java - Setting default values to null fields when mapping with Jackson

Question

I am trying to map some JSON objects to Java objects with Jackson. Some of the fields in the JSON object are mandatory(which I can mark with @NotNull) and some are optional.

After the mapping with Jackson, all the fields that are not set in the JSON object will have a null value in Java. Is there a similar annotation to @NotNull that can tell Jackson to set a default value to a Java class member, in case it is null?

Edit: To make the question more clear here is some code example.

The Java object:

class JavaObject {
    @NotNull
    public String notNullMember;

    @DefaultValue("Value")
    public String optionalMember;
}

The JSON object can be either:

{
    "notNullMember" : "notNull"
}

or:

{
    "notNullMember" : "notNull",
    "optionalMember" : "optional"
}

The @DefaultValue annotations is just to show what I am asking. It's not a real annotation. If the JSON object is like in the first example I want the value of the optionalMember to be "Value" and not null. Is there an annotation that does such a thing?

Answer 1

There is no annotation to set default value.
You can set default value only on java class level:

public class JavaObject 
{
    public String notNullMember;

    public String optionalMember = "Value";
}