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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) 2012, 2016, 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
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 */

package com.sun.tools.sjavac;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Writer;
import java.net.URI;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

import com.sun.tools.sjavac.comp.CompilationService;
import com.sun.tools.sjavac.options.Options;
import com.sun.tools.sjavac.pubapi.PubApi;

/**
 * The copy file transform simply copies a matching file from -src to -d .
 * Such files are typically images, xml documents and other data files.
 *
 *  This is NOT part of any supported API.
 *  If you write code that depends on this, you do so at your own risk.
 *  This code and its internal interfaces are subject to change or
 *  deletion without notice.
 */
public class CopyFile implements Transformer {

    public void setExtra(String e) {
    }

    public void setExtra(Options a) {
    }

    public boolean transform(CompilationService compilationService,
                             Map> pkgSrcs,
                             Set visibleSrcs,
                             Map> oldPackageDependents,
                             URI destRoot,
                             Map>    packageArtifacts,
                             Map>> packageDependencies,
                             Map>> packageCpDependencies,
                             Map packagePubapis,
                             Map dependencyPubapis,
                             int debugLevel,
                             boolean incremental,
                             int numCores)
    {
        boolean rc = true;
        String dest_filename;
        File dest;

        for (String pkgName : pkgSrcs.keySet()) {
            String pkgNameF = Util.toFileSystemPath(pkgName);
            for (URI u : pkgSrcs.get(pkgName)) {
                File src = new File(u);
                File destDir;
                destDir = new File(destRoot.getPath()+File.separator+pkgNameF);
                dest_filename = destRoot.getPath()+File.separator+pkgNameF+File.separator+src.getName();
                dest = new File(dest_filename);

                if (!destDir.isDirectory()) {
                    if (!destDir.mkdirs()) {
                       Log.error("Error: The copier could not create the directory "+
                                           destDir.getPath());
                        return false;
                    }
                }

                Set as = packageArtifacts.get(pkgName);
                if (as == null) {
                    as = new HashSet<>();
                    packageArtifacts.put(pkgName, as);
                }
                as.add(dest.toURI());

                if (dest.exists() && dest.lastModified() > src.lastModified()) {
                    // A copied file exists, and its timestamp is newer than the source.
                    continue;
                }

                Log.info("Copying "+pkgNameF+File.separator+src.getName());

                try (InputStream fin = new FileInputStream(src);
                     OutputStream fout = new FileOutputStream(dest)) {
                    byte[] buf = new byte[1024];
                    int len;
                    while ((len = fin.read(buf)) > 0){
                        fout.write(buf, 0, len);
                    }
                }
                catch(IOException e){
                    Log.error("Could not copy the file "+src.getPath()+" to "+dest.getPath());
                    rc = false;
                }
            }
        }
        return rc;
    }
}