useConstants tag in unstandard taglib

Hi,

I'm looking for the ability to use Java constants withint a JSP (without using scriptlet code). This seems to be possible with the useConstants tag available from the unstandard taglib:
http://jakarta.apache.org/taglibs/sandbox/doc/unstandard-doc/index.html#useConstants

However, I cannot seem to find any way to download this taglib. If it has been deprecated, has the useConstants tag been moved into another library?

Cheers,
Don