If a generic data type is returned from Java to JavaScript (for example, a subclass of one of the List implementations), and this subclass overrides a method causing a bridge method to be generated by javac, and this method is attempted to be invoked from JavaScript, then the new plug-in will report an ambiguous invocation because it appears that multiple methods all satisfy the incoming argument list.

This issue was reported on the java.net forum:

http://forums.java.net/jive/thread.jspa?threadID=35144&tstart=0