sclass JavaCompiler {
  S javaCompilerOutput;
  
  S compileJava(File srcDir, List<File> libraries, File classesDir) throws IOException {
    ++compilations;

    // collect sources

    List<File> sources = new ArrayList<File>();
    if (verbose) System.out.println("Scanning for sources in " + srcDir.getPath());
    scanForSources(srcDir, sources, true);
    if (sources.isEmpty())
      throw new IOException("No sources found");

    // compile

    File optionsFile = File.createTempFile("javac", "", javaxTempDir());
    try {
      if (verbose) System.out.println("Compiling " + sources.size() + " source(s) to " + classesDir.getPath());
      if (verbose) System.out.println("Libraries: " + libraries);
      String options = "-d " + bashQuote(classesDir.getPath());
      libraries.add(pathToJavaxJar());
      writeOptions(sources, libraries, optionsFile, options);
      classesDir.mkdirs();
      invokeJavaCompiler(optionsFile);
    } finally {
      optionsFile.delete();
    }
  }
}