junit.jar really ought to be removed from our repository. Due to
classloader issues, <junit> doesn't work with junit.jar anywhere but in
the classpath that launches Ant. The Ant best practice is to put
junit.jar in ANT_HOME/lib anyway. I have adjusted the build file that
I'll check in later to account for this.
I disagree that this is a "best practice." At best, it is a horrible workaround for two tools that ought to work better together, but don't, for reasons that no one has been able to explain compellingly.
By "best", I meant its the best alternative to dealing with it.
I haven't spent any time fiddling with the gory details of the classloader issue. The <junit> task is the highest profile one, but other tasks that require 3rd libraries suffer the same issue like <scp> and <ftd> for example.
The explanations have been made on the Ant e-mail lists - I'd have to dig to find the most technically detailed one and don't have it readily at hand.
What if you have different projects which use the same version of ANT but use different versions of JUnit? You're screwed.
That is a very unlikely occurrence. JUnit 3.8.1 has been the only necessary version for a long time. And you wouldn't be screwed, you'd just pull junit.jar out of ANT_HOME/lib but ensure that the one you wanted was in the classpath for each project's build... via build.bat/.sh scripts instead of using Ant's built-in launcher scripts directly.
What we've taken to doing is to "neuter" ANT by removing optional.jar, and add optional.jar to the lib/ directory of every project, along with junit. While this is not really a great practice either, it does provide more flexibility.
optional.jar? What version of Ant are you running?! That's pre-v1.6. optional.jar was split into separate JAR files for each 3rd party dependency.
All because of junit.jar you do that? Why can't all your projects use the same junit.jar?
Erik
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