try (StandardJavaFileManager mgr = compiler.getStandardFileManager(ds, null, null)) {
            List<String> options = buildOptions(dstDir, classPath);
            List<File> filesToCompile = outputSourceFilesToSourceDir(srcDir, classes);
            if (dstDir.exists() || dstDir.mkdirs()) {
                Iterable<? extends JavaFileObject> sources = mgr.getJavaFileObjectsFromFiles(filesToCompile);