example of exception handling

src/main/java/chat/ChatServiceImpl.java

@@ -48,9 +48,20 @@ public class ChatServiceImpl extends ChatServiceImplBase {
                     //we exclude the one which is sending the message
                     if(!observer.equals(responseObserver))
                         //we simply forward the message
+                        try {
+
                             observer.onNext(ChatMessage.newBuilder().setMessage(message).setFrom(from).build());
 
                         }
+                        catch(io.grpc.StatusRuntimeException e){
+                            //peer no longer available
+                            synchronized (observers){
+
+                                observers.remove(responseObserver);
+
+                            }
+                        }
+                }
 
             }