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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) 1999, 2020, 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.javac;

import java.io.PrintWriter;

/**
 * A legacy programmatic interface for the Java Programming Language
 * compiler, javac.
 * See the {@code jdk.compiler}
 * module for details on replacement APIs.
 */
public class Main {
    public Main(){}

    /** Main entry point for the launcher.
     *  Note: This method calls System.exit.
     *  @param args command line arguments
     *  @throws Exception only if an uncaught internal exception occurs;
     *      just retained for historical compatibility
     */
    public static void main(String[] args) throws Exception {
        System.exit(compile(args));
    }

    /** Programmatic interface to the Java Programming Language
     * compiler, javac.
     *
     * @param args The command line arguments that would normally be
     * passed to the javac program as described in the man page.
     * @return an integer equivalent to the exit value from invoking
     * javac, see the man page for details.
     */
    public static int compile(String[] args) {
        com.sun.tools.javac.main.Main compiler =
            new com.sun.tools.javac.main.Main("javac");
        return compiler.compile(args).exitCode;
    }



    /** Programmatic interface to the Java Programming Language
     * compiler, javac.
     *
     * @param args The command line arguments that would normally be
     * passed to the javac program as described in the man page.
     * @param out PrintWriter to which the compiler's diagnostic
     * output is directed.
     * @return an integer equivalent to the exit value from invoking
     * javac, see the man page for details.
     */
    public static int compile(String[] args, PrintWriter out) {
        com.sun.tools.javac.main.Main compiler =
            new com.sun.tools.javac.main.Main("javac", out);
        return compiler.compile(args).exitCode;
    }
}