http://www.codehaus.org/ is no longer a supported site. No pointer to a new site for MVEL is mentioned. The github site: https://github.com/mvel/mvel has source and a few trivial samples but no reference.
Where is the MVEL Language Reference found?
6.6k views Asked by rmp AtThere are 5 answers
You can find the complete Mvel reference in this archive: https://web.archive.org/web/20141017203926/http://mvel.codehaus.org/MVEL+2.0+Operators
I was struggled with this whole website content is gone issue. I found this from the wiki, not much info but hope it's helpful for you before we have another site can redirect to. https://en.wikipedia.org/wiki/MVEL_Language_Guide
I have arranged the documentation into markdown format and hosted a HTML version here: http://mvel.documentnode.com/
Please feel free to fork from here: https://github.com/jiakuan/mvel-doc in case anything in the doc needs to be improved.
Check out this issue on the MVEL github repo: https://github.com/mvel/mvel/issues/101
The current documentation is here: http://mvel.documentnode.com/
It has been deleted from Wikipedia as well, and moved to Wikisource: MVEL Language Guide