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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) 2006, 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,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package javax.tools;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;
import java.net.URI;
import java.util.Objects;

/**
 * Forwards calls to a given file object.  Subclasses of this class
 * might override some of these methods and might also provide
 * additional fields and methods.
 *
 * Unless stated otherwise, references in this class to "this file object"
 * should be interpreted as referring indirectly to the {@link #fileObject delegate file object}.
 *
 * @param  the kind of file object forwarded to by this object
 * @since 1.6
 */
public class ForwardingFileObject implements FileObject {

    /**
     * The file object to which all methods are delegated.
     */
    protected final F fileObject;

    /**
     * Creates a new instance of {@code ForwardingFileObject}.
     * @param fileObject delegate to this file object
     */
    protected ForwardingFileObject(F fileObject) {
        this.fileObject = Objects.requireNonNull(fileObject);
    }

    @Override
    public URI toUri() {
        return fileObject.toUri();
    }

    @Override
    public String getName() {
        return fileObject.getName();
    }

    /**
     * @throws IllegalStateException {@inheritDoc}
     * @throws UnsupportedOperationException {@inheritDoc}
     * @throws IOException {@inheritDoc}
     */
    @Override
    public InputStream openInputStream() throws IOException {
        return fileObject.openInputStream();
    }

    /**
     * @throws IllegalStateException {@inheritDoc}
     * @throws UnsupportedOperationException {@inheritDoc}
     * @throws IOException {@inheritDoc}
     */
    @Override
    public OutputStream openOutputStream() throws IOException {
        return fileObject.openOutputStream();
    }

    /**
     * @throws IllegalStateException {@inheritDoc}
     * @throws UnsupportedOperationException {@inheritDoc}
     * @throws IOException {@inheritDoc}
     */
    @Override
    public Reader openReader(boolean ignoreEncodingErrors) throws IOException {
        return fileObject.openReader(ignoreEncodingErrors);
    }

    /**
     * @throws IllegalStateException {@inheritDoc}
     * @throws UnsupportedOperationException {@inheritDoc}
     * @throws IOException {@inheritDoc}
     */
    @Override
    public CharSequence getCharContent(boolean ignoreEncodingErrors) throws IOException {
        return fileObject.getCharContent(ignoreEncodingErrors);
    }

    /**
     * @throws IllegalStateException {@inheritDoc}
     * @throws UnsupportedOperationException {@inheritDoc}
     * @throws IOException {@inheritDoc}
     */
    @Override
    public Writer openWriter() throws IOException {
        return fileObject.openWriter();
    }

    @Override
    public long getLastModified() {
        return fileObject.getLastModified();
    }

    @Override
    public boolean delete() {
        return fileObject.delete();
    }
}