Fix migration commands never being executed

bukkit/src/main/resources/plugin.yml

@@ -12,10 +12,6 @@ load: STARTUP
 # when they check for the presence of a service provider, before LuckPerms has enabled.
 loadbefore: [Vault]
 
-# These are all soft dependencies for the migration feature. We check to see if these plugins are enabled
-# when setting up LuckPerms commands. That way, commands only appear if the corresponding plugin is loaded.
-softdepend: [PermissionsEx, GroupManager, PowerfulPerms, zPermissions, bPermissions]
-
 commands:
   luckperms:
     description: Manage permissions

common/src/main/java/me/lucko/luckperms/common/commands/MainCommand.java

@@ -23,7 +23,6 @@
 package me.lucko.luckperms.common.commands;
 
 import lombok.Getter;
-import lombok.NonNull;
 import me.lucko.luckperms.common.LuckPermsPlugin;
 import me.lucko.luckperms.common.commands.sender.Sender;
 import me.lucko.luckperms.common.commands.utils.Util;
@@ -42,7 +41,7 @@ public abstract class MainCommand<T> extends BaseCommand<Void, T> {
     private final String usage;
     private final int minArgs; // equals 1 if the command doesn't take a mid argument, e.g. /lp user <USER> sub-command....
 
-    public MainCommand(String name, String description, String usage, int minArgs, @NonNull List<Command<T, ?>> children) {
+    public MainCommand(String name, String description, String usage, int minArgs, List<Command<T, ?>> children) {
         super(name, description, null, Predicates.alwaysFalse(), null, children);
         this.usage = usage;
         this.minArgs = minArgs;
@@ -85,7 +84,6 @@ public abstract class MainCommand<T> extends BaseCommand<Void, T> {
         T t = getTarget(name, plugin, sender);
         if (t != null) {
             CommandResult result;
-
             try {
                 result = sub.execute(plugin, sender, t, strippedArgs, label);
             } catch (CommandException e) {

common/src/main/java/me/lucko/luckperms/common/commands/migration/MigrationMainCommand.java

@@ -22,7 +22,6 @@
 
 package me.lucko.luckperms.common.commands.migration;
 
-import com.google.common.collect.ImmutableList;
 import me.lucko.luckperms.common.LuckPermsPlugin;
 import me.lucko.luckperms.common.commands.*;
 import me.lucko.luckperms.common.commands.sender.Sender;
@@ -32,13 +31,17 @@ import me.lucko.luckperms.common.constants.Message;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
+import java.util.Optional;
 import java.util.stream.Collectors;
 
 public class MigrationMainCommand extends MainCommand<Object> {
+    private List<Command<Object, ?>> commands = null;
+
     public MigrationMainCommand() {
-        super("Migration", "Migration commands", "/%s migration", 1, ImmutableList.copyOf(getAvailableCommands()));
+        super("Migration", "Migration commands", "/%s migration", 1, null);
     }
 
+    @SuppressWarnings("unchecked")
     private static List<Command<Object, ?>> getAvailableCommands() {
         List<SubCommand<Object>> l = new ArrayList<>();
 
@@ -85,6 +88,22 @@ public class MigrationMainCommand extends MainCommand<Object> {
         return l.stream().collect(Collectors.toList());
     }
 
+    @SuppressWarnings("deprecation")
+    @Deprecated
+    @Override
+    public synchronized Optional<List<Command<Object, ?>>> getChildren() {
+        if (commands == null) {
+            commands = getAvailableCommands();
+        }
+
+        return Optional.of(commands);
+    }
+
+    @SuppressWarnings("deprecation")
+    public List<Command<Object, ?>> getSubCommands() {
+        return getChildren().orElse(null);
+    }
+
     @Override
     public boolean isAuthorized(Sender sender) {
         return sender.getUuid().equals(Constants.getConsoleUUID());
@@ -106,8 +125,8 @@ public class MigrationMainCommand extends MainCommand<Object> {
     }
 
     @Override
-    protected Void getTarget(String target, LuckPermsPlugin plugin, Sender sender) {
+    protected Object getTarget(String target, LuckPermsPlugin plugin, Sender sender) {
-        return null;
+        return new Object();
     }
 
     @Override