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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) 2011, 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
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package javax.lang.model.util;

import javax.annotation.processing.SupportedSourceVersion;
import javax.lang.model.SourceVersion;
import javax.lang.model.type.IntersectionType;
import static javax.lang.model.SourceVersion.*;

/**
 * A simple visitor of types with default behavior appropriate for
 * source versions {@link SourceVersion#RELEASE_9 RELEASE_9} through
 * {@link SourceVersion#RELEASE_14 RELEASE_14}.
 *
 * Visit methods corresponding to {@code RELEASE_9} and earlier
 * language constructs call {@link #defaultAction defaultAction},
 * passing their arguments to {@code defaultAction}'s corresponding
 * parameters.
 *
 * @apiNote
 * Methods in this class may be overridden subject to their general
 * contract.
 *
 * @param  the return type of this visitor's methods.  Use {@link
 *            Void} for visitors that do not need to return results.
 * @param  the type of the additional parameter to this visitor's
 *            methods.  Use {@code Void} for visitors that do not need an
 *            additional parameter.
 *
 * @see 
 * Compatibility note for subclasses
 * @see SimpleTypeVisitor6
 * @see SimpleTypeVisitor7
 * @see SimpleTypeVisitor8
 * @see SimpleTypeVisitor14
 * @since 9
 */
@SupportedSourceVersion(RELEASE_14)
public class SimpleTypeVisitor9 extends SimpleTypeVisitor8 {
    /**
     * Constructor for concrete subclasses; uses {@code null} for the
     * default value.
     */
    protected SimpleTypeVisitor9(){
        super(null);
    }

    /**
     * Constructor for concrete subclasses; uses the argument for the
     * default value.
     *
     * @param defaultValue the value to assign to {@link #DEFAULT_VALUE}
     */
    protected SimpleTypeVisitor9(R defaultValue){
        super(defaultValue);
    }
}