diff --git a/ws2012/P2P/uebungen/4/src/node/Node.java b/ws2012/P2P/uebungen/4/src/node/Node.java
index eada9491..629da466 100644
--- a/ws2012/P2P/uebungen/4/src/node/Node.java
+++ b/ws2012/P2P/uebungen/4/src/node/Node.java
@@ -25,9 +25,9 @@ public class Node {
 
     private String name = "Not initialized";
 
-	private List<SocketAddress> neighbors = new ArrayList<>();
+    private List<SocketAddress> neighbors = new ArrayList<SocketAddress>();
 
-	private Map<Integer, Ack> acks = new HashMap<>();
+    private Map<Integer, Ack> acks = new HashMap<Integer, Ack>();
 
 	private volatile Thread thread;
 	private UDPHandler udpListen;