+1 Both enterprise Wiki's and my private Wiki are on 1.5 and 1.6 respectively.
A note on backwards compatibility: run the old stuff in a virtual machine, if that's too much hassle migrate the Wiki into its own box. Gets rid of annoying problems like interference. And at least on Linux boxes its perfectly fine to run multiple JDK's parallel. If there is more than one application on JBoss/Tomcat or whatever, Glassfish or an alternative webserver should solve the dependencies. Cheers, Joerg
