code: public String getServicePid()
      {
          String servicePid = context.getProperty(BundleConstants.SERVICE_PID);
          if (servicePid != null)
              return servicePid;
          servicePid = this.getServiceClassName();
          if (servicePid == null)
              servicePid = this.getClass().getName();
          return ClassFinderActivator.getPackageName(servicePid, false);
      }
docs: The service key in the config admin system.
  @return By default the package name, else override this.