Generate Mock-objects from a hashmap

ProxyGenerator.java

import org.apache.commons.lang.NotImplementedException;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.WordUtils;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.HashMap;

public class ProxyGenerator {

    private HashMap<String, Object> properties;

    private ProxyGenerator(HashMap<String, Object> properties) {
        this.properties = new HashMap<String, Object>(properties);
    }

    public static <T> T createProxyObject(HashMap<String, Object> properties, Class<T> clazz) {
        ProxyGenerator proxyGenerator = new ProxyGenerator(properties);
        ResultSetInvocationHandler handler = proxyGenerator.new ResultSetInvocationHandler();

        Class<?>[] classes = {clazz};
        return (T) Proxy.newProxyInstance(clazz.getClassLoader(), classes, handler);
    }

    private class ResultSetInvocationHandler implements InvocationHandler {
        public Object invoke(Object o, Method method, Object[] objects) throws Throwable {
            if (StringUtils.startsWith(method.getName(), "get")) {
                return properties.get(WordUtils.uncapitalize(method.getName().substring(3)));
            }
            throw new NotImplementedException();
        }
    }
}