[FIXED] How do I run Python Scripts in Java with the ScriptEngine?

Issue

I'm trying to run Python Scripts in my Java Application with Jyton/ScriptEngine but it's not working. ScriptEngine does not find JythonScriptEngine.

public static void main(String[] Args) throws FileNotFoundException, ScriptException {
    PySystemState engineSys = new PySystemState();
    engineSys.path.append(Py.newString("C:/Users/User/AppData/Local/jython2.7.2/jython.jar"));
    Py.setSystemState(engineSys);
    StringWriter writer = new StringWriter();
    ScriptContext context = new SimpleScriptContext();
    context.setWriter(writer);
    ScriptEngineManager manager = new ScriptEngineManager();
    ScriptEngine engine = manager.getEngineByName("python");
    engine.eval(new FileReader("C:/*/MyScript.py"), context);
    System.out.println(engine.get("value"));}

I added Jython into my Project Libary.

But it didnt work.

I hope somebody can help me. Thank you in advance. :D

Solution

I have not worked with Jython library but its seems that it helps to get python libraries/interpreter in java code. Your code looks like you want to execute some python class and get result in Java. You can simply execute it as a shell command and get its result like following utility function:

public static String runSystemCommand(String fileToRun) throws IOException
    {
        Process p = Runtime.getRuntime().exec(fileToRun);
        BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));

        String result = input.lines().collect(Collectors.joining("\n"));

        input.close();

        return result;
    }

    public static void main(String[] args) throws Exception
    {
        System.out.println(runSystemCommand("python /home/saad/shell.py"));
    }

Answered By - saadeez
Answer Checked By - Marilyn (JavaFixing Volunteer)