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The byteman jar merges the byteman-agent jar contents with those of the byteman-jigsaw and byteman-layer jars as a mutli-release jar. The contents of the latter two jars are installed under META-INF/versions/9 ensuring that they are only linked when Byteman is deployed on a JDK9+ JVM

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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2008-2018 Red Hat and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.jboss.byteman.modules;

/**
 * this is a classloader used to define classes from bytecode
 */
public class ClassbyteClassLoader extends ClassLoader
{
    public ClassbyteClassLoader(ClassLoader cl)
    {
        super(cl);
    }

    public Class addClass(String name, byte[] bytes)
            throws ClassFormatError
    {
        Class cl = defineClass(name, bytes, 0, bytes.length);
        resolveClass(cl);

        return cl;
    }
}