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[equinox-dev] problems with registry change events


I am working on a program that performs some additional integrity checks between bundles collaborating through extension points and extensions. I want to trigger verification whenever new extensions or extension points are registered. I have done a little spike: I wrote a plugin that starts early (by adding it to config.ini), and added the following code to the start method in the Activator class (the Activator also implements IRegistryChangeListener):

private boolean initialized = false;
public void registryChanged(IRegistryChangeEvent e) {
System.out.println("registry changed");
public void start(final BundleContext context) throws Exception {
plugin = this;
BundleListener l = new BundleListener() {
public void bundleChanged(BundleEvent e) {
System.out.println("bundle changed: "+e.getBundle().getSymbolicName());
if (!initialized && Platform.getExtensionRegistry()!=null) {
System.out.println("registry loaded");
initialized = true;

The idea is to wait for the extension registry, and once it becomes available to start listening for registry change events. The output on the console is the following:

bundle changed: nz.ac.massey.treaty.spikes.events.main
registry loaded
bundle changed: org.eclipse.jface
bundle changed: org.eclipse.ui

... (more bundle changed: .. - )

It seems that registryChanged is never invoked. Even if I install a plugin later (once the eclipse instance is running) from a local update site, the method is never called (no print out, I have tried to debug as well). Why is this?

Any help is appreciated!