running jython bytecode using java

Question

It looks like I\'m missing something.

When using Jython to run my Python code in Java, Java bytecode files are generated (test.py -> test@py.class).

Can I ru

Answer 1

Here's what works for me:

test_p.py:

def foo():
  print 'test from Python'

TestJ.java:

import org.python.core.PyFrame;
import org.python.core.PyFunctionTable;
import org.python.util.PythonInterpreter;

public class TestJ
{
  public static void main(String[] args)
  {
    final PythonInterpreter interpreter = new PythonInterpreter();

    interpreter.exec("import sys");

    try
      {
        final Class clazz = Class.forName("test_p$py");

        final java.lang.reflect.Constructor constructor
          = clazz.getConstructor(String.class);

        final PyFunctionTable module = (PyFunctionTable)constructor.newInstance("");

        final java.lang.reflect.Method method
          = clazz.getDeclaredMethod("foo$1",
                                    PyFrame.class,
                                    org.python.core.ThreadState.class);

        method.invoke(module,
                      (PyFrame)interpreter.eval("sys._getframe()").__tojava__(PyFrame.class),
                      org.python.core.Py.getThreadState());
      }
    catch (final ClassNotFoundException e)
      { e.printStackTrace(); }
    catch (final NoSuchMethodException e)
      { e.printStackTrace(); }
    catch (final InstantiationException e)
      { e.printStackTrace(); }
    catch (final IllegalAccessException e)
      { e.printStackTrace(); }
    catch (final java.lang.reflect.InvocationTargetException e)
      { e.printStackTrace(); }
  }
}

Compile test_p.py into test_p$py.class:

$JYTHON_HOME/jython $JYTHON_HOME/Lib/compileall.py .

Move test_p.py out of the way, to prove it's not being used:

mkdir hidden
mv test_p.py hidden/

Compile:

javac -cp $JYTHON_HOME/jython.jar TestJ.java

Test:

java -cp $JYTHON_HOME/jython.jar:. TestJ

Output:

test from Python