public void differentInstances(){
Injector injector = Guice.createInjector(new MyModule(), new JpaPersistModule("appEngine"));
PersistService service = injector.getInstance(PersistService.class);
service.start();
ArticlesOAM oam1 = injector.getInstance(ArticlesOAM.class);
ArticlesOAM oam2 = injector.getInstance(ArticlesOAM.class);
assertNotSame(oam1, oam2);
service.stop();
}