You call them by what looks like a variable call - see http://velocity.apache.org/engine/releases/velocity-1.5/user-guide.html
It's a lot to take in, but jump to the header "References" and the sub-header "Methods" to see how to call java functions
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The Answers software is really crummy at handling urls - the url given is correct, but it's adding a non-breaking space to the end of it - try removing that and it'll work. I've tried editing it off, but answers adds it back in.
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