code: public JobAgentInner createOrUpdate(String resourceGroupName, String serverName, String jobAgentName, JobAgentInner parameters) {
          return createOrUpdateWithServiceResponseAsync(resourceGroupName, serverName, jobAgentName, parameters).toBlocking().last().body();
      }
docs: Creates or updates a job agent.
  
  @param resourceGroupName The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
  @param serverName The name of the server.
  @param jobAgentName The name of the job agent to be created or updated.
  @param parameters The requested job agent resource state.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the JobAgentInner object if successful.