Question

I’m using Spring Roo on top of MySQL. I pull dates out via the Roo-generated JSON methods, make changes to that data in a browser form, and save it back via the Roo-generated JSON methods.

The date format I’m getting out is yyyy-MM-dd, standard MySQL date format. I’m using a calendaring widget on the browser to ensure the date I’m submitting is the same format.

Unfortunately my data doesn’t go right through the ...FromJson() method, failing with the error:

Parsing date 2007-12-12 was not recognized as a date format

I presume that the problem is that it’s coming out as a string, but JPA feels like it needs to generate a Date object to update.

I’ll happily show my code about this, but it’s nothing Roo didn’t build for me.

It occurs to me that there’s something it’s referring to when it says “recognized as a date format”. Is there somewhere I can change what date formats it knows?

EDIT: With @nowaq’s help, here’s the ultimate answer:

public static Lease fromJsonToLease(String json) {
    return new JSONDeserializer<Lease>()
            .use(null, Lease.class)
            .use(Date.class, new DateFormatter("yyyy-MM-dd"))
            .deserialize(json);
}

That way JSONDeserializer knows what class it’s dealing with AND builds a formatter for all the dates in that class. Wicked!

Answer 1

Your question is very related to this one: Spring-roo REST JSON controllers mangle date fields Take a look and make sure you’re using correct DateTrasformer(s) with your JSON deserializers. E.g.

new JSONDeserializer()
      .use(Date.class, new DateTransformer("yyyy-MM-dd") )
      .deserialize( people );