👀 Views: 0 💬 Answers: 1 📅 Created: 2025-06-13

jackson spring-boot enum deserialization Java

I've looked through the documentation and I'm still confused about Could someone explain I've looked through the documentation and I'm still confused about I'm relatively new to this, so bear with me..... I'm experiencing a question with deserializing an Enum type using Jackson in my Spring Boot application. I have a custom Enum with specific string values, and I'm trying to deserialize a JSON string into this Enum. However, when I run the application, I'm getting an behavior: `com.fasterxml.jackson.databind.exc.InvalidFormatException: want to deserialize value of type 'com.example.MyEnum' from String "INVALID_VALUE": value not one of declared Enum instance names: [VALUE_ONE, VALUE_TWO]`. Here's my Enum definition: ```java public enum MyEnum { VALUE_ONE, VALUE_TWO; } ``` And here’s a snippet of the class where I'm using the Enum: ```java public class MyClass { private MyEnum myEnum; public MyEnum getMyEnum() { return myEnum; } public void setMyEnum(MyEnum myEnum) { this.myEnum = myEnum; } } ``` My JSON input looks like this: ```json { "myEnum": "INVALID_VALUE" } ``` I've tried adding a custom deserializer for the Enum, but it doesn't seem to work as expected. Here's what I implemented: ```java import com.fasterxml.jackson.core.JsonParser; import com.fasterxml.jackson.databind.DeserializationContext; import com.fasterxml.jackson.databind.JsonDeserializer; import java.io.IOException; public class MyEnumDeserializer extends JsonDeserializer<MyEnum> { @Override public MyEnum deserialize(JsonParser p, DeserializationContext ctxt) throws IOException { String value = p.getText(); switch (value) { case "VALUE_ONE": return MyEnum.VALUE_ONE; case "VALUE_TWO": return MyEnum.VALUE_TWO; default: throw new IllegalArgumentException("Invalid value: " + value); } } } ``` And I've registered the deserializer in my configuration: ```java import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.module.SimpleModule; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public class JacksonConfig { @Bean public ObjectMapper objectMapper() { SimpleModule module = new SimpleModule(); module.addDeserializer(MyEnum.class, new MyEnumDeserializer()); ObjectMapper mapper = new ObjectMapper(); mapper.registerModule(module); return mapper; } } ``` Despite these attempts, I’m still working with the same scenario when the input contains an invalid value. How can I effectively handle this situation and provide a more user-friendly behavior message instead of the default Jackson behavior? Any insights would be greatly appreciated! For context: I'm using Java on macOS. I'm working on a microservice that needs to handle this. How would you solve this? Could someone point me to the right documentation?