How to exclude a property from ser/de?
Annotate your field and getter/setter with @JsonIgnore.
How to include a field or method from ser/de?
Annotate it with @JsonProperty or use GensonBuilder.
You can even indicate if you want it to be included only in serialization or deserialization.
How to skip null values from output?
new GensonBuilder().setSkipNull(true).create();How to create a custom Converter?
See the custom converter section of the user guide.
How to store state/share data from one converter to another?
- Use Context class (preferred solution), it is intended to be shared across all converters for a single execution and already provides some usefull methods to store/retrieve data.
- Use ThreadLocalHolder which internally uses a ThreadLocal map to store data.
How to change the default visibility of fields, methods and constructors?
Genson uses VisibilityFilter class to filter fields, methods and constructors by their Modifiers. For example if you want to accept public, protected and private fields :
new GensonBuilder().useFields(true, VisibilityFilter.PRIVATE).useMethods(true).create();
// you can also define a custom visibility filter :
new GensonBuilder().useFields(true, new VisibilityFilter(Modifier.TRANSIENT, Modifier.STATIC)).create();How to use only fields or methods?
For example if you want to use only fields :
new GensonBuilder().useMethods(false).useFields(true, VisibilityFilter.PRIVATE).create();You need to change the visibility filter for fields as by default it will only use fields with public/package visibility.
How to deserialize to an interface/abstract class?
See the class metadata mechanism discussed in the Getting Started Guide.
How to deserialize a class without a no argument constructor?
The main problem in using constructors with arguments is to resolve parameter names, as they are not available through introspection. See the solutions described in the Getting Started guide.
How to use case insensitive enums?
By default enum names must match exactly. To make the matching case insensitive register a customized instance of EnumConverterFactory.
Genson genson = new GensonBuilder().withConverterFactory(new DefaultConverters.EnumConverterFactory(false)).create();