update.java

@PutMapping(value="/{id}")
	public Product updateProductWithId(@PathVariable Long id, Product product) {
		Product currentProduct = productDAO.findOne(id);
		currentProduct.setCode(product.getCode());
		currentProduct.setDescription(product.getDescription());
		currentProduct.setUnitPrice(product.getUnitPrice());
		return  productDAO.save(product);
	}