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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, 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,
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package javax.lang.model.element;

import javax.lang.model.util.Elements;
import javax.lang.model.type.TypeMirror;
import javax.lang.model.type.TypeKind;

/**
 * Represents a field, {@code enum} constant, method or constructor
 * parameter, local variable, resource variable, or exception
 * parameter.
 *
 * @author Joseph D. Darcy
 * @author Scott Seligman
 * @author Peter von der Ahé
 * @since 1.6
 */
public interface VariableElement extends Element {
    /**
     * {@return the type of this variable}
     *
     * Note that the types of variables range over {@linkplain
     * TypeKind many kinds} of types, including primitive types,
     * declared types, and array types, among others.
     *
     * @see TypeKind
     */
    @Override
    TypeMirror asType();

    /**
     * Returns the value of this variable if this is a {@code final}
     * field initialized to a compile-time constant.  Returns {@code
     * null} otherwise.  The value will be of a primitive type or a
     * {@code String}.  If the value is of a primitive type, it is
     * wrapped in the appropriate wrapper class (such as {@link
     * Integer}).
     *
     * Note that not all {@code final} fields will have
     * constant values.  In particular, {@code enum} constants are
     * not considered to be compile-time constants.  To have a
     * constant value, a field's type must be either a primitive type
     * or {@code String}.
     *
     * @return the value of this variable if this is a {@code final}
     * field initialized to a compile-time constant, or {@code null}
     * otherwise
     *
     * @see Elements#getConstantExpression(Object)
     * @jls 15.29 Constant Expressions
     * @jls 4.12.4 final Variables
     */
    Object getConstantValue();

    /**
     * {@return the simple name of this variable element}
     *
     * For method and constructor parameters, the name of each
     * parameter must be distinct from the names of all other
     * parameters of the same executable.  If the original source
     * names are not available, an implementation may synthesize names
     * subject to the distinctness requirement above.
     */
    @Override
    Name getSimpleName();

    /**
     * {@return the enclosing element of this variable}
     *
     * The enclosing element of a method or constructor parameter is
     * the executable declaring the parameter.
     */
    @Override
    Element getEnclosingElement();
}