cleanup & fix build

sponge/src/main/java/me/lucko/luckperms/sponge/managers/SpongeUserManager.java

@@ -197,11 +197,12 @@ public class SpongeUserManager implements UserManager, LPSubjectCollection {
 
     @Override
     public CompletableFuture<Void> updateAllUsers() {
-        return CompletableFuture.supplyAsync(plugin::getOnlinePlayers, plugin.getScheduler().sync())
-                .thenAcceptAsync(players -> players.forEach(uuid -> {
-                    UUID internal = plugin.getUuidCache().getUUID(uuid);
-                    plugin.getStorage().loadUser(internal, "null").join();
-                }), plugin.getScheduler().async());
+        return CompletableFuture.runAsync(
+                () -> plugin.getOnlinePlayers()
+                        .map(u -> plugin.getUuidCache().getUUID(u))
+                        .forEach(u -> plugin.getStorage().loadUser(u, null).join()),
+                plugin.getScheduler().async()
+        );
     }
 
     /* ------------------------------------------

sponge/src/main/java/me/lucko/luckperms/sponge/migration/MigrationPermissionsEx.java

@@ -181,7 +181,7 @@ public class MigrationPermissionsEx extends SubCommand<Object> {
             }
 
             // Make a LuckPerms user for the one being migrated
-            plugin.getStorage().loadUser(uuid, "null").join();
+            plugin.getStorage().loadUser(uuid, null).join();
             User user = plugin.getUserManager().getIfLoaded(uuid);
             if (user.getEnduringNodes().size() <= 1) {
                 user.clearNodes(false);