code: void setInitializationData(Bundle contributingBundle, ServiceReference<?> urlConverterSR) {
  		if (this.contributingBundle != null || this.urlConverterSR != null) {
  			throw new IllegalStateException();
  		}
  		this.contributingBundle = contributingBundle;
  		this.urlConverterSR = urlConverterSR;
  	}
docs: /*
  Package-private initializer for unit testing