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Jodd Core tools and huge number of utilities.

There is a newer version: 5.3.0

// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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package jodd.util;

import java.lang.reflect.Method;

public class DefineClass {

	/**
	 * Defines a class from byte array into the specified class loader.
	 * Warning: this is a hack!
	 * @param className optional class name, may be null
	 * @param classData bytecode data
	 * @param classLoader classloader that will load class
	 */
	public static Class of(final String className, final byte[] classData, ClassLoader classLoader) {
		if (classLoader == null) {
			classLoader = ClassLoaderUtil.getDefaultClassLoader();
		}
		try {
			final Method defineClassMethod = ClassLoader.class.getDeclaredMethod("defineClass", String.class, byte[].class, int.class, int.class);
			defineClassMethod.setAccessible(true);
			return (Class) defineClassMethod.invoke(classLoader, className, classData, 0, classData.length);
		} catch (final Throwable th) {
			throw new RuntimeException("Define class failed: " + className, th);
		}
	}

}