Jython and Grasshopper : NullPointerException

Hello all,

I would like to use the Java Grasshopper agents platform
(www.grasshopper.de) together with Jython. If you start Grasshopper then you
can launch/create/start agents from a separate application. I would like to
rewrite this application in JPython (it is in Java at the moment). In order
to control the agency from the separate application you must create an
agency proxy. For this you need the address of the agency which is a
GrasshopperAddress object. So the first thing I have to do is to create this
GrasshopperAddress object. This is strait forward:

agencyAddress =
GrasshopperAddress("socket://localhost:7000/Eble/EvaluationArea")

After I try this line in the Jython console I get a null pointer exception:

Traceback (innermost last):
  File "<stdin>", line 1, in ?
java.lang.NullPointerException
 at org.python.core.PyJavaClass.setConstructors(PyJavaClass.java)
 at org.python.core.PyJavaClass.initConstructors(PyJavaClass.java)
 at org.python.core.PyJavaClass.__call__(PyJavaClass.java)
 at org.python.core.PyObject.__call__(PyObject.java)
 at org.python.pycode._pyx134.f$0(<stdin>:1)
 at org.python.pycode._pyx134.call_function(<stdin>)
 at org.python.core.PyTableCode.call(PyTableCode.java)
 at org.python.core.PyCode.call(PyCode.java)
 at org.python.core.Py.runCode(Py.java)
 at org.python.core.Py.exec(Py.java)
 at org.python.util.PythonInterpreter.exec(PythonInterpreter.java)
 at
org.python.util.InteractiveInterpreter.runcode(InteractiveInterpreter.java)
 at
org.python.util.InteractiveInterpreter.runsource(InteractiveInterpreter.java
)
 at
org.python.util.InteractiveInterpreter.runsource(InteractiveInterpreter.java
)
 at jbjython.ConsolePanel$FrameConsoleInterpreter.process(Unknown Source)
 at jbjython.ConsolePanel.textField_actionPerformed(Unknown Source)
 at jbjython.ConsolePanel.access$000(Unknown Source)
 at jbjython.ConsolePanel$1.actionPerformed(Unknown Source)
 at javax.swing.JTextField.fireActionPerformed(JTextField.java:421)
 at javax.swing.JTextField.postActionEvent(JTextField.java:586)
 at javax.swing.JTextField$NotifyAction.actionPerformed(JTextField.java:696)
 at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1702)
 at javax.swing.JComponent.processKeyBinding(JComponent.java:2156)
 at javax.swing.JComponent.processKeyBindings(JComponent.java:2182)
 at javax.swing.JComponent.processKeyEvent(JComponent.java:2119)
 at java.awt.Component.processEvent(Component.java:3555)
 at java.awt.Container.processEvent(Container.java:1167)
 at java.awt.Component.dispatchEventImpl(Component.java:2595)
 at java.awt.Container.dispatchEventImpl(Container.java:1216)
 at java.awt.Component.dispatchEvent(Component.java:2499)
 at java.awt.LightweightDispatcher.processKeyEvent(Container.java:2162)
 at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2142)
 at java.awt.Container.dispatchEventImpl(Container.java:1203)
 at java.awt.Window.dispatchEventImpl(Window.java:918)
 at java.awt.Component.dispatchEvent(Component.java:2499)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:336)
 at
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.ja
va:134)
 at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java
:101)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:96)
 at java.awt.EventDispatchThread.run(EventDispatchThread.java:88)

Could this have to do with Jython? As you may realize from the exceptions, I
use Jython with JBJython from JBuilder, but it seems to me that the
exception occurs earlier, in Jython. I have tested JBJython with a small
Java test package and it seems to work fine.


Any help would be great.




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