Empty string for value="" valid in c:set?

[Allen Williams]

My JSP is throwing an exception that seems to be in an included file. I say seems, because the file name and page number are messed up. Anyway, I think I've tracked it down by incrementally commenting stuff out to a tag that looks like this:

<c:set var="open" value="" />

So, my question is: is it illegal to have a zero-length string as a value? Seems odd, but when I comment out a line like this, I get further.

TIA

[Allen Williams]

Sorry. Never mind. I had var="", not value="" (well, I had both, it just took me a while to see it).