private static Path findSaxonJar(Path xsltDebuggerClassesRoot, String jarFile) {
    Path transformerFile = xsltDebuggerClassesRoot.getParent().resolve("rt").resolve(jarFile);
    if (!Files.exists(transformerFile)) {
      //running from sources
      Path libDir = getPluginEngineDirInSources().resolve("impl/lib");
      transformerFile = libDir.resolve(jarFile);
      assert Files.exists(transformerFile) : transformerFile.toAbsolutePath().toString();
    }
    return transformerFile;
  }
private static Path findSaxonJar(Path xsltDebuggerClassesRoot, String jarFile)