Potential Fix for hidden Bauserver.

src/de/steamwar/bungeecore/Bauserver.java

@@ -38,21 +38,21 @@ public class Bauserver extends Subserver {
     private final UUID owner;
 
     public Bauserver(String serverName, UUID owner, int port, ProcessBuilder processBuilder, Runnable shutdownCallback){
-        super(Servertype.BAUSERVER, serverName, port, processBuilder, shutdownCallback, null);
+        this(serverName, owner, port, processBuilder, shutdownCallback, null);
-        this.owner = owner;
     }
 
     public Bauserver(String serverName, UUID owner, int port, ProcessBuilder processBuilder, Runnable shutdownCallback, Consumer<Exception> failureCallback){
         super(Servertype.BAUSERVER, serverName, port, processBuilder, shutdownCallback, failureCallback);
         this.owner = owner;
+
+        synchronized (servers) {
+            servers.put(owner, this);
+        }
     }
 
     @Override
     protected void register() {
         super.register();
-        synchronized (servers) {
-            servers.put(owner, this);
-        }
     }
 
     @Override

src/de/steamwar/bungeecore/Builderserver.java

@@ -37,21 +37,21 @@ public class Builderserver extends Subserver {
 
     private final String map;
     public Builderserver(String serverName, String map, int port, ProcessBuilder processBuilder, Runnable shutdownCallback){
-        super(Servertype.BUILDER, serverName, port, processBuilder, shutdownCallback, null);
+        this(serverName, map, port, processBuilder, shutdownCallback, null);
-        this.map = map;
     }
 
     public Builderserver(String serverName, String map, int port, ProcessBuilder processBuilder, Runnable shutdownCallback, Consumer<Exception> failureCallback){
         super(Servertype.BUILDER, serverName, port, processBuilder, shutdownCallback, failureCallback);
         this.map = map;
+
+        synchronized (servers) {
+            servers.put(map, this);
+        }
     }
 
     @Override
     protected void register() {
         super.register();
-        synchronized (servers) {
-            servers.put(map, this);
-        }
     }
 
     @Override

src/de/steamwar/bungeecore/Subserver.java

@@ -40,14 +40,11 @@ import java.util.logging.Level;
 import java.util.logging.Logger;
 
 public class Subserver {
-
-    @SuppressWarnings("deprecation")
-    private static final Map<String, ServerInfo> servers = ProxyServer.getInstance().getServers();
     private static final Logger logger = ProxyServer.getInstance().getLogger();
 
     @Getter
     private static final List<Subserver> serverList = new LinkedList<>();
-    private static final Map<String, Subserver> infoToServer = new HashMap<>();
+    private static final Map<ServerInfo, Subserver> infoToServer = new HashMap<>();
 
     public static Subserver getSubserver(ProxiedPlayer p) {
         synchronized (serverList) {
@@ -61,7 +58,7 @@ public class Subserver {
 
     public static Subserver getSubserver(ServerInfo server) {
         synchronized (serverList) {
-            return infoToServer.get(server.getName());
+            return infoToServer.get(server);
         }
     }
 
@@ -181,24 +178,29 @@ public class Subserver {
     }
 
     protected void register() {
-        servers.put(serverName, server);
         synchronized (serverList) {
+            if(ProxyServer.getInstance().getServers().containsKey(serverName)) {
+                throw new SecurityException("Server already registered: " + serverName);
+            }
+
+            ProxyServer.getInstance().getServers().put(serverName, server);
             serverList.add(this);
-            infoToServer.put(serverName, this);
+            infoToServer.put(server, this);
         }
     }
 
     protected void unregister() {
         synchronized (serverList){
-            infoToServer.remove(serverName);
+            infoToServer.remove(server);
             serverList.remove(this);
+            ProxyServer.getInstance().getServers().remove(serverName);
         }
-        servers.remove(serverName);
     }
 
     private void run() {
         register();
 
+        Exception ex = null;
         try {
             if(checkpoint) {
                 start(process.getErrorStream(), line -> line.contains("Restore finished successfully."));
@@ -229,13 +231,15 @@ public class Subserver {
 
             process.waitFor();
         } catch(IOException e) {
-            failureCallback.accept(e);
+            ex = e;
         } catch(InterruptedException e) {
-            failureCallback.accept(e);
+            ex = e;
             Thread.currentThread().interrupt();
         } finally {
-            shutdownCallback.run();
             unregister();
+            shutdownCallback.run();
+            if(ex != null)
+                failureCallback.accept(ex);
         }
     }