Question

I am trying to submit a form from Ext JS 4 to a Spring 3 Controller using JSON. I am using Jackson 1.9.8 for the serialization/deserialization using Spring’s built-in Jackson JSON support.

I have a status field that is initially null in the Domain object for a new record. When the form is submitted it generates the following json (scaled down to a few fields)

{"id":0,"name":"someName","status":""}

After submitted the following is seen in the server log

"nested exception is org.codehaus.jackson.map.JsonMappingException: Can not construct instance of com.blah.domain.StatusEnum from String value '': value not one of the declared Enum instance names"

So it appears that Jackson is expecting a valid Enum value or no value at all including an empty string. How do I fix this whether it is in Ext JS, Jackson or Spring?

I tried to create my own ObjectMapper such as

public class MyObjectMapper extends Object Mapper {
    public MyObjectMapper() {
        configure(DeserializationConfig.Feature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, true);
    }
}

and send this as a property to MappingJacksonMappingView but this didn’t work. I also tried sending it in to MappingJacksonHttpMessageConverter but that didn’t work. Side question: Which one should I be sending in my own ObjectMapper?

Suggestions?

Answer 1

Ended up adding defaults in the EXT JS Model so there is always a value. Was hoping that I didn’t have to this but it’s not that big of a deal.