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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) 2005, 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,
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 *
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package javax.lang.model.element;

import java.util.List;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.type.TypeVariable;

/**
 * Represents a formal type parameter of a generic class, interface, method,
 * or constructor element.
 * A type parameter declares a {@link TypeVariable}.
 *
 * @see TypeVariable
 * @since 1.6
 */
public interface TypeParameterElement extends Element {
    /**
     * {@return the {@linkplain TypeVariable type variable}
     * corresponding to this type parameter element}
     *
     * @see TypeVariable
     */
    @Override
    TypeMirror asType();

    /**
     * {@return the generic class, interface, method, or constructor that is
     * parameterized by this type parameter}
     */
    Element getGenericElement();

    /**
     * Returns the bounds of this type parameter.
     * These are the types given by the {@code extends} clause
     * used to declare this type parameter.
     * If no explicit {@code extends} clause was used,
     * then {@code java.lang.Object} is considered to be the sole bound.
     *
     * @return the bounds of this type parameter, or an empty list if
     * there are none
     */
    List getBounds();

    /**
     * {@return the {@linkplain TypeParameterElement#getGenericElement
     * generic element} of this type parameter}
     */
    @Override
    Element getEnclosingElement();
}