If you try to install JBDS 4.1.1 w/ JDK7, you get told "The directory c:\program files (x86)\java\jre7\ contains a "1.7.0_01" Java VM. It needs to be a Java 5 compatible version of Java."
Meanwhile the installer (page 4 of 9) states "JBoss Developer Studio works with Java 6".
Seems like these two messages should be in alignment about requiring JDK6, not 5.