Java Language Tutorial => How to load a ClassNode as a Class

Example

/**
 * Load a class by from a ClassNode
 * 
 * @param cn
 *            ClassNode to load
 * @return
 */
public static Class<?> load(ClassNode cn) {
    ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
    return new ClassDefiner(ClassLoader.getSystemClassLoader()).get(cn.name.replace("/", "."), cw.toByteArray());
}

/**
 * Classloader that loads a class from bytes.
 */
static class ClassDefiner extends ClassLoader {
    public ClassDefiner(ClassLoader parent) {
        super(parent);
    }

    public Class<?> get(String name, byte[] bytes) {
        Class<?> c = defineClass(name, bytes, 0, bytes.length);
        resolveClass(c);
        return c;
    }
}

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