code: private void resetAgents() {
      this.configurationAgent = null;
      this.keyAgent = null;
      this.userAgent = null;
      this.vnfPackageAgent = null;
      this.projectAgent = null;
      this.eventAgent = null;
      this.vnffgAgent = null;
      this.virtualNetworkFunctionDescriptorAgent = null;
      this.virtualLinkAgent = null;
      this.vimInstanceAgent = null;
      this.networkServiceDescriptorAgent = null;
      this.networkServiceRecordAgent = null;
      this.serviceAgent = null;
    }
docs: Set all the agent objects to null.