From c120fa6a4d63e144b4e7c35d767a0131ca957ab9 Mon Sep 17 00:00:00 2001
From: Luck <git@lucko.me>
Date: Sat, 16 May 2020 11:52:51 +0100
Subject: [PATCH] Fix startup on Nukkit (#2290)

---
 .../permissible/DummyPermissibleBase.java     |  2 +-
 .../common/util/EmptyCollections.java         | 25 +++++++++++++++++++
 .../permissible/DummyPermissibleBase.java     |  4 +--
 3 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/bukkit/src/main/java/me/lucko/luckperms/bukkit/inject/permissible/DummyPermissibleBase.java b/bukkit/src/main/java/me/lucko/luckperms/bukkit/inject/permissible/DummyPermissibleBase.java
index c12682763..ae76882c1 100644
--- a/bukkit/src/main/java/me/lucko/luckperms/bukkit/inject/permissible/DummyPermissibleBase.java
+++ b/bukkit/src/main/java/me/lucko/luckperms/bukkit/inject/permissible/DummyPermissibleBase.java
@@ -71,7 +71,7 @@ public class DummyPermissibleBase extends PermissibleBase {
         try {
             ATTACHMENTS_FIELD.set(this, EmptyCollections.list());
             PERMISSIONS_FIELD.set(this, EmptyCollections.map());
-        } catch (ReflectiveOperationException e) {
+        } catch (Exception e) {
             e.printStackTrace();
         }
     }
diff --git a/common/src/main/java/me/lucko/luckperms/common/util/EmptyCollections.java b/common/src/main/java/me/lucko/luckperms/common/util/EmptyCollections.java
index 370b761a8..94a77982a 100644
--- a/common/src/main/java/me/lucko/luckperms/common/util/EmptyCollections.java
+++ b/common/src/main/java/me/lucko/luckperms/common/util/EmptyCollections.java
@@ -27,7 +27,9 @@ package me.lucko.luckperms.common.util;
 
 import java.util.AbstractList;
 import java.util.AbstractMap;
+import java.util.AbstractSet;
 import java.util.Collections;
+import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
@@ -39,6 +41,7 @@ public final class EmptyCollections {
     private EmptyCollections() {}
 
     private static final EmptyList<?> LIST = new EmptyList<>();
+    private static final EmptySet<?> SET = new EmptySet<>();
     private static final EmptyMap<?, ?> MAP = new EmptyMap<>();
 
     @SuppressWarnings("unchecked")
@@ -46,6 +49,11 @@ public final class EmptyCollections {
         return (List<E>) LIST;
     }
 
+    @SuppressWarnings("unchecked")
+    public static <E> Set<E> set() {
+        return (Set<E>) SET;
+    }
+
     @SuppressWarnings("unchecked")
     public static <K, V> Map<K, V> map() {
         return (Map<K, V>) MAP;
@@ -78,6 +86,23 @@ public final class EmptyCollections {
         }
     }
 
+    private static final class EmptySet<E> extends AbstractSet<E> {
+        @Override
+        public Iterator<E> iterator() {
+            return Collections.emptyIterator();
+        }
+
+        @Override
+        public int size() {
+            return 0;
+        }
+
+        @Override
+        public boolean add(E e) {
+            return true;
+        }
+    }
+
     private static final class EmptyMap<K, V> extends AbstractMap<K, V> {
         @Override
         public Set<Entry<K, V>> entrySet() {
diff --git a/nukkit/src/main/java/me/lucko/luckperms/nukkit/inject/permissible/DummyPermissibleBase.java b/nukkit/src/main/java/me/lucko/luckperms/nukkit/inject/permissible/DummyPermissibleBase.java
index e219ccc55..8257c371a 100644
--- a/nukkit/src/main/java/me/lucko/luckperms/nukkit/inject/permissible/DummyPermissibleBase.java
+++ b/nukkit/src/main/java/me/lucko/luckperms/nukkit/inject/permissible/DummyPermissibleBase.java
@@ -68,9 +68,9 @@ public class DummyPermissibleBase extends PermissibleBase {
         super(null);
 
         try {
-            ATTACHMENTS_FIELD.set(this, EmptyCollections.list());
+            ATTACHMENTS_FIELD.set(this, EmptyCollections.set());
             PERMISSIONS_FIELD.set(this, EmptyCollections.map());
-        } catch (ReflectiveOperationException e) {
+        } catch (Exception e) {
             e.printStackTrace();
         }
     }