1. The only plug-ins that are supported are Acrobat and Flash Player.
You can use the AIR 2 NativeProcess API to launch a Java application and communicate with it using the standard IO stream. This does require distributing your app as a native executable rather than an AIR app. Another option is to communicate between AIR and Java using sockets.
3. There is no separate Flash SDK. You can get all the functionality to create ActionScript apps that run in Flash Player using the Flex SDK. Simply create your actionscript files and compile with mxmlc for the web or amxmlc for AIR.
Got to this thread a bit late. I just posted the same query in another thread as well.
We have some software purchased as an applet. Now we want to create AIR app version of our flash based web application. What all are the possibilities do I have to get applet working in AIR app?
Hi Vivak you can't do that (at least based on my exploration). Reply is in the thread after me. So unless Adobe provide a way for integrating Java code into their AIR, I doubt there is much we can do.