Genson de/serialization of private fileds

[Michal Stehlik]

Hi Eugen,

I have eg. class like this

public class ImmutableClass {

    private int myValue;

    public int getMyValue() {

        return myValue;

    }

}

I want to set this private property directly via deserializing of json. How is this possible?

I use GensonBuilder.useFields(true).

[Eugen Cepoi]

Hi Michal,

Try GensonBuilder.useFields(true, VisibilityFilter.PRIVATE), this will include also private/protected fields. If you want to use only fields you can via .useMethods(false).

Note that you can also have a constructor that takes as argument all your properties (the names should match with the ones in the json) and sets them. If you make the properties final you could even make them  public. You can then tell to Genson to work with them via builder.useConstructorWithArguments(true). If you have multiple constructors then mark with @JsonCreator the one you want Genson to use. This is the way usually to achieve immutable structures.

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[Michal Stehlik]

Thank you a lot, this helps. Is it also possible combine visibilities eg.: GensonBuilder.useFields(true, VisibilityFilter.PRIVATE | VisibilityFilter.PROTECTED) ?

[Eugen Cepoi]

Yep you can (but not exactly this way), have a look at the implementation of VisibilityFilter https://github.com/owlike/genson/blob/master/genson/src/main/java/com/owlike/genson/reflect/VisibilityFilter.java.

Note that the visibilityfilter defines what modifiers should be excluded, for example the private one is:

new VisibilityFilter(Modifier.TRANSIENT, Modifier.NATIVE, Modifier.STATIC)

adding Modifier.PRIVATE would forbid private but allows protected, public etc.

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