If this is the servlet code
java.util.Map musicMap = new java.util.HashMap();
musicMap.put(�Ambient�, �Zero 7�);
musicMap.put(�Surf�, �Tahiti 80�);
musicMap.put(�DJ�, �BT�);
musicMap.put(�Indie�, �Frou Frou�);
request.setAttribute(�musicMap�, musicMap);
request.setAttribute(�Genre�, �Ambient�);
Then why this work
Music is ${musicMap[Genre]}
and this do not works
Music is ${musicMap[�Genre�]}