Fix CraftPersistentDataTypeRegistry CME

patches/server/0920-Fix-CraftPersistentDataTypeRegistry-CME.patch

@@ -0,0 +1,53 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Gero <gecam59@gmail.com>
+Date: Sat, 1 Oct 2022 19:43:27 +0200
+Subject: [PATCH] Fix CraftPersistentDataTypeRegistry CME
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/persistence/CraftPersistentDataTypeRegistry.java b/src/main/java/org/bukkit/craftbukkit/persistence/CraftPersistentDataTypeRegistry.java
+index 355c9f79fd3132848a00eacde951d1e1bfa92737..f39b6d8eae3533d2795036e863566f61ebce53ea 100644
+--- a/src/main/java/org/bukkit/craftbukkit/persistence/CraftPersistentDataTypeRegistry.java
++++ b/src/main/java/org/bukkit/craftbukkit/persistence/CraftPersistentDataTypeRegistry.java
+@@ -93,6 +93,15 @@ public final class CraftPersistentDataTypeRegistry {
+     }
+
+     private final Map<Class, TagAdapter> adapters = new HashMap<>();
++    // Paper start - Fix CME
++    private TagAdapter getAdapter(Class type) {
++        TagAdapter adapter = this.adapters.get(type);
++        if (adapter != null) return adapter;
++        synchronized (this.adapters) {
++            return this.adapters.computeIfAbsent(type, CREATE_ADAPTER);
++        }
++    }
++    // Paper end - Fix CME
+
+     /**
+      * Creates a suitable adapter instance for the primitive class type
+@@ -212,7 +221,7 @@ public final class CraftPersistentDataTypeRegistry {
+      * type was found
+      */
+     public <T> Tag wrap(Class<T> type, T value) {
+-        return this.adapters.computeIfAbsent(type, CREATE_ADAPTER).build(value);
++        return getAdapter(type).build(value); // Paper - Fix CME
+     }
+
+     /**
+@@ -228,7 +237,7 @@ public final class CraftPersistentDataTypeRegistry {
+      * type was found
+      */
+     public <T> boolean isInstanceOf(Class<T> type, Tag base) {
+-        return this.adapters.computeIfAbsent(type, CREATE_ADAPTER).isInstance(base);
++        return getAdapter(type).isInstance(base); // Paper - Fix CME
+     }
+
+     /**
+@@ -249,7 +258,7 @@ public final class CraftPersistentDataTypeRegistry {
+      * type was found
+      */
+     public <T> T extract(Class<T> type, Tag tag) throws ClassCastException, IllegalArgumentException {
+-        TagAdapter adapter = this.adapters.computeIfAbsent(type, CREATE_ADAPTER);
++        TagAdapter adapter = getAdapter(type); // Paper - Fix CME
+         if (!adapter.isInstance(tag)) {
+             throw new IllegalArgumentException(String.format("`The found tag instance cannot store %s as it is a %s", type.getSimpleName(), tag.getClass().getSimpleName()));
+         }