如何使用服务检查camunda中是否存在过程定义键？

import org.camunda.bpm.engine.ProcessEngine;
import org.camunda.bpm.engine.ProcessEngineConfiguration;
import org.camunda.bpm.engine.RepositoryService;
import org.camunda.bpm.engine.repository.ProcessDefinitionQuery;

public class CamundaProcessDefinitionChecker {
    public static void main(String[] args) {
        // 获取流程引擎服务
        ProcessEngine processEngine = ProcessEngineConfiguration
                .createStandaloneProcessEngineConfiguration()
                .buildProcessEngine();

        // 获取RepositoryService
        RepositoryService repositoryService = processEngine.getRepositoryService();

        // 创建过程定义查询对象
        ProcessDefinitionQuery query = repositoryService.createProcessDefinitionQuery();

        // 设置过程定义键
        String processDefinitionKey = "your-process-definition-key";
        query.processDefinitionKey(processDefinitionKey);

        // 获取匹配的过程定义数量
        long count = query.count();

        if (count > 0) {
            System.out.println("过程定义键存在");
        } else {
            System.out.println("过程定义键不存在");
        }
    }
}