lucy24 - 5:30 am on Dec 12, 2012 (gmt 0)
Can you remember what came after the Java? My htaccess says "Java/" -- and a quick riffle through logs says that the usual robotic "Java" UA is "Java/1.6.0_\d+" where the number after the lowline varies. But if you block "Java/1.6.0" then someone will come along with a Java/1.7. so the slash alone was a compromise.