ServiceBroker sb = getBindingSite().getServiceBroker();
ServiceBroker sb = getServiceBroker();
  public void unload() {    ServiceBroker sb = getBindingSite().getServiceBroker();    if (ldmService != null) {      sb.releaseService(          this, LDMService.class, ldmService);      ldmService = null;    }    if (domainService != null) {      sb.releaseService(          this, DomainService.class, domainService);      domainService = null;    }    if (agentIdService != null) {      sb.releaseService(          this, AgentIdentificationService.class, agentIdService);      agentIdService = null;    }    super.unload();  }