Does ajc rely on javac for generating Java bytecode (.class) files?
No. Some previous versions of AspectJ had this requirement. In AspectJ 1.0, javac can still be used as ajc back end by using the -usejavac flag. You can also run ajc in preprocessor mode to generate Java source (.java) files to be compiled using javac or another java compiler. Neither option is supported in AspectJ 1.1.