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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) 2016, 2022, 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.main;

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

import com.sun.tools.javac.util.JavacMessages;

/**
 * An implementation of the {@link java.util.spi.ToolProvider ToolProvider} SPI,
 * providing access to JDK Java compiler, javac.
 *
 * @since 9
 */
// This is currently a stand-alone top-level class so that it can easily be excluded
// from interims builds of javac, used while building JDK.
public class JavacToolProvider implements ToolProvider {
    public String name() {
        return "javac";
    }

    public Optional description() {
        JavacMessages messages = new JavacMessages(Main.javacBundleName);
        return Optional.of(messages.getLocalizedString("javac.description"));
    }

    public int run(PrintWriter out, PrintWriter err, String... args) {
        Main compiler = new Main("javac", out, err);
        return compiler.compile(args).exitCode;
    }
}