclipseME plugin to allow EclipseME t

From:	Craig Setera <craigjunk@xxxxxxxxxx>
To:	equinox-dev@xxxxxxxxxxx
Date:	08/09/2008 01:39 PM
Subject:	[equinox-dev] JAR file references in Equinox Hooks?

---

Quite some time ago, I added a classloader hook bundle for my EclipseME 
plugin to allow EclipseME to do a bit of rewriting of a JDT class and 
provide a hook that I needed to introduce preprocessed source code 
handling.  This code has been working for quite some time.  It includes 
use of the ASM library packaged as classes within the hook's JAR file.

As this functionality is being ported to the official Eclipse MTJ 
project, there is a concern from Eclipse legal concerning packaging the 
ASM classes in this way.  In order to pass legal approval, the ASM JAR 
file needs to be used as-is.  This leads to my question.  Is it possible 
for an Equinox hook bundle to reference a JAR file in the bundle 
classpath in some way?  I know at the time that I implemented this 
functionality a couple of years ago that I could not get this to work.  
My hope is that there is a way and I just wasn't doing things right. 

I'd appreciate any insights that the Equinox team can give me on behalf 
of the MTJ project.

Thanks,
Craig
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