Problem: In the JUnit optional task, the <classpath> nested tag does not have
the desired effect for JUnit with fork="no" (the default).  Instead of coming
from the tag, JUnit's classpath comes from the $CLASSPATH system environment
variable.

Workaround: use the fork="yes" option or set the $CLASSPATH environment
variable.

Another user report follows, detailing the same problem and another workaround.
(He and I are using the same versions of software, but I'm running on Solaris.)

--

From: opensourcetim@yahoo.com (Tim Rapp)
Newsgroups: comp.lang.java
Subject: Re: JUnit 3.7 with Ant 1.4 Property definitions - doesn't work
Date: 26 Oct 2001 12:23:25 -0700
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christopher.ross@fmr.com (christopher) wrote in message
news:<170adb52.0110170416.231a2c50@posting.google.com>...
> My Ant JUnits always fail with an Ant Property defined CLASSPATH.
>
> The error is 'cannot find the optional.jar' - 
> which is on the Property defined CLASSPATH.  These
> same Property definitions converted to env vars work great!  I have
> also tried some <systemproperty> and <classpath> overrides in the
> JUnit task itself to no avail.

Thanks Christopher, I had the same problem.  To fix, I added
"set CLASSPATH=C:\myproject\lib\junit.jar" to my NT script that calls Ant.  
I still have a <classpath> tag in my <junit> task.  Excerpts from my
build.xml file (unnecessary details replaced with ...) are below:

<path id="test.classpath" >
        <pathelement location="${lib}/junit.jar" />
        <pathelement location="${lib}/httpunit.jar" />
        <pathelement location="${lib}/parser.jar" />
        <pathelement location="${classes}" />
        <path refid="tomcat.classpath" />
        <path refid="mysql.classpath" />
</path>
...
<junit ... >
        <classpath>
                <path refid="test.classpath" />
        </classpath>
        ...
</junit>

Seems like this should be added to the Ant documentation for the 
<junit> task.  FYI, I'm running Ant 1.4.1, JUnit 3.7, Win2k Pro, 
and JDK 1.3.1.