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Java Object Patcher is simple, dependency-free and fast library which makes patching/merging objects simple.

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package com.buger.patcher.impl;

import com.buger.patcher.ObjectPatcher;
import com.buger.patcher.Utils;
import com.buger.patcher.exception.PatchException;
import com.buger.patcher.resolver.FieldValueResolver;
import com.buger.patcher.strategy.FieldStrategyBasedFieldValueResolverFactory;

import java.lang.reflect.Field;
import java.util.Set;

/**
 * @author Created by Buheria Oleksii {@literal [email protected]}
 * @version 1.0
 * @since 27-09-2020
 */
public class StrategyBasedObjectPatcher implements ObjectPatcher {

    private final FieldStrategyBasedFieldValueResolverFactory factory;

    public StrategyBasedObjectPatcher() {
        this.factory = new FieldStrategyBasedFieldValueResolverFactory();
    }

    public  T patch(S source, T target) throws PatchException {
        try {
            Set commonFields = Utils.getCommonFields(source.getClass(), target.getClass());
            for (Field field : commonFields) {
                FieldValueResolver fieldValueResolver = factory.createFieldPatcher(field);
                if (fieldValueResolver != null) {
                    boolean wasAccessible = field.isAccessible();
                    if (!wasAccessible) {
                        field.setAccessible(true);
                    }
                    Object sourceFieldValue = fieldValueResolver.resolveFieldValue(source, target);
                    field.set(target, sourceFieldValue);
                    if (!wasAccessible) {
                        field.setAccessible(false);
                    }
                }
            }
            return target;
        } catch (Exception e) {
            throw new PatchException("Cannot patch object or partially patched object", e);
        }
    }

}