Cleanup handling of unknown/null usernames for users

api/src/main/java/me/lucko/luckperms/api/Storage.java

@@ -93,13 +93,23 @@ public interface Storage {
      * Loads a user's data from the main storage into the plugins local storage.
      *
      * @param uuid     the uuid of the user to load
-     * @param username the users username. (if you want to specify <code>null</code> here, just input "null" as a
-     *                 string.)
+     * @param username the users username, or null if it is not known.
      * @return if the operation completed successfully
-     * @throws NullPointerException if uuid or username is null
+     * @throws NullPointerException if uuid is null
      */
     CompletableFuture<Boolean> loadUser(UUID uuid, String username);
 
+    /**
+     * Loads a user's data from the main storage into the plugins local storage.
+     *
+     * @param uuid the uuid of the user to load
+     * @return if the operation completed successfully
+     * @throws NullPointerException if uuid is null
+     */
+    default CompletableFuture<Boolean> loadUser(UUID uuid) {
+        return loadUser(uuid, null);
+    }
+
     /**
      * Saves a user object back to storage. You should call this after you make any changes to a user.
      *

api/src/main/java/me/lucko/luckperms/api/User.java

@@ -43,7 +43,7 @@ public interface User extends PermissionHolder {
     UUID getUuid();
 
     /**
-     * Gets the users username
+     * Gets the users username, or null if no username is associated with this user
      *
      * @return the Users Username
      */

bukkit/src/main/java/me/lucko/luckperms/bukkit/BukkitCalculatorFactory.java

@@ -69,6 +69,6 @@ public class BukkitCalculatorFactory extends AbstractCalculatorFactory {
         }
         processors.add(new DefaultsProcessor(contexts.isOp(), plugin.getDefaultsProvider()));
 
-        return registerCalculator(new PermissionCalculator(plugin, user.getName(), processors.build()));
+        return registerCalculator(new PermissionCalculator(plugin, user.getFriendlyName(), processors.build()));
     }
 }

bukkit/src/main/java/me/lucko/luckperms/bukkit/vault/VaultChatHook.java

@@ -124,7 +124,7 @@ public class VaultChatHook extends Chat {
         world = perms.isIgnoreWorld() ? null : world;
         node = escapeCharacters(node);
 
-        perms.log("Getting meta: '" + node + "' for user " + user.getName() + " on world " + world + ", server " + perms.getServer());
+        perms.log("Getting meta: '" + node + "' for user " + user.getFriendlyName() + " on world " + world + ", server " + perms.getServer());
 
         if (user.getUserData() == null) {
             return defaultValue;
@@ -142,7 +142,7 @@ public class VaultChatHook extends Chat {
         if (user == null) return "";
         world = perms.isIgnoreWorld() ? null : world;
 
-        perms.log("Getting " + (prefix ? "prefix" : "suffix") + " for user " + user.getName() + " on world " + world + ", server " + perms.getServer());
+        perms.log("Getting " + (prefix ? "prefix" : "suffix") + " for user " + user.getFriendlyName() + " on world " + world + ", server " + perms.getServer());
 
         if (user.getUserData() == null) {
             return "";

bungee/src/main/java/me/lucko/luckperms/bungee/BungeeCalculatorFactory.java

@@ -54,6 +54,6 @@ public class BungeeCalculatorFactory extends AbstractCalculatorFactory {
             processors.add(new WildcardProcessor());
         }
 
-        return registerCalculator(new PermissionCalculator(plugin, user.getName(), processors.build()));
+        return registerCalculator(new PermissionCalculator(plugin, user.getFriendlyName(), processors.build()));
     }
 }

common/src/main/java/me/lucko/luckperms/common/api/delegates/StorageDelegate.java

@@ -88,12 +88,12 @@ public class StorageDelegate implements Storage {
     }
 
     @Override
-    public CompletableFuture<Boolean> loadUser(UUID uuid, String username) {
-        return handle.force().loadUser(uuid, checkUsername(username));
+    public CompletableFuture<Boolean> loadUser(@NonNull UUID uuid, String username) {
+        return handle.force().loadUser(uuid, username == null ? null : checkUsername(username));
     }
 
     @Override
-    public CompletableFuture<Boolean> saveUser(User user) {
+    public CompletableFuture<Boolean> saveUser(@NonNull User user) {
         return handle.force().saveUser(UserDelegate.cast(user));
     }
 
@@ -113,12 +113,12 @@ public class StorageDelegate implements Storage {
     }
 
     @Override
-    public CompletableFuture<Boolean> createAndLoadGroup(String name) {
+    public CompletableFuture<Boolean> createAndLoadGroup(@NonNull String name) {
         return handle.force().createAndLoadGroup(checkName(name), CreationCause.API);
     }
 
     @Override
-    public CompletableFuture<Boolean> loadGroup(String name) {
+    public CompletableFuture<Boolean> loadGroup(@NonNull String name) {
         return handle.force().loadGroup(checkName(name));
     }
 
@@ -128,12 +128,12 @@ public class StorageDelegate implements Storage {
     }
 
     @Override
-    public CompletableFuture<Boolean> saveGroup(Group group) {
+    public CompletableFuture<Boolean> saveGroup(@NonNull Group group) {
         return handle.force().saveGroup(GroupDelegate.cast(group));
     }
 
     @Override
-    public CompletableFuture<Boolean> deleteGroup(Group group) {
+    public CompletableFuture<Boolean> deleteGroup(@NonNull Group group) {
         if (group.getName().equalsIgnoreCase(plugin.getConfiguration().get(ConfigKeys.DEFAULT_GROUP_NAME))) {
             throw new IllegalArgumentException("Cannot delete the default group.");
         }
@@ -146,12 +146,12 @@ public class StorageDelegate implements Storage {
     }
 
     @Override
-    public CompletableFuture<Boolean> createAndLoadTrack(String name) {
+    public CompletableFuture<Boolean> createAndLoadTrack(@NonNull String name) {
         return handle.force().createAndLoadTrack(checkName(name), CreationCause.API);
     }
 
     @Override
-    public CompletableFuture<Boolean> loadTrack(String name) {
+    public CompletableFuture<Boolean> loadTrack(@NonNull String name) {
         return handle.force().loadTrack(checkName(name));
     }
 
@@ -161,22 +161,22 @@ public class StorageDelegate implements Storage {
     }
 
     @Override
-    public CompletableFuture<Boolean> saveTrack(Track track) {
+    public CompletableFuture<Boolean> saveTrack(@NonNull Track track) {
         return handle.force().saveTrack(TrackDelegate.cast(track));
     }
 
     @Override
-    public CompletableFuture<Boolean> deleteTrack(Track track) {
+    public CompletableFuture<Boolean> deleteTrack(@NonNull Track track) {
         return handle.force().deleteTrack(TrackDelegate.cast(track), DeletionCause.API);
     }
 
     @Override
-    public CompletableFuture<Boolean> saveUUIDData(String username, UUID uuid) {
+    public CompletableFuture<Boolean> saveUUIDData(@NonNull String username, @NonNull UUID uuid) {
         return handle.force().saveUUIDData(checkUsername(username), uuid);
     }
 
     @Override
-    public CompletableFuture<UUID> getUUID(String username) {
+    public CompletableFuture<UUID> getUUID(@NonNull String username) {
         return handle.force().getUUID(checkUsername(username));
     }
 

common/src/main/java/me/lucko/luckperms/common/api/delegates/UserDelegate.java

@@ -49,9 +49,9 @@ import static me.lucko.luckperms.common.api.ApiUtils.checkTime;
  * Provides a link between {@link User} and {@link me.lucko.luckperms.common.core.model.User}
  */
 public final class UserDelegate extends PermissionHolderDelegate implements User {
-    public static me.lucko.luckperms.common.core.model.User cast(User g) {
-        Preconditions.checkState(g instanceof UserDelegate, "Illegal instance " + g.getClass() + " cannot be handled by this implementation.");
-        return ((UserDelegate) g).getHandle();
+    public static me.lucko.luckperms.common.core.model.User cast(User u) {
+        Preconditions.checkState(u instanceof UserDelegate, "Illegal instance " + u.getClass() + " cannot be handled by this implementation.");
+        return ((UserDelegate) u).getHandle();
     }
 
     @Getter
@@ -69,7 +69,7 @@ public final class UserDelegate extends PermissionHolderDelegate implements User
 
     @Override
     public String getName() {
-        return handle.getName();
+        return handle.getName().orElse(null);
     }
 
     @Override

common/src/main/java/me/lucko/luckperms/common/commands/impl/misc/CheckCommand.java

@@ -73,12 +73,12 @@ public class CheckCommand extends SingleCommand {
 
         UserCache data = user.getUserData();
         if (data == null) {
-            Message.USER_NO_DATA.send(sender, user.getName());
+            Message.USER_NO_DATA.send(sender, user.getFriendlyName());
             return CommandResult.STATE_ERROR;
         }
 
         Tristate tristate = data.getPermissionData(plugin.getContextForUser(user)).getPermissionValue(permission);
-        Message.CHECK_RESULT.send(sender, user.getName(), permission, Util.formatTristate(tristate));
+        Message.CHECK_RESULT.send(sender, user.getFriendlyName(), permission, Util.formatTristate(tristate));
         return CommandResult.SUCCESS;
     }
 }

common/src/main/java/me/lucko/luckperms/common/commands/impl/misc/TreeCommand.java

@@ -92,7 +92,7 @@ public class TreeCommand extends SingleCommand {
 
             UserCache data = user.getUserData();
             if (data == null) {
-                Message.USER_NO_DATA.send(sender, user.getName());
+                Message.USER_NO_DATA.send(sender, user.getFriendlyName());
                 return CommandResult.STATE_ERROR;
             }
 
@@ -106,7 +106,7 @@ public class TreeCommand extends SingleCommand {
 
             Message.TREE_UPLOAD_START.send(sender);
 
-            String url = view.uploadPasteData(plugin.getVersion(), user.getName(), permissionData);
+            String url = view.uploadPasteData(plugin.getVersion(), user.getFriendlyName(), permissionData);
             if (url == null) {
                 url = "null";
             }

common/src/main/java/me/lucko/luckperms/common/commands/impl/user/UserDemote.java

@@ -125,7 +125,7 @@ public class UserDemote extends SubCommand<User> {
 
             user.unsetPermission(oldNode);
 
-            Message.USER_DEMOTE_ENDOFTRACK.send(sender, track.getName(), user.getName(), old);
+            Message.USER_DEMOTE_ENDOFTRACK.send(sender, track.getName(), user.getFriendlyName(), old);
 
             LogEntry.build().actor(sender).acted(user)
                     .action("demote " + args.stream().collect(Collectors.joining(" ")))

common/src/main/java/me/lucko/luckperms/common/commands/impl/user/UserInfo.java

@@ -54,7 +54,7 @@ public class UserInfo extends SubCommand<User> {
     @Override
     public CommandResult execute(LuckPermsPlugin plugin, Sender sender, User user, List<String> args, String label) throws CommandException {
         Message.USER_INFO_GENERAL.send(sender,
-                user.getName(),
+                user.getName().orElse("Unknown"),
                 user.getUuid(),
                 plugin.getPlayerStatus(user.getUuid()),
                 user.getPrimaryGroup().getValue(),

common/src/main/java/me/lucko/luckperms/common/commands/impl/user/UserPromote.java

@@ -106,13 +106,13 @@ public class UserPromote extends SubCommand<User> {
 
             Group nextGroup = plugin.getGroupManager().getIfLoaded(first);
             if (nextGroup == null) {
-                Message.USER_PROMOTE_ERROR_MALFORMED.send(sender, false);
+                Message.USER_PROMOTE_ERROR_MALFORMED.send(sender, first);
                 return CommandResult.LOADING_ERROR;
             }
 
             user.setPermission(NodeFactory.newBuilder("group." + first).withExtraContext(context).build());
 
-            Message.USER_TRACK_ADDED_TO_FIRST.send(sender, user.getName(), first, Util.contextSetToString(context));
+            Message.USER_TRACK_ADDED_TO_FIRST.send(sender, user.getFriendlyName(), first, Util.contextSetToString(context));
             LogEntry.build().actor(sender).acted(user)
                     .action("promote " + args.stream().collect(Collectors.joining(" ")))
                     .build().submit(plugin, sender);

common/src/main/java/me/lucko/luckperms/common/commands/impl/user/UserSwitchPrimaryGroup.java

@@ -68,12 +68,12 @@ public class UserSwitchPrimaryGroup extends SubCommand<User> {
         }
 
         if (!user.inheritsGroup(group)) {
-            Message.USER_PRIMARYGROUP_ERROR_NOTMEMBER.send(sender, user.getName(), group.getName());
+            Message.USER_PRIMARYGROUP_ERROR_NOTMEMBER.send(sender, user.getFriendlyName(), group.getName());
             user.setInheritGroup(group, ContextSet.empty());
         }
 
         user.getPrimaryGroup().setStoredValue(group.getName());
-        Message.USER_PRIMARYGROUP_SUCCESS.send(sender, user.getName(), group.getDisplayName());
+        Message.USER_PRIMARYGROUP_SUCCESS.send(sender, user.getFriendlyName(), group.getDisplayName());
         LogEntry.build().actor(sender).acted(user)
                 .action("setprimarygroup " + group.getName())
                 .build().submit(plugin, sender);

common/src/main/java/me/lucko/luckperms/common/core/UserIdentifier.java

@@ -33,20 +33,29 @@ import lombok.ToString;
 
 import me.lucko.luckperms.common.utils.Identifiable;
 
+import java.util.Optional;
 import java.util.UUID;
 
-@Getter
 @ToString
 @EqualsAndHashCode(of = "uuid")
 @AllArgsConstructor(access = AccessLevel.PRIVATE)
 public final class UserIdentifier implements Identifiable<UUID> {
     public static UserIdentifier of(UUID uuid, String username) {
+        if (username == null || username.equalsIgnoreCase("null") || username.isEmpty()) {
+            username = null;
+        }
+
         return new UserIdentifier(uuid, username);
     }
 
+    @Getter
     private final UUID uuid;
     private final String username;
 
+    public Optional<String> getUsername() {
+        return Optional.ofNullable(username);
+    }
+
     @Override
     public UUID getId() {
         return getUuid();

common/src/main/java/me/lucko/luckperms/common/core/model/User.java

@@ -27,7 +27,6 @@ package me.lucko.luckperms.common.core.model;
 
 import lombok.EqualsAndHashCode;
 import lombok.Getter;
-import lombok.Setter;
 import lombok.ToString;
 
 import me.lucko.luckperms.api.caching.UserData;
@@ -42,6 +41,7 @@ import me.lucko.luckperms.common.primarygroup.PrimaryGroupHolder;
 import me.lucko.luckperms.common.utils.BufferedRequest;
 import me.lucko.luckperms.common.utils.Identifiable;
 
+import java.util.Optional;
 import java.util.UUID;
 
 @ToString(of = {"uuid"})
@@ -57,9 +57,7 @@ public class User extends PermissionHolder implements Identifiable<UserIdentifie
     /**
      * The last known username of a player
      */
-    @Getter
-    @Setter
-    private String name;
+    private String name = null;
 
     /**
      * The users primary group
@@ -88,14 +86,14 @@ public class User extends PermissionHolder implements Identifiable<UserIdentifie
     public User(UUID uuid, LuckPermsPlugin plugin) {
         super(uuid.toString(), plugin);
         this.uuid = uuid;
-        this.name = null;
         this.primaryGroup = plugin.getConfiguration().get(ConfigKeys.PRIMARY_GROUP_CALCULATION).apply(this);
     }
 
     public User(UUID uuid, String name, LuckPermsPlugin plugin) {
         super(uuid.toString(), plugin);
         this.uuid = uuid;
-        this.name = name;
+        setName(name, true);
+
         this.primaryGroup = plugin.getConfiguration().get(ConfigKeys.PRIMARY_GROUP_CALCULATION).apply(this);
     }
 
@@ -104,9 +102,49 @@ public class User extends PermissionHolder implements Identifiable<UserIdentifie
         return UserIdentifier.of(uuid, name);
     }
 
+    public Optional<String> getName() {
+        return Optional.ofNullable(name);
+    }
+
+    public boolean setName(String name, boolean force) {
+        // if the value being set is null
+        if (name == null || name.equalsIgnoreCase("null") || name.isEmpty()) {
+            // only apply the change if it is being forced
+            if (force) {
+                // if the name is already null, return false
+                if (this.name == null) {
+                    return false;
+                } else {
+                    // set the new null value
+                    this.name = null;
+                    return true;
+                }
+            } else {
+                // we already have a non-null value, so return false
+                return false;
+            }
+        } else {
+            // the name being set is not null
+            if (this.name == null) {
+                this.name = name;
+                return true;
+            }
+
+            // update the capitalisation, but still return false
+            if (this.name.equalsIgnoreCase(name)) {
+                this.name = name;
+                return false;
+            }
+
+            // completely new value, just set & return true
+            this.name = name;
+            return true;
+        }
+    }
+
     @Override
     public String getFriendlyName() {
-        return name;
+        return name != null ? name : uuid.toString();
     }
 
     @Override

common/src/main/java/me/lucko/luckperms/common/data/Exporter.java

@@ -217,7 +217,7 @@ public class Exporter implements Runnable {
 
                             plugin.getStorage().loadUser(uuid, "null").join();
                             User user = plugin.getUserManager().get(uuid);
-                            output.add("# Export user: " + user.getUuid().toString() + " - " + user.getName());
+                            output.add("# Export user: " + user.getUuid().toString() + " - " + user.getName().orElse("unknown username"));
 
                             boolean inDefault = false;
                             for (Node node : user.getNodes().values()) {

common/src/main/java/me/lucko/luckperms/common/data/LogEntry.java

@@ -116,7 +116,7 @@ public class LogEntry extends me.lucko.luckperms.api.LogEntry {
 
         public LogEntryBuilder acted(PermissionHolder acted) {
             if (acted instanceof User) {
-                super.actedName(((User) acted).getName());
+                super.actedName(((User) acted).getName().orElse("null"));
                 super.acted(((User) acted).getUuid());
                 super.type('U');
             } else if (acted instanceof Group) {

common/src/main/java/me/lucko/luckperms/common/managers/impl/GenericUserManager.java

@@ -35,6 +35,7 @@ import me.lucko.luckperms.common.managers.AbstractManager;
 import me.lucko.luckperms.common.managers.UserManager;
 import me.lucko.luckperms.common.plugin.LuckPermsPlugin;
 
+import java.util.Optional;
 import java.util.Set;
 import java.util.UUID;
 
@@ -105,15 +106,16 @@ public class GenericUserManager extends AbstractManager<UserIdentifier, User> im
 
     @Override
     public User apply(UserIdentifier id) {
-        return id.getUsername() == null ?
+        return !id.getUsername().isPresent() ?
                 new User(id.getUuid(), plugin) :
-                new User(id.getUuid(), id.getUsername(), plugin);
+                new User(id.getUuid(), id.getUsername().get(), plugin);
     }
 
     @Override
     public User getByUsername(String name) {
         for (User user : getAll().values()) {
-            if (user.getName().equalsIgnoreCase(name)) {
+            Optional<String> n = user.getName();
+            if (n.isPresent() && n.get().equalsIgnoreCase(name)) {
                 return user;
             }
         }

common/src/main/java/me/lucko/luckperms/common/storage/backing/FlatfileBacking.java

@@ -180,7 +180,7 @@ public abstract class FlatfileBacking extends AbstractBacking {
 
                 User u = plugin.getUserManager().get(uuid);
                 if (u != null) {
-                    plugin.getLog().info("[FileWatcher] Refreshing user " + u.getName());
+                    plugin.getLog().info("[FileWatcher] Refreshing user " + u.getFriendlyName());
                     plugin.getStorage().loadUser(uuid, "null");
                 }
             });

common/src/main/java/me/lucko/luckperms/common/storage/backing/JSONBacking.java

@@ -176,13 +176,9 @@ public class JSONBacking extends FlatfileBacking {
 
                     boolean save = plugin.getUserManager().giveDefaultIfNeeded(user, false);
 
-                    if (user.getName() == null || user.getName().equalsIgnoreCase("null")) {
-                        user.setName(name);
-                    } else {
-                        if (!name.equalsIgnoreCase(user.getName())) {
+                    if (user.setName(name, false)) {
                         save = true;
                     }
-                    }
 
                     if (save) {
                         saveUser(user);
@@ -230,7 +226,7 @@ public class JSONBacking extends FlatfileBacking {
 
                 JsonObject data = new JsonObject();
                 data.addProperty("uuid", user.getUuid().toString());
-                data.addProperty("name", user.getName());
+                data.addProperty("name", user.getName().orElse("null"));
                 data.addProperty("primaryGroup", user.getPrimaryGroup().getStoredValue());
 
                 Set<NodeModel> nodes = user.getNodes().values().stream().map(NodeModel::fromNode).collect(Collectors.toCollection(LinkedHashSet::new));

common/src/main/java/me/lucko/luckperms/common/storage/backing/MongoDBBacking.java

@@ -98,7 +98,7 @@ public class MongoDBBacking extends AbstractBacking {
 
     private static Document fromUser(User user) {
         Document main = new Document("_id", user.getUuid())
-                .append("name", user.getName())
+                .append("name", user.getName().orElse("null"))
                 .append("primaryGroup", user.getPrimaryGroup().getStoredValue());
 
         Document perms = new Document();
@@ -325,13 +325,9 @@ public class MongoDBBacking extends AbstractBacking {
 
                         boolean save = plugin.getUserManager().giveDefaultIfNeeded(user, false);
 
-                        if (user.getName() == null || user.getName().equalsIgnoreCase("null")) {
-                            user.setName(d.getString("name"));
-                        } else {
-                            if (!d.getString("name").equalsIgnoreCase(user.getName())) {
+                        if (user.setName(name, false)) {
                             save = true;
                         }
-                        }
 
                         if (save) {
                             c.replaceOne(new Document("_id", user.getUuid()), fromUser(user));

common/src/main/java/me/lucko/luckperms/common/storage/backing/SQLBacking.java

@@ -349,9 +349,7 @@ public class SQLBacking extends AbstractBacking {
             }
 
             // Update their username to what was in the storage if the one in the local instance is null
-            if (user.getName() == null || user.getName().equalsIgnoreCase("null")) {
-                user.setName(name);
-            }
+            user.setName(name, false);
 
             // If the user has any data in storage
             if (!data.isEmpty()) {

common/src/main/java/me/lucko/luckperms/common/storage/backing/YAMLBacking.java

@@ -179,13 +179,9 @@ public class YAMLBacking extends FlatfileBacking {
 
                     boolean save = plugin.getUserManager().giveDefaultIfNeeded(user, false);
 
-                    if (user.getName() == null || user.getName().equalsIgnoreCase("null")) {
-                        user.setName(name);
-                    } else {
-                        if (!name.equalsIgnoreCase(user.getName())) {
+                    if (user.setName(name, false)) {
                         save = true;
                     }
-                    }
 
                     if (save) {
                         saveUser(user);
@@ -231,7 +227,7 @@ public class YAMLBacking extends FlatfileBacking {
 
                 Map<String, Object> values = new LinkedHashMap<>();
                 values.put("uuid", user.getUuid().toString());
-                values.put("name", user.getName());
+                values.put("name", user.getName().orElse("null"));
                 values.put("primary-group", user.getPrimaryGroup().getStoredValue());
 
                 Set<NodeModel> data = user.getNodes().values().stream().map(NodeModel::fromNode).collect(Collectors.toCollection(LinkedHashSet::new));

common/src/main/java/me/lucko/luckperms/common/storage/wrappings/BufferedOutputStorage.java

@@ -76,7 +76,7 @@ public class BufferedOutputStorage implements Storage, Runnable {
     private final Buffer<UserIdentifier, Boolean> uuidDataOutputBuffer = new Buffer<UserIdentifier, Boolean>() {
         @Override
         protected Boolean dequeue(UserIdentifier userIdentifier) {
-            return backing.saveUUIDData(userIdentifier.getUsername(), userIdentifier.getUuid()).join();
+            return backing.saveUUIDData(userIdentifier.getUsername().get(), userIdentifier.getUuid()).join();
         }
     };
 

sponge/src/main/java/me/lucko/luckperms/sponge/SpongeCalculatorFactory.java

@@ -58,6 +58,6 @@ public class SpongeCalculatorFactory extends AbstractCalculatorFactory {
         }
         processors.add(new DefaultsProcessor(plugin.getService(), contexts.getContexts()));
 
-        return registerCalculator(new PermissionCalculator(plugin, user.getName(), processors.build()));
+        return registerCalculator(new PermissionCalculator(plugin, user.getFriendlyName(), processors.build()));
     }
 }

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

@@ -56,6 +56,7 @@ import co.aikar.timings.Timing;
 import java.util.Collection;
 import java.util.HashSet;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
 import java.util.UUID;
 import java.util.concurrent.TimeUnit;
@@ -115,9 +116,9 @@ public class SpongeUserManager implements UserManager, LPSubjectCollection {
 
     @Override
     public SpongeUser apply(UserIdentifier id) {
-        return id.getUsername() == null ?
+        return !id.getUsername().isPresent() ?
                 new SpongeUser(id.getUuid(), plugin) :
-                new SpongeUser(id.getUuid(), id.getUsername(), plugin);
+                new SpongeUser(id.getUuid(), id.getUsername().get(), plugin);
     }
 
     public void performCleanup() {
@@ -182,7 +183,8 @@ public class SpongeUserManager implements UserManager, LPSubjectCollection {
     @Override
     public SpongeUser getByUsername(String name) {
         for (SpongeUser user : getAll().values()) {
-            if (user.getName().equalsIgnoreCase(name)) {
+            Optional<String> n = user.getName();
+            if (n.isPresent() && n.get().equalsIgnoreCase(name)) {
                 return user;
             }
         }

sponge/src/main/java/me/lucko/luckperms/sponge/model/SpongeUser.java

@@ -98,7 +98,7 @@ public class SpongeUser extends User {
 
         private synchronized void checkData() {
             if (parent.getUserData() == null) {
-                plugin.getLog().warn("User " + parent.getName() + " - " + parent.getUuid() + " does not have any data loaded.");
+                plugin.getLog().warn("User " + parent.getName().orElse("unknown") + " - " + parent.getUuid() + " does not have any data loaded.");
                 parent.setupData(false);
             }
         }