Java.lang.UnsupportedOperationException coming out of ant jwsc task

Question

Hello!
I'm trying to stand up a simple example web service so that I can 'instrument' it with a QOS monitoring application. (The goal here is to learn to use the monitoring app.) I'm pretty sure that I've got a usable piece of code for a web service; I can use Endpoint.publish and get results, and I copied a test stub I found somewhere to use a QName to test it and that works.
I'm getting the above referenced error coming out of my build.xml file when I try to compile this as a web service inside the WL environment. The error message reads as being generated by line 11 which reads 'destdir="./target/classes" '. It's also got the closing '>' from the '<jwsc' declaration so that is likely why it's this line that's complaining.
The stacktrace references 'Collections.$SingletonSet$.Remove()' which is being called out of jwsctask. It then progresses through jwsLoader and jwsMudule before the stack goes through a bunch of org.apache.tools.ant classes. It's the remove() that's got me worried; I can't find any documentation on SingletonSet as a nested class of Collections, but it's reasonable to think that remove() is actually an UnsupportedOperation. That would mean that I've found a bug as opposed to having just done some stupid newbie thing. I'd much rather be a stupid newbie. :-)
Anything that the collected wisdom could point out to me would be greatly appreciated. TIA
-Dan Fox

Answer 1

See if this helps -
Exception while accesing a sample page