From 7e783e91153c239146ee984badea0c033ea615a2 Mon Sep 17 00:00:00 2001
From: Zach Brown <zach.brown@destroystokyo.com>
Date: Sat, 22 Sep 2018 15:56:59 -0400
Subject: [PATCH] Catch JsonParseException in Entity and TE names

As a result, data that no longer parses correctly will not crash the server
instead just logging the exception and continuing (and in most cases should
fix the data)

Player data is fixed pretty much immediately but some block data (like
Shulkers) may need to be changed in order for it to re-save properly

No more crashing though.

diff --git a/src/main/java/net/minecraft/server/CommandBlockListenerAbstract.java b/src/main/java/net/minecraft/server/CommandBlockListenerAbstract.java
index 7867122974..ef2a496eda 100644
--- a/src/main/java/net/minecraft/server/CommandBlockListenerAbstract.java
+++ b/src/main/java/net/minecraft/server/CommandBlockListenerAbstract.java
@@ -59,7 +59,7 @@ public abstract class CommandBlockListenerAbstract implements ICommandListener {
         this.command = nbttagcompound.getString("Command");
         this.successCount = nbttagcompound.getInt("SuccessCount");
         if (nbttagcompound.hasKeyOfType("CustomName", 8)) {
-            this.setName(IChatBaseComponent.ChatSerializer.a(nbttagcompound.getString("CustomName")));
+            this.setName(MCUtil.getBaseComponentFromNbt("CustomName", nbttagcompound)); // Paper - Catch ParseException
         }
 
         if (nbttagcompound.hasKeyOfType("TrackOutput", 1)) {
diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index fd78f647eb..1e3e541c8b 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -1679,7 +1679,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
                     this.Z();
                     this.setYawPitch(this.yaw, this.pitch);
                     if (nbttagcompound.hasKeyOfType("CustomName", 8)) {
-                        this.setCustomName(IChatBaseComponent.ChatSerializer.a(nbttagcompound.getString("CustomName")));
+                        this.setCustomName(MCUtil.getBaseComponentFromNbt("CustomName", nbttagcompound)); // Paper - Catch ParseException
                     }
 
                     this.setCustomNameVisible(nbttagcompound.getBoolean("CustomNameVisible"));
diff --git a/src/main/java/net/minecraft/server/MCUtil.java b/src/main/java/net/minecraft/server/MCUtil.java
index ddd7277162..bfddeb7cdb 100644
--- a/src/main/java/net/minecraft/server/MCUtil.java
+++ b/src/main/java/net/minecraft/server/MCUtil.java
@@ -407,4 +407,19 @@ public final class MCUtil {
                 return null;
         }
     }
+
+    @Nullable
+    public static IChatBaseComponent getBaseComponentFromNbt(String key, NBTTagCompound compound) {
+        if (!compound.hasKey(key)) {
+            return null;
+        }
+        String string = compound.getString(key);
+        try {
+            return IChatBaseComponent.ChatSerializer.jsonToComponent(string);
+        } catch (com.google.gson.JsonParseException e) {
+            org.bukkit.Bukkit.getLogger().warning("Unable to parse " + key + " from " + compound +": " + e.getMessage());
+        }
+
+        return null;
+    }
 }
diff --git a/src/main/java/net/minecraft/server/TileEntityBanner.java b/src/main/java/net/minecraft/server/TileEntityBanner.java
index 93911a8251..d35604edb2 100644
--- a/src/main/java/net/minecraft/server/TileEntityBanner.java
+++ b/src/main/java/net/minecraft/server/TileEntityBanner.java
@@ -60,7 +60,7 @@ public class TileEntityBanner extends TileEntity implements INamableTileEntity {
     public void load(NBTTagCompound nbttagcompound) {
         super.load(nbttagcompound);
         if (nbttagcompound.hasKeyOfType("CustomName", 8)) {
-            this.a = IChatBaseComponent.ChatSerializer.a(nbttagcompound.getString("CustomName"));
+            this.a = MCUtil.getBaseComponentFromNbt("CustomName", nbttagcompound); // Paper - Catch ParseException
         }
 
         if (this.hasWorld()) {
diff --git a/src/main/java/net/minecraft/server/TileEntityContainer.java b/src/main/java/net/minecraft/server/TileEntityContainer.java
index 473ec2cbde..ab6b86e4e9 100644
--- a/src/main/java/net/minecraft/server/TileEntityContainer.java
+++ b/src/main/java/net/minecraft/server/TileEntityContainer.java
@@ -17,7 +17,7 @@ public abstract class TileEntityContainer extends TileEntity implements IInvento
         super.load(nbttagcompound);
         this.chestLock = ChestLock.b(nbttagcompound);
         if (nbttagcompound.hasKeyOfType("CustomName", 8)) {
-            this.customName = IChatBaseComponent.ChatSerializer.a(nbttagcompound.getString("CustomName"));
+            this.customName = MCUtil.getBaseComponentFromNbt("CustomName", nbttagcompound); // Paper - Catch ParseException
         }
 
     }
-- 
2.25.1