[Jython-users] Problem with subclassing Java class

[Kent J. <kjo...@tr...>]

Hello,

I am having a problem in Jython-2.1a1 subclassing a Java class that 
has overloaded methods.

The setup is a little complicated.

I have a Java class SortedProperties with a nested class 
IteratorCallback. IteratorCallback has these two methods:

class IteratorCallback {
     public void startLanguagePair(SortedProperties.LanguagePair inPair)
     {
	// Forward to two-argument version
	startLanguagePair(inPair.text, inPair.userClass);
     }

     public void startLanguagePair(String inName, String inUserClass)
     {
	// Default implementation does nothing
     }
}

SortedProperties has a method iterate(IteratorCallback, boolean) that 
calls the one-argument startLanguagePair.

I am using this in a jython servlet using PyServlet. Here is the 
callback class:

class Titlelister(SortedProperties.IteratorCallback):
	def __init__(self, inPage):
		self.page = inPage

	def startLanguagePair(self, inPair):
		self.page.add(Heading(2, inPair.text))

#	def startLanguagePair(self, inText, inUserClass):
#		self.page.add(Heading(2, inText))


This version, using the one-argument startLanguagePair, works fine. 
If I comment out the first startLanguagePair and uncomment the second 
one, I get the error

   File ".\FileBase\jython\TitleTest.py", line 28, in doGet
TypeError: startLanguagePair() takes at least 3 arguments (2 given)

line 28 is
	sortedProps.iterate(Titlelister(page), 0)

It looks like the jython call mechanism is missing the base class 
method somehow.

I'm not sure if I am doing something wrong or if there is a bug here.

Kent Johnson                   Transparent Language, Inc.
kjo...@tr...       http://www.transparent.com