Question

我在JPA / Hibernate中遇到奇怪的错误......我正在

PersistentObjectException: detached entity passed to persist

尝试删除具有由ProviderId和ServicePointNumber组成的组合键的ServicePoint实体时。（Provider是另一个实体，ServicePoint表示依赖于Provider实体的弱实体）。

代码如下所示：

@DELETE
        @Path("/{servicePointNumber : \\d+}")
        @Produces({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML})
        public Response removeServicePoint( @PathParam("userId") Long userId,
                                            @PathParam("servicePointNumber") Integer servicePointNumber,
                                            @BeanParam GenericBeanParam params) throws ForbiddenException, NotFoundException {

            if(params.getAuthToken() == null) throw new ForbiddenException("Unauthorized access to web service.");
            logger.log(Level.INFO, "removing given Service Point by executing ProviderResource.ServicePointResource.removeServicePoint(userId, servicePointNumber) method of REST API");

            // find ServicePoint entity that should be deleted
            ServicePoint toDeleteServicePoint = servicePointFacade.find( new ServicePointId(userId, servicePointNumber) );
            // throw exception if entity hasn't been found
            if(toDeleteServicePoint == null)
                throw new NotFoundException("Could not find service point to delete for given id: " + userId + ".");

            // remove entity from database
            servicePointFacade.remove(toDeleteServicePoint);

            return Response.status(Status.NO_CONTENT).build();
        }

实体外观删除方法的实现：

public void remove(@NotNull T entity) {
        getEntityManager().remove(getEntityManager().merge(entity));
    }

Answer 1

在某个时候你使用的是Evict？或某些session.clear？

PersistentObjectException：在使用复合键

1 个答案: