History Cleaner, Java cache, and Vista (PT v.1.8.0.460)
History Cleaner does not find the Java cache on my Vista system.
It is located at C:\Users\Owner\AppData\LocalLow\Sun\Java\Deployment\cache and contains almost 340 MB, most of which is probably removable.
Added note: It seems Java 6 has moved its cache from C:\Windows\Sun\Java\Deployment\... to C\:\Users\Owner\AppData\LocalLow\Sun\Java\Deployment\cache\6.0\.
Added note: On my XP Pro system, History Cleaner successfully finds the Java 6 cache at C\:\Documents and Settings\Owner\application data\Sun\Java\Deployment\cache\6.0\.