无法使用Spring MVC在服务层包装DAO异常

Question

我正在尝试使用Spring MVC处理自定义异常处理。服务层DAO层异常处理程序和服务层对异常进行包装，并由Spring MVC的控制器异常处理程序对异常进行处理。以下是我的代码：

@Override
public void saveNewMachineDetails(Machine machine, Configurations configurations) throws DataNotPersist{
logger.info("call service saveNewMachineDetails method");

try{
    machineRepository.saveAndFlush(machine);
}catch(Exception ex){
//  logger.error(ex.getMessage());
    DataNotPersist dataNotPersist =  new DataNotPersist(messageSource.getMessage("code.object.notpersist", null, null), 
            messageSource.getMessage("msg.object.notpersist", new Object[]{"Machine"}, null), ex);
    throw dataNotPersist;
}}

在上面的代码中，DAO层的异常处理在服务层，并将该异常包装在自定义异常中，然后抛出该异常。

@ControllerAdvice
public class GlobalExceptionHandler {

private Logger logger =    LoggerFactory.getLogger(GlobalExceptionHandler.class);

@ExceptionHandler(value = DataNotPersist.class)
public ModelAndView defaultExceptionHandler(HttpServletRequest request, DataNotPersist ex)throws Exception {
logger.info("In GlobalExceptionHandler");

logger.debug("********* : "+ex.getMessage());

ModelAndView modelAndView = new ModelAndView();
modelAndView.addObject("exception", ex);
modelAndView.addObject("url", request.getRequestURL());
modelAndView.setViewName("common/error");
return modelAndView;
}}

Answer 1

在服务层中，当我抛出异常时，spring回滚事务，并在视图中将我的exception包装到transactionexception中。现在，我使用exception类处理事务回滚，如下所示：

@Override
@Transactional(value="transaction_manager", rollbackFor={DataNotPersist.class})
public void saveNewMachineDetails(Machine machine, Configurations configurations) throws DataNotPersist{
    logger.info("call service saveNewMachineDetails method");

    try{
        machineRepository.saveAndFlush(machine);
    }catch(DataAccessException ex){
        logger.error(ex.getMessage());
        DataNotPersist dataNotPersist =  new DataNotPersist(messageSource.getMessage("code.object.notpersist", null, null), 
                messageSource.getMessage("msg.object.notpersist", new Object[]{"Machine"}, null), ex);
        throw dataNotPersist;
    }}