JSPWiki is developed and run on Sun's JDK versions. For various reasons, 
someone might want to use [alternative Java implementations]. Please list your experiences

[ebu]: A hard-core free software person asked me about JSPWiki with 
a free Java implementation. Any experience out there?

!Sun JDK 1.4

There is a slight incompatibility with JDK1.4: If you're using JDK1.4 AND you have a system where you have ISO-8859-1 and UTF-8 -encoded files mixed, then you WILL get into trouble, since it seems that Sun's decoding routines no longer throw IOExceptions when it detects corrupted UTF-8. This makes automatic recognition of the input stream a definite hassle. 

!Sun JDK 1.3.1

No known problems.