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"nb-javac" is a patched version of OpenJDK "javac", i.e., the Java compiler. This has long been part of NetBeans, providing a highly tuned Java compiler specifically for the Java editor i.e., parsing and lexing for features such as syntax coloring, code completion.

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/*
 * Copyright (c) 2007, 2016, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.tools.javap;

import java.io.PrintWriter;
import java.util.spi.ToolProvider;

/**
 *  Main entry point.
 *
 *  This is NOT part of any supported API.
 *  If you write code that depends on this, you do so at your own risk.
 *  This code and its internal interfaces are subject to change or
 *  deletion without notice.
 */
public class Main {
    /**
     * Main entry point for the launcher.
     * Note: This method calls System.exit.
     * @param args command line arguments
     */
    public static void main(String[] args) {
        JavapTask t = new JavapTask();
        int rc = t.run(args);
        System.exit(rc);
    }

    /**
     * Entry point that does not call System.exit.
     * @param args command line arguments
     * @param out output stream
     * @return an exit code. 0 means success, non-zero means an error occurred.
     */
    public static int run(String[] args, PrintWriter out) {
        JavapTask t = new JavapTask();
        t.setLog(out);
        return t.run(args);
    }

    public static class JavapToolProvider implements ToolProvider {
        public String name() {
            return "javap";
        }

        public int run(PrintWriter out, PrintWriter err, String... args) {
            return Main.run(args, out);
        }
    }
}