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From neykov <>
Subject [GitHub] incubator-brooklyn pull request: OSGi class loading fixes
Date Mon, 28 Jul 2014 12:14:39 GMT
Github user neykov commented on a diff in the pull request:
    --- Diff: core/src/main/java/brooklyn/management/ha/ ---
    @@ -108,11 +108,22 @@ public void registerBundle(String bundleUrl) {
                     if (bundleNameVersion==null) {
                         bundleNameVersion = bundleUrlOrNameVersionString;
                     Maybe<Bundle> bundle = Osgis.getBundle(framework, bundleNameVersion);
                     if (bundle.isPresent()) {
    -                    @SuppressWarnings("unchecked")
    -                    Class<T> clazz = (Class<T>) bundle.get().loadClass(type);
    +                    Bundle b = bundle.get();
    +                    Class<T> clazz;
    +                    //Extension bundles don't support loadClass.
    +                    //Instead load from the app classpath.
    +                    if (Osgis.isExtensionBundle(b)) {
    +                        @SuppressWarnings("unchecked")
    +                        Class<T> c = (Class<T>)Class.forName(type);
    --- End diff --
    Extension bundles are almost identical to the previous approach we used. Their goal is
to direct Felix to use the app's classloader. The only difference is that now the container
knows the name:version of the code that is on the classpath and will deny requests to install
external bundles with matching name:version.
    Felix still doesn't know for the existence of our bundle-A, we just tell it that the Export-Package
list in the extension bundle should be looked for in the app's classpath. We don't ever install
bundle-A in Felix. There is a hardcoded check that throws on an attempt to bundle.loadClass
from extension bundle.
    With that in mind, yes the code deliberately ignores extension bundles and goes directly
for the app's classloader.

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