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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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 * 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
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 * accompanied this code).
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package javax.lang.model.util;

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

/**
 * A visitor of types based on their {@linkplain TypeKind kind} with
 * default behavior appropriate for source versions {@link
 * SourceVersion#RELEASE_9 RELEASE_9} through {@link
 * SourceVersion#RELEASE_14 RELEASE_14}.
 *
 * For {@linkplain
 * TypeMirror types} Xyz that may have more than one
 * kind, the visitXyz methods in this class delegate
 * to the visitXyzAsKind method corresponding to the
 * first argument's kind.  The visitXyzAsKind methods
 * 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 TypeKindVisitor6
 * @see TypeKindVisitor7
 * @see TypeKindVisitor8
 * @see TypeKindVisitor14
 * @since 9
 */
@SupportedSourceVersion(RELEASE_14)
public class TypeKindVisitor9 extends TypeKindVisitor8 {
    /**
     * Constructor for concrete subclasses to call; uses {@code null}
     * for the default value.
     */
    protected TypeKindVisitor9() {
        super(null);
    }

    /**
     * Constructor for concrete subclasses to call; uses the argument
     * for the default value.
     *
     * @param defaultValue the value to assign to {@link #DEFAULT_VALUE}
     */
    protected TypeKindVisitor9(R defaultValue) {
        super(defaultValue);
    }

    /**
     * {@inheritDoc}
     *
     * @implSpec This implementation calls {@code defaultAction}.
     *
     * @param t {@inheritDoc}
     * @param p {@inheritDoc}
     * @return  the result of {@code defaultAction}
     *
     * @since 10
     */
    @Override
    public R visitNoTypeAsModule(NoType t, P p) {
        return defaultAction(t, p);
    }
}