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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, 2021, 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 com.sun.source.util;

import com.sun.source.tree.*;

/**
 * Provides methods to obtain the position of a Tree within a CompilationUnit.
 * A position is defined as a simple character offset from the start of a
 * CompilationUnit where the first character is at offset 0.
 *
 * @author Peter von der Ahé
 * @since 1.6
 */
public interface SourcePositions {

    /**
     * Returns the starting position of tree within file.  If tree is not found within
     * file, or if the starting position is not available,
     * returns {@link javax.tools.Diagnostic#NOPOS}.
     * The returned position must be at the start of the yield of this tree, that
     * is for any sub-tree of this tree, the following must hold:
     *
     * 
     * {@code getStartPosition(file, tree) <= getStartPosition(file, subtree)} or 

     * {@code getStartPosition(file, tree) == NOPOS} or 

     * {@code getStartPosition(file, subtree) == NOPOS}
     * 
     *
     * @param file CompilationUnit in which to find tree
     * @param tree tree for which a position is sought
     * @return the start position of tree
     */
     long getStartPosition(CompilationUnitTree file, Tree tree);

    /**
     * Returns the ending position of tree within file.  If tree is not found within
     * file, or if the ending position is not available,
     * returns {@link javax.tools.Diagnostic#NOPOS}.
     * The returned position must be at the end of the yield of this tree,
     * that is for any sub-tree of this tree, the following must hold:
     *
     * 
     * {@code getEndPosition(file, tree) >= getEndPosition(file, subtree)} or 

     * {@code getEndPosition(file, tree) == NOPOS} or 

     * {@code getEndPosition(file, subtree) == NOPOS}
     * 
     *
     * In addition, the following must hold:
     *
     * 
     * {@code getStartPosition(file, tree) <= getEndPosition(file, tree)} or 

     * {@code getStartPosition(file, tree) == NOPOS} or 

     * {@code getEndPosition(file, tree) == NOPOS}
     * 
     *
     * @param file CompilationUnit in which to find tree
     * @param tree tree for which a position is sought
     * @return the end position of tree
     */
     long getEndPosition(CompilationUnitTree file, Tree tree);

}