[Jython-users] Jython/Java and Reflection

[<mi...@hi...>]

I am running into a problem trying to subclass a java class from
Jython2.0. The problem lies in the fact that the java class I extend from
uses reflection to implement the template method pattern. The methods it is
looking for is implemented in my jython class. Here is an example using the 
JUnit framework which illustrates my problem:

---- example.py ----
import java
import junit

class MyJavaClassTest(junit.framework.TestCase):

	def __init__(self, name):
		junit.framework.TestCase.__init__(self, name)

	def setUp(self):
		"@sig public void setUp()"
		pass

	def testMyJavaClass(self):
		"@sig public void testMyJavaClass()"
		pass

junit.textui.TestRunner.run(MyJavaClassTest("testMyJavaClass"))
---- end example.py ----

Running this from the command line I get:

$ cmd /c c:/devel/jython-2.1/jython.bat example.py
.F
Time: 0
There was 1 failure:
1) testMyJavaClass(org.python.proxies.__main__$MyJavaClassTest$1) "Method "testM
yJavaClass" not found"

FAILURES!!!
Tests run: 1,  Failures: 1,  Errors: 0

As you can see the JUnit TestCase class is using reflection to look for the
testMyJavaClass method. Will this example only work if I run jythonc? It
looks like the autogenerated proxy class is ignoring the "@sig"
information.

Also, with the upcoming 2.1 release, will function attributes be used to 
replace the "@sig" syntax?

--mike