Minor - compile this code
- give yourself some cobblestone
- execute the function
- click on the recipe
- shift click on pickaxe (result)
- you can see an error in console
- close inventory and see the cobblestone back in inventory + pickaxe
Code:
void openTestTradeMachine(Player player)
{
Merchant merchant = Bukkit.createMerchant("Test trade machine");
List<MerchantRecipe> merchantRecipes = new ArrayList<>();
ItemStack result = new ItemStack(Material.DIAMOND_PICKAXE);
MerchantRecipe recipe = new MerchantRecipe(result, 10);
recipe.setExperienceReward(false);
ItemStack ingredient1 = new ItemStack(Material.COBBLESTONE);
ingredient1.setAmount(12);
recipe.addIngredient(ingredient1);
merchantRecipes.add(recipe);
merchant.setRecipes(merchantRecipes);
player.openMerchant(merchant, true);
}
Error:
[12:29:21] [Server thread/FATAL]: Error executing task on Server java.lang.ClassCastException: org.bukkit.craftbukkit.v1_14_R1.inventory.CraftMerchantCustom$MinecraftMerchant cannot be cast to net.minecraft.server.v1_14_R1.Entity at net.minecraft.server.v1_14_R1.ContainerMerchant.j(ContainerMerchant.java:116) ~[spigot-1.14.2.jar:git-Spigot-baafee9-043d31d] at net.minecraft.server.v1_14_R1.ContainerMerchant.shiftClick(ContainerMerchant.java:85) ~[spigot-1.14.2.jar:git-Spigot-baafee9-043d31d] at net.minecraft.server.v1_14_R1.Container.a(Container.java:311) ~[spigot-1.14.2.jar:git-Spigot-baafee9-043d31d] at net.minecraft.server.v1_14_R1.PlayerConnection.a(PlayerConnection.java:2170) ~[spigot-1.14.2.jar:git-Spigot-baafee9-043d31d] at net.minecraft.server.v1_14_R1.PacketPlayInWindowClick.a(SourceFile:33) ~[spigot-1.14.2.jar:git-Spigot-baafee9-043d31d] at net.minecraft.server.v1_14_R1.PacketPlayInWindowClick.a(SourceFile:10) ~[spigot-1.14.2.jar:git-Spigot-baafee9-043d31d] at net.minecraft.server.v1_14_R1.PlayerConnectionUtils.lambda$0(PlayerConnectionUtils.java:13) ~[spigot-1.14.2.jar:git-Spigot-baafee9-043d31d] at net.minecraft.server.v1_14_R1.TickTask.run(SourceFile:18) ~[spigot-1.14.2.jar:git-Spigot-baafee9-043d31d] at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeTask(SourceFile:135) [spigot-1.14.2.jar:git-Spigot-baafee9-043d31d] at net.minecraft.server.v1_14_R1.IAsyncTaskHandlerReentrant.executeTask(SourceFile:23) [spigot-1.14.2.jar:git-Spigot-baafee9-043d31d] at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeNext(SourceFile:114) [spigot-1.14.2.jar:git-Spigot-baafee9-043d31d] at net.minecraft.server.v1_14_R1.MinecraftServer.aW(MinecraftServer.java:895) [spigot-1.14.2.jar:git-Spigot-baafee9-043d31d] at net.minecraft.server.v1_14_R1.MinecraftServer.executeNext(MinecraftServer.java:888) [spigot-1.14.2.jar:git-Spigot-baafee9-043d31d] at net.minecraft.server.v1_14_R1.IAsyncTaskHandler.executeAll(SourceFile:99) [spigot-1.14.2.jar:git-Spigot-baafee9-043d31d] at net.minecraft.server.v1_14_R1.MinecraftServer.sleepForTick(MinecraftServer.java:871) [spigot-1.14.2.jar:git-Spigot-baafee9-043d31d] at net.minecraft.server.v1_14_R1.MinecraftServer.run(MinecraftServer.java:805) [spigot-1.14.2.jar:git-Spigot-baafee9-043d31d] at java.lang.Thread.run(Unknown Source) [?:1.8.0_161]