Changed registration of a different class with the same ID to a debug…

… message.

The use case is in KryoNet's RMI, where we want to send the implementation of an object on the server as if it were the interface. This means the interface and the implementation use the same class ID.

src/com/esotericsoftware/kryo/Kryo.java

@@ -421,8 +421,8 @@ public Registration register (Registration registration) {
  if (id < 0) throw new IllegalArgumentException("id must be > 0: " + id);
 
  Registration existing = getRegistration(registration.getId());
- if (existing != null && existing.getType() != registration.getType()) {
- throw new KryoException("An existing registration with a different type already uses ID: " + registration.getId()
+ if (DEBUG && existing != null && existing.getType() != registration.getType()) {
+ debug("An existing registration with a different type already uses ID: " + registration.getId()
  + "\nExisting registration: " + existing + "\nUnable to set registration: " + registration);
  }