Used Compute if absent

BauSystem_Main/src/de/steamwar/bausystem/features/tracer/Trace.java

@@ -188,18 +188,17 @@ public class Trace {
      * @param playerTraceShowData The showData for modifying the rendering
      */
     protected void render(List<TNTPoint> records, Player player, PlayerTraceShowData playerTraceShowData) {
-        REntityServer entityServer = entityServerMap.get(player);
-        if (entityServer == null) {
-            entityServer = new REntityServer();
-            entityServer.addPlayer(player);
-            entityServer.setCallback((p, rEntity, entityAction) -> {
+        REntityServer entityServer = entityServerMap.computeIfAbsent(player, k -> {
+            REntityServer newEntityServer = new REntityServer();
+            newEntityServer.addPlayer(k);
+            newEntityServer.setCallback((p, rEntity, entityAction) -> {
                 if (entityAction != REntityServer.EntityAction.INTERACT) return;
                 if (rEntity instanceof TraceEntity) {
                     ((TraceEntity) rEntity).printIntoChat(p);
                 }
             });
-            entityServerMap.put(player, entityServer);
-        }
+            return newEntityServer;
+        });
 
         render(records, entityServer, playerTraceShowData);
     }