public void put(String key, Object value) {
change();
if (value == null) {
put(key, null);
}
put(key, value + "");
}
public void put(String key, String value) {
if (key.contains(":")) {
throw new IllegalArgumentException("Character ':' is invalid in a session key.");
}
change();
if (value == null) {
data.remove(key);
} else {
data.put(key, value);
}
}
public void clear() {
change();
data.clear();
}
public boolean remove(String key) {
change();
return data.remove(key) != null;
}