Question

我正在为Camunda流程创建委托表达式，工作流程完美运行，但是当执行委托时，我的服务会创建对象，并且不会将其写入数据库。这是代码：

@Component
public class CreateNewROAction implements JavaDelegate {

    private final ROactionService rOactionService;
    private final RiskService riskService;
    private Logger logger = LoggerFactory.getLogger(CreateNewROAction.class);
    public CreateNewROAction(ROactionService rOactionService, RiskService riskService) {
    this.rOactionService = rOactionService;
    this.riskService = riskService;
}

    @Override
    public void execute(DelegateExecution delegateExecution) throws Exception {

        String processInstanceId = delegateExecution.getProcessInstanceId();
        String riskId = delegateExecution.getVariable("riskId").toString();
        Risk risk = riskService.findById(Long.parseLong(riskId));
        ROaction rOaction = new ROaction();
        rOaction.setProcessInstanceId(processInstanceId);
        rOaction = rOactionService.save(rOaction);
        logger.info("roAction object: " + rOaction.toString());
        risk.setAction(rOaction);
        risk = riskService.update(risk, risk.getId());
        logger.info("risk object: " + risk.toString());
        delegateExecution.setVariable("id", rOaction.getId());

    }
}

记录器表明我期望的结果：

roAction object: ROaction(id=4, description=null, status=null, responsible=null, deadline=null, AchievementDate=null, effectivenessEvaluationDate=null, effectivenessEvaluation=null, processInstanceId=819, createdAt=Wed Jul 03 15:08:19 CET 2019, updatedAt=Wed Jul 03 15:08:19 CET 2019)
risk object: Risk(id=4, description=null, probability=0, impact=0, cause=null, consequence=null, createdAt=2019-07-03 15:07:04.975, updatedAt=2019-07-03 15:07:04.975, processes=[], action=ROaction(id=4, description=null, status=null, responsible=null, deadline=null, AchievementDate=null, effectivenessEvaluationDate=null, effectivenessEvaluation=null, processInstanceId=819, createdAt=Wed Jul 03 15:08:19 CET 2019, updatedAt=Wed Jul 03 15:08:19 CET 2019), processInstanceId=801)

但数据库为空。
注意：
1.我必须将实体的ID更改为@GeneratedValue（strategy = GenerationType.SEQUENCE），因为在此之前，该服务从save（）函数返回空ID
2.控制器提供的服务正常运行

Answer 1

解决方案是不直接调用服务方法，而是通过@Transactional注释的私有方法来调用它们。原因是Hibernate在第一个调用中打开与数据库的连接，然后关闭它。该组件与数据库只有一个连接，因此在第一次调用后无法访问它。 @Transactional为该方法打开与数据库的新连接。

从组件调用服务时，为什么我的服务没有写在数据库中？

1 个答案: