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Java library to map flat record - ResultSet, csv - to java object with minimum configuration and low footprint.
There is a newer version: 9.0.2
package org.simpleflatmapper.reflect.meta;

import org.simpleflatmapper.reflect.ScoredSetter;
import org.simpleflatmapper.reflect.instantiator.ExecutableInstantiatorDefinition;
import org.simpleflatmapper.reflect.Getter;
import org.simpleflatmapper.reflect.InstantiatorDefinition;
import org.simpleflatmapper.reflect.Parameter;
import org.simpleflatmapper.reflect.ReflectionService;
import org.simpleflatmapper.reflect.ScoredGetter;
import org.simpleflatmapper.util.Consumer;
import org.simpleflatmapper.util.ErrorHelper;
import org.simpleflatmapper.util.Predicate;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.*;

public class OptionalClassMeta implements ClassMeta> {

    private final ReflectionService reflectionService;
	private final Type type;
	private final InstantiatorDefinition instantiatorDefinition;
    private final ConstructorPropertyMeta, ?> propertyMeta;
	private final ClassMeta innerMeta;

	public OptionalClassMeta(ReflectionService reflectionService, Type type, InstantiatorDefinition instantiatorDefinition, ConstructorPropertyMeta, ?> propertyMeta, ClassMeta innerMeta) {
		this.reflectionService = reflectionService;
		this.type = type;
		this.instantiatorDefinition = instantiatorDefinition;
		this.propertyMeta = propertyMeta;
		this.innerMeta = innerMeta;
	}

	public OptionalClassMeta(Type type, ReflectionService reflectionService) {
		this.type = type;
		this.reflectionService = reflectionService;

		try {
            this.instantiatorDefinition = getInstantiatorDefinition(type);
			this.propertyMeta = new ConstructorPropertyMeta, Object>("value",
                    type, reflectionService,
					instantiatorDefinition.getParameters()[0],
					new ScoredGetter, Object>(Integer.MAX_VALUE, new OptionalGetter()),
					ScoredSetter., Object>nullSetter(),
					instantiatorDefinition, null);
			this.innerMeta = reflectionService.getClassMeta(instantiatorDefinition.getParameters()[0].getGenericType());
		} catch(Exception e) {
            ErrorHelper.rethrow(e);
            throw new IllegalStateException();
		}
	}

	@Override
	public ClassMeta> withReflectionService(ReflectionService reflectionService) {
		return new OptionalClassMeta(reflectionService, type, instantiatorDefinition, propertyMeta.withReflectionService(reflectionService), reflectionService.getClassMeta(innerMeta.getType()));
	}

    private InstantiatorDefinition getInstantiatorDefinition(Type type) throws NoSuchMethodException {
        ParameterizedType pt = (ParameterizedType) type;
        InstantiatorDefinition id = new ExecutableInstantiatorDefinition(Optional.class.getMethod("ofNullable", Object.class),
                new Parameter(0, "value", Object.class, pt.getActualTypeArguments()[0]));
        return id;
    }


    @Override
	public ReflectionService getReflectionService() {
		return reflectionService;
	}

	@Override
	public PropertyFinder> newPropertyFinder() {
		return new OptionalPropertyFinder(this, reflectionService.selfScoreFullName());
	}

	public Type getType() {
		return type;
	}

	public ClassMeta getInnerMeta() {
		return innerMeta;
	}

    public PropertyMeta, ?> getProperty() {
        return propertyMeta;
    }

	@Override
	public List getInstantiatorDefinitions() {
		return Arrays.asList(instantiatorDefinition);
	}

	@Override
	public void forEachProperties(Consumer, ?>> consumer) {
		consumer.accept(propertyMeta);
	}

	@Override
	public int getNumberOfProperties() {
		return 1;
	}

	@Override
	public boolean needTransformer() {
		return false;
	}




	private static class OptionalGetter implements Getter, Object> {
		@Override
        public Object get(Optional target) throws Exception {
            return target.orElse(null);
        }
	}
}