Cannot update an object more than once

Question

I want to write a function that will update products freely.
But in the second update I get an error:

org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect) : [guru.springframework.domain.Product#4]

the code in the controller :

    @ApiOperation(value = "Update a product")
    @RequestMapping(value = "/update/", method = RequestMethod.PUT, produces = "application/json")
    public ResponseEntity<EntityModel<Product>> updateProduct(@RequestBody Product product){
       return productService.updateProduct(product);
    }

the code in the ServiceImpl :

@Override
    public ResponseEntity<EntityModel<Product>> updateProduct(Product product) {
        boolean exist=productRepository.existsById(product.getProductId());
        if(exist){
            productRepository.save(product);
            return ResponseEntity.ok().body(productEntityFactory.toModel(product));
        }else {
            throw new EntityNotFoundException("There is no product with the given ID, so it can't be updated");
        }
    }

if the sent json does not undergo any change, then you can send it as many as you want, but if there is a change, it will only work for the first time.

Answer 1

You have to flush your change. Because otherwise you leave the change from the first request 'open'. Just use productRepository.saveAndFlush(product); Instead of productRepository.save(product);

This should work