使用 Jackson 库的 Bukkit ItemStack 序列化

Question

I'm trying to serialize and deserialize an ItemStack using the Jackson JSON library. So far I have managed to serialize the ItemStack however when I go to deserialize it, I get the following error:

com.fasterxml.jackson.databind.JsonMappingException: Can not find a (Map) Key deserializer for type [simple type, class org.bukkit.enchantments.Enchantment]

I'm not sure why this is. I have tried different versions of the Jackson library to no avail, I still get the exact same error. I have tried serializing ItemStacks with and without enchantments and I still get it. Any help would be appreciated here.

I am using the below code to deserialize my ItemStack:

try {
    ItemStack item = objectMapper.readValue(gang.getVaultItems().get(slot), ItemStack.class);
} catch (IOException ex) {
    ex.printStackTrace();
}

Answer 1

You're going to likely have to use custom deserialization for this. You can read more about it here . It is worth noting that by default Bukkit uses a fairly custom YAML implementation to handle serialization and deserialization. Look into ConfigurationSerializable if you're not familiar.