Spring REST partial update with @PATCH method

Question

I\'m trying to implement a partial update of the Manager entity based in the following:

Entity

public class Manager {
    private int id;
    private Str         


        

Answer 1

With this, you can patch your changes

1. Autowire `ObjectMapper` in controller;

2. @PatchMapping("/manager/{id}")
    ResponseEntity saveManager(@RequestBody Map manager) {
        Manager toBePatchedManager = objectMapper.convertValue(manager, Manager.class);
        managerService.patch(toBePatchedManager);
    }

3. Create new method `patch` in `ManagerService`

4. Autowire `NullAwareBeanUtilsBean` in `ManagerService`

5. public void patch(Manager toBePatched) {
        Optional optionalManager = managerRepository.findOne(toBePatched.getId());
        if (optionalManager.isPresent()) {
            Manager fromDb = optionalManager.get();
            // bean utils will copy non null values from toBePatched to fromDb manager.
            beanUtils.copyProperties(fromDb, toBePatched);
            updateManager(fromDb);
        }
    }

You will have to extend BeanUtilsBean to implement copying of non null values behaviour.

public class NullAwareBeanUtilsBean extends BeanUtilsBean {

    @Override
    public void copyProperty(Object dest, String name, Object value)
            throws IllegalAccessException, InvocationTargetException {
        if (value == null)
            return;
        super.copyProperty(dest, name, value);
    }
}

and finally, mark NullAwareBeanUtilsBean as @Component

or

register NullAwareBeanUtilsBean as bean

@Bean
public NullAwareBeanUtilsBean nullAwareBeanUtilsBean() {
    return new NullAwareBeanUtilsBean();
}