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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) 2014, 2018, 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 propertiesparser;

import propertiesparser.parser.MessageFile;
import propertiesparser.gen.ClassGenerator;

import java.io.File;
import java.io.PrintStream;
import java.util.TreeMap;
import java.util.Map;

/** Translates a .properties file into a .java file containing an enum-like Java class
 *  which defines static factory methods for all resource keys in a given resource file. 
 *
 *  Usage: java PropertiesParser -compile [path to .properties file] [output folder where .java file will be written]
 *
 * @author mcimadamore
 */

public class PropertiesParser {

    public Logger logger;

    public PropertiesParser(Logger logger) {
        this.logger = logger;
    }

    public static void main(String[] args) {
        boolean ok = run(args, System.out);
        if ( !ok ) {
            System.exit(1);
        }
    }

    public static boolean run(String[] args, PrintStream out) {
        PropertiesParser pp = new PropertiesParser(out::println);
        return pp.run(args);
    }

    public static interface Logger {
        void info(String msg);
    }

    public void info(String msg) {
        logger.info(msg);
    }

    public boolean run(String[] args) {
        Map optionsMap = parseOptions(args);
        if (optionsMap.isEmpty()) {
            usage();
            return false;
        }
        try {
            optionsMap.forEach(this::compilePropertyFile);
            return true;
        } catch (RuntimeException ex) {
            ex.printStackTrace();
            return false;
        }
    }

    private void compilePropertyFile(String propertyPath, String outPath) {
        try {
            File propertyFile = new File(propertyPath);
            String prefix = propertyFile.getName().split("\\.")[0];
            MessageFile messageFile = new MessageFile(propertyFile, prefix);
            new ClassGenerator().generateFactory(messageFile, new File(outPath));
        } catch (Throwable ex) {
            throw new RuntimeException(ex);
        }
    }

    private Map parseOptions(String args[]) {
        /* Use TreeMap to guarantee stable forEach iteration */
        Map optionsMap = new TreeMap<>();
        for ( int i = 0; i < args.length ; i++ ) {
            if ( "-compile".equals(args[i]) && i+2 < args.length ) {
                optionsMap.put(args[++i], args[++i]);
            } else {
                return new TreeMap<>();
            }
        }
        return optionsMap;
    }

    private void usage() {
        info("usage:");
        info("    java PropertiesParser {-compile path_to_properties_file path_to_java_output_dir}");
        info("");
        info("Example:");
        info("    java PropertiesParser -compile resources/test.properties resources");
    }
}