fixed Method Initializing. Setting Datafields serverAddress and serverPort.

#24

client/src/main/java/ch/zhaw/pm2/multichat/client/ClientConnectionHandler.java

@@ -34,9 +34,16 @@ public class ClientConnectionHandler extends ConnectionHandler implements Runnab
     }
 
     public void initialize(String serverAddress, int serverPort, String userName) throws IOException {
-        state = new SimpleObjectProperty<>(NEW);
-        setConnection(NetworkHandler.openConnection(serverAddress, serverPort));
+        this.state = new SimpleObjectProperty<>(NEW);
+        this.serverAddress = new SimpleStringProperty(serverAddress);
+        this.serverPort = new SimpleIntegerProperty(serverPort);
         this.userName = new SimpleStringProperty((userName == null || userName.isBlank())? USER_NONE : userName);
+        try {
+            setConnection(NetworkHandler.openConnection(this.serverAddress.get(), this.serverPort.get()));
+        } catch (IOException e) {
+            messages.addMessage(new Message(Message.MessageType.ERROR,null,null,e.getMessage()));
+            System.out.println("ERROR: " + e.getMessage());
+        }
     }
 
     public SimpleStringProperty getServerAddressProperty() { return serverAddress; }