StyleSheetCache cache = new StyleSheetCache();

Console console = new Console() {
    public void showMessage(String message, MessageType messageType) {
        System.err.println(message);
    }
};

Converter converter = new Converter(cache, console);

• StyleSheetCache is a simple cache for the ditac XSLT 2.0 stylesheets. It is a thread-safe object which is intended to be shared by several Converters.
  Unlike StyleSheetCache, Converter is not thread-safe. Each thread must own its Converter. However, the run method of a Converter may be invoked several times.
• Console is a very simple interface. Implementing this interface allows to do whatever you want with the messages reported by a Converter.

if (!converter.registerFOP("/opt/fop/fop")) {
    return 1;
}

There are several methods which may be used to register an XSL-FO processor with a Converter. From high-level ones to low-level ones, these methods are: registerFOP , registerXEP , registerAHF , registerXFC , registerExternalFOConverter , registerFOConverter .

String[] args = {
    "-v",
    "-p", "number", "all",
    outFile.getPath(),
    inFile.getPath(),
};

return converter.run(args);