EclipseContextFactory.getServiceContext(BundleContext)

public class MyActivator implements BundleActivator {
  public void start(BundleContext ctx) {
    Foo f = new Foo();
    expose(Foo.class, f);
  }
  public void stop(BundleContext ctx) {...}
}

public class MyHandler {
  @Injected private Foo f;
  ...
}

@PostContextCreate
public void exposeSpringBeans(IEcliseContext context)  {
  // 2.1. Get (and maybe wait until loaded) ApplicationContext from my BundleContext
  BundleContext bundleContext = FrameworkUtil.getBundle(getClass()).getBundleContext();
  ApplicationContext ac = getApplicationContext(bundleContext);

  // 2.2. Get the eclipseContext that was created and populated during AC creation
  IEclipseContext eclipseSpringContext = ac.getBean("eclipseContext", IEclipseContext.class);

  // context.getParent() is the context for 'org.eclipse.e4.ui.workbench' bundle
  // this context has no parent
  // 2.3. Set the spring eclipse context as the parent of this one
  IEclipseContext eclipseUiPluginContext = context.getParent();
  eclipseUiPluginContext.setParent(eclipseSpringContext);
}