It looks like you are using the generic JBoss AS support built into Eclipse. I recommend that you install JBoss Tools and try again with that. You will have to create a new Server within Eclipse using the options that JBoss Tools provides.
http://www.jboss.org/tools/download/installation/update_3_2.html
Also, what JDK version is being used to run Eclipse? You can find this out by running the folowing from a command prompt:
c:\windows\system32\java -version