Deserialize Empty Strings As Default Primitive Values

See http://stackoverflow.com/questions/6661717/ for related issue and workaround using the current StdDeserializer._parseIntPrimitive(JsonParser, DeserializationContext) implementation.

Ok. Odd, I thought this had been changed to work the way described earlier. But apparently not.
Should obviously also work for wrappers as well.

Hmmh. I am not able to reproduce the issue...

Actually I think I know what could cause it, even thought I can't seem to be able to easily reproduce this – probably one must use auto-boxing or something.
But I can improve deserialization to make better use of JsonDeserializer.getNullValue() (which should always be called to produce appropriate null replacement: a relatively little known feature that's been there since 1.0). And it already returns non-null default value for primitive deserializers.

And I will also add JsonDeserializer.getEmptyValue(), which will be used to figure out presentation for "", mostly (although could be used for other non-null, non-valid things); and make it just call 'getNullValue()' as default implementation.

The problem occurs with no auto-boxing involved.

package fubar;

import org.codehaus.jackson.map.ObjectMapper;

public class Foo
{
 public static void main(String[] args) throws Exception
 {
  ObjectMapper mapper = new ObjectMapper();
  
  String json = "{\"n\":null}"; // {"n":null}
  Bar bar = mapper.readValue(json, Bar.class);
  System.out.println(bar.n); // 0
  
  String json2 = "{\"n\":\"\"}"; // {"n":""}
  Bar bar2 = mapper.readValue(json2, Bar.class);
  // throws JsonMappingException: 
  // Problem deserializing property 'n' 
  // (expected type: [simple type, class int]; actual type: [NULL]), 
  // problem: Can not set int field fubar.Bar.n to null value 
  // (through reference chain: fubar.Bar["n"])
 }
}

class Bar
{
 public int n = 42;
}

Interesting. Thanks you for the test case, should be easier to resolve now.

I fixed this issue, to the best of my knowledge (for all primitive types). Due to number of internal changes, it will be 1.9 only.