Calling methods in derived classes throws exception when executing scripts via the javax.script api

[Jochen Fischer-2]

Hi!

When I execute the following simple script from inside java using the
java.script api I get aTypeError exception (see below).

#---------------------------
from java.lang import Object

class MyClass(Object):
     def __init__(self, foo):
         print foo

c = MyClass("Hello from Jython")
#---------------------------

If I execute the same script directly from Jython everything works as
expected. Is there anything wrong in what I'm doing or this this a major
issue in Jython 2.5.1?

Previously I was using Jython 2.1/2.2.1 inside ANT for scripting. When
calling this script via the old BSF binding everything works well. But
starting with Jython 2.5 it is not possible to use the BSF mechanism
anymore due to the fact that the PyInstance class has been removed. With
Jython 2.5.x it is necessary to use the scripting API from Java 1.6.
That works well as long as I'm not deriving any Jython class from a Java
class.

Can anyone give me a hint to avoid this problem when using Jython 2.5
from Ant?

Thanks
Jochen

Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
         at
org.python.jsr223.PyScriptEngine.scriptException(PyScriptEngine.java:182)
         at org.python.jsr223.PyScriptEngine.eval(PyScriptEngine.java:43)
         at org.python.jsr223.PyScriptEngine.eval(PyScriptEngine.java:48)
         at
javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:232)
         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
         at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
         at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
         at java.lang.reflect.Method.invoke(Method.java:597)
         at
org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java:175)
         at org.python.core.PyObject.__call__(PyObject.java:355)
         at org.python.core.PyMethod.__call__(PyMethod.java:215)
         at
org.python.core.PyMethod.instancemethod___call__(PyMethod.java:221)
         at org.python.core.PyMethod.__call__(PyMethod.java:206)
         at org.python.core.PyObject.__call__(PyObject.java:397)
         at org.python.core.PyObject.__call__(PyObject.java:401)
         at org.python.pycode._pyx36.f$0(<stdin>:1)
         at org.python.pycode._pyx36.call_function(<stdin>)
         at org.python.core.PyTableCode.call(PyTableCode.java:165)
         at org.python.core.PyCode.call(PyCode.java:18)
         at org.python.core.Py.runCode(Py.java:1204)
         at org.python.core.Py.exec(Py.java:1248)
         at
org.python.util.PythonInterpreter.exec(PythonInterpreter.java:181)
         at
org.python.util.InteractiveInterpreter.runcode(InteractiveInterpreter.java:89)
         at
org.python.util.InteractiveInterpreter.runsource(InteractiveInterpreter.java:70)
         at
org.python.util.InteractiveInterpreter.runsource(InteractiveInterpreter.java:46)
         at
org.python.util.InteractiveConsole.push(InteractiveConsole.java:110)
         at
org.python.util.InteractiveConsole.interact(InteractiveConsole.java:90)
         at org.python.util.jython.run(jython.java:316)
         at org.python.util.jython.main(jython.java:129)
Caused by: Traceback (most recent call last):
   File "<script>", line 7, in <module>
TypeError: org.python.proxies.__main__$MyClass$11(): expected 0 args; got 1

         at
org.python.core.PyException.fillInStackTrace(PyException.java:70)
         at java.lang.Throwable.<init>(Throwable.java:181)
         at java.lang.Exception.<init>(Exception.java:29)
         at java.lang.RuntimeException.<init>(RuntimeException.java:32)
         at org.python.core.PyException.<init>(PyException.java:46)
         at org.python.core.PyException.<init>(PyException.java:43)
         at org.python.core.PyException.<init>(PyException.java:61)
         at org.python.core.Py.TypeError(Py.java:195)
         at
org.python.core.PyReflectedFunction.throwError(PyReflectedFunction.java:195)
         at
org.python.core.PyReflectedFunction.throwArgCountError(PyReflectedFunction.java:248)
         at
org.python.core.PyReflectedFunction.throwError(PyReflectedFunction.java:305)

javax.script.ScriptException: javax.script.ScriptException: TypeError:
org.python.proxies.__main__$MyClass$11(): expected 0 args; got 1 in
<script> at line number 7

------------------------------------------------------------------------------
Come build with us! The BlackBerry® Developer Conference in SF, CA
is the only developer event you need to attend this year. Jumpstart your
developing skills, take BlackBerry mobile applications to market and stay
ahead of the curve. Join us from November 9-12, 2009. Register now!
http://p.sf.net/sfu/devconf
_______________________________________________
Jython-users mailing list
Jython-users@...
https://lists.sourceforge.net/lists/listinfo/jython-users