IcedTea plugin is not detected or usable by konqueror. There is no reason why it shouldn't work, and this issue should be looked into.
Konqueror uses NPAPI to support mozilla plugins. IcedTea plugin relies on the LiveConnect api to work which makes it incompatible with konqueror. However, Konqueror supports java applets through KDE Java Applet Server (KJAS). Please see http://www.konqueror.org/javahowto/ for details. Here are the steps to get Java working with konqueror: 1. Make sure you have a JRE/JDK installed 2. In konqueror, select Settings->Configure Konqueror 3. Select 'Java & JavaScript' under Web Browsing. 4. On the Java tab, check 'Enable Java Globally' 5. Set the 'Path to Java executable' to '/usr/bin/java', or to your JRE's java program (the documentation says that the defualt 'java' should work, but it doesnt seem to)
Since konqueror has no OJI support, getting IcedTeaPlugin work to with it would be pretty much impossible without a significant rewrite to use NPAPI. Closing this as CANTFIX.