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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.nio.charset.Charset;
import javax.tools.DiagnosticListener;
import javax.tools.JavaFileObject;

import com.sun.tools.javac.file.JavacFileManager;
import com.sun.tools.javac.util.Context;

/**
 *  javap's implementation of JavaFileManager.
 *
 *  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 JavapFileManager extends JavacFileManager {
    private JavapFileManager(Context context, Charset charset) {
        super(context, true, charset);
        setSymbolFileEnabled(false);
    }

    public static JavapFileManager create(final DiagnosticListener dl, PrintWriter log) {
        Context javac_context = new Context();

        if (dl != null)
            javac_context.put(DiagnosticListener.class, dl);
        javac_context.put(com.sun.tools.javac.util.Log.errKey, log);

        return new JavapFileManager(javac_context, null);
    }
}