hi, I tested the mod_jk 1.2.16 with 3 instances of tomcats (ver 5.5.15) and one httpd (2.0.58 and 2.2.2 one by one). I tested it with flood (using the tomcat tester application) and all the requests to httpd are routed to tomcats in a balanced manner and replies are received properly.
+1 for release amila.