BeanUtils.java

import org.springframework.beans.FatalBeanException;
import org.springframework.util.Assert;

import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

public final class BeanUtils
        extends org.springframework.beans.BeanUtils {

    private BeanUtils() {
    }

    public static void copyNonNullProperties(
            Object source, Object target
    ) {
        Assert.notNull(source, "Source must not be null");
        Assert.notNull(target, "Target must not be null");
        Class<?> actualEditable = target.getClass();
        PropertyDescriptor[] targetPds = getPropertyDescriptors(actualEditable);
        for (PropertyDescriptor targetPd : targetPds) {
            if (targetPd.getWriteMethod() != null) {
                PropertyDescriptor sourcePd = getPropertyDescriptor(source.getClass(), targetPd.getName());
                if (
                        sourcePd != null
                                && sourcePd.getReadMethod() != null
                ) {
                    try {
                        Method readMethod = sourcePd.getReadMethod();
                        if (
                                !Modifier.isPublic(
                                        readMethod.getDeclaringClass()
                                                .getModifiers())
                        ) {
                            readMethod.setAccessible(true);
                        }
                        Object value = readMethod.invoke(source);
                        // Ignore properties with null values.
                        if (value != null) {
                            Method writeMethod = targetPd.getWriteMethod();
                            if (
                                    !Modifier.isPublic(
                                            writeMethod.getDeclaringClass()
                                                    .getModifiers())
                            ) {
                                writeMethod.setAccessible(true);
                            }
                            writeMethod.invoke(target, value);
                        }
                    } catch (Throwable ex) {
                        throw new FatalBeanException(
                                "Could not copy properties from source to target", ex
                        );
                    }
                }
            }
        }
    }

}

MovieController.java

import com.example.wildmovies.entity.Movie;
import com.example.wildmovies.repository.MovieRepository;
import com.example.wildmovies.utils.BeanUtils;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.server.ResponseStatusException;

import java.util.List;
import java.util.UUID;

@RestController
@RequestMapping("/api/movies")
public class MovieController {

    private final MovieRepository movieRepository;

    public MovieController(MovieRepository movieRepositoryInjected) {
        this.movieRepository = movieRepositoryInjected;
    }

    @PutMapping("/{id}")
    public Movie update(@PathVariable UUID id, @RequestBody Movie movieUpdate) {
        Movie movie = this.movieRepository
                .findById(id)
                .orElseThrow(() -> new ResponseStatusException(HttpStatus.NOT_FOUND));

        BeanUtils.copyNonNullProperties(movieUpdate, movie);

        return this.movieRepository.save(movie);
    }
}