[Java] how to embed Jython

Embed Jython

if( ((String)langCombo.getSelectedItem()).equalsIgnoreCase("python") ) {
    SwingUtilities.invokeLater(() -> {
        try {
            PythonInterpreter pythonScript;   
            System.setProperty("python.import.site","false");
            pythonScript = new PythonInterpreter();
            pythonScript.set("instance", this);
            pythonScript.exec("def write(text): instance.outputPrint(text)\n");
            pythonScript.exec("def writeln(text): instance.outputPrintLn(text)\n");
            outputPrintLn("<START Python>");
            pythonScript.exec(textTab.getSelectedTextView().getText());
            outputPrintLn("<END Python>");
        } catch (Exception e) {
            e.printStackTrace();
            outputPrintLn("error\n" + e.getMessage());
        }  
    });
}