Uninstall a eclipse Plugin Programmatically before startup of eclipse -


i have rcp based product. , want uninstall eclipse plugins on start of rcp on checking license file , depending on license type.

i have achieved through subclass of workbenchadvisor , overriding prestartup() method.

below workbenchadvisor class. 

public class applicationworkbenchadvisor extends workbenchadvisor {    boolean islicenseavailable = true;    /**    * {@inheritdoc}    */   @override   public void prestartup() {     licensemanager.getinstance();   }    private static final string perspective_id = "com.example.perspective"; //$non-nls-1$    @override   public workbenchwindowadvisor createworkbenchwindowadvisor(final iworkbenchwindowconfigurer configurer) {     return new applicationworkbenchwindowadvisor(configurer);   }    @override   public string getinitialwindowperspectiveid() {     return perspective_id;   }

}

then below snippet uninstalls plugins in licensemanager class depending on licensetype.

  bundle plugin = platform.getbundle("com.example.test"); bundle bundle = plugin.getbundlecontext().getbundle(0); frameworkwiring adapt = bundle.adapt(frameworkwiring.class); try {   if (plugin != null) {     extensionregistry registry = (extensionregistry) platform.getextensionregistry();     field privatestringfield = extensionregistry.class.getdeclaredfield("mastertoken"); //$non-nls-1$     privatestringfield.setaccessible(true);     object mastertoken = privatestringfield.get(registry);      icontributor contributor = contributorfactoryosgi.createcontributor(plugin);     iextension[] points = registry.getextensions(contributor);     (iextension point : points) {       point.getextensionpointuniqueidentifier();       platform.getextensionregistry().removeextension(point, mastertoken);     }     adapt.refreshbundles(adapt.getremovalpendingbundles());     plugin.uninstall();     thread.sleep(5000);   } } catch (bundleexception | securityexception | illegalargumentexception e) {   e.printstacktrace(); } catch (nosuchfieldexception | illegalaccessexception w) {   w.printstacktrace(); } catch (interruptedexception e) {   e.printstacktrace(); } super.prestartup();

now plugins getting uninstalled , menu contributions disappearing not of them. if have menu "test" , under 2 commands "c1 , c2". c1 , c2 disappears not menu "test".

and i'm getting below exception each time click on menu. , pop menus going toss. none of popup menus under navigator coming. there same exception.

org.eclipse.e4.core.di.injectionexception: org.eclipse.core.runtime.invalidregistryobjectexception: invalid registry object @ org.eclipse.e4.core.internal.di.methodrequestor.execute(methodrequestor.java:68) @ org.eclipse.e4.core.internal.di.injectorimpl.invokeusingclass(injectorimpl.java:252) @ org.eclipse.e4.core.internal.di.injectorimpl.invoke(injectorimpl.java:234) @ org.eclipse.e4.core.contexts.contextinjectionfactory.invoke(contextinjectionfactory.java:132) @ org.eclipse.e4.core.commands.internal.handlerservicehandler.setenabled(handlerservicehandler.java:80) @ org.eclipse.core.commands.command.setenabled(command.java:875)


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