Fix failure callback order.

src/de/steamwar/bungeecore/Subserver.java

@@ -170,17 +170,18 @@ public class Subserver {
                 started = test.test(line);
             }
 
-            if(line == null){
-                failureCallback.accept(new IOException(serverName + " did not start correctly!"));
-                started = false;
-            }
+            if(line == null)
+                throw new IOException(serverName + " did not start correctly!");
         }
     }
 
     protected void register() {
         synchronized (serverList) {
             if(ProxyServer.getInstance().getServers().containsKey(serverName)) {
-                throw new SecurityException("Server already registered: " + serverName);
+                SecurityException e = new SecurityException("Server already registered: " + serverName);
+                stop();
+                failureCallback.accept(e);
+                throw e;
             }
 
             ProxyServer.getInstance().getServers().put(serverName, server);
@@ -212,7 +213,7 @@ public class Subserver {
                         sendProgress(4);
                     else if(line.contains("Preparing start region"))
                         sendProgress(6);
-                    return line.contains("Done (");
+                    return line.contains("Finished mapping loading");
                 });
             }