[Springframework-developer] Weird issue trying to run unit tests

[Colin S. <col...@ex...>]

I've build Spring now a number of time over the last couple of weeks, 
but tonight was the first time I actually tried to run the unit tests.

I am getting an incredibly puzzling error from ant saying it can't 
create the junit task
----
BUILD FAILED
file:E:/src/open/springframework/main/build.xml:238: Could not create 
task or ty
pe of type: junit.

Ant could not find the task or a class this task relies upon.
-----

I spent 15 minutes trying to figure this out, but have no clues as to 
what is going on. I am using the same ant settings as I've used in 
several dozen of my own projects and a number of open source projects, 
ie I have a batch file which adds ant to the path and sets ANT_HOME.

I though perhaps the ant.jar (which seems to be ant 1.5.3 recompiled 
some time this year) in the lib/ant dir was interfering somehow, but 
removing it makes no difference. Adding 'fork="true") to the junit call 
makes no difference.

Anybody seen something like this before?