JsonSerializeAs

```
@Target({ANNOTATION_TYPE,METHOD,FIELD,TYPE,PARAMETER})
@Retention(RUNTIME)
public @interface JsonSerializeAs
```
Annotation to indicate override of intended serialization type; a more generic type (super-type) than declared one. Can be used on types (Classes) or on properties (property accessors like "getters", "setters" and constructor parameters). Overrides can apply to:
- value itself (for all types and properties)
- content of structured types (array and Collection elements; Map values)
- keys of Maps
To indicate that no override is to be used, Void.class is used as the marker (will use declared type) -- this is necessary as Annotation properties cannot have null values.
Example usage:
```
 public class POJO {
   // ValueImpl extends GenericValue
   @JsonSerializeAs(GenericValue.class)
   public ValueImpl value;

   @JsonSerializeAs(keys = GenericKey.class, content = GenericValue.class)
   public Map<KeyImpl, ValueImpl> props;
 }
```

Optional Element Summary

Optional Elements
Modifier and Type	Optional Element	Description
`java.lang.Class<?>`	`content`	Type to serialize content entries (array and `Collection` elements, `Map` values) as, instead of type declared.
`java.lang.Class<?>`	`key`	Type to serialize `Map` keys as, instead of type declared.
`java.lang.Class<?>`	`value`	Type to serialize values as, instead of type declared.

- Element Detail
  - value
```
java.lang.Class<?> value
```
    Type to serialize values as, instead of type declared. Must be a super-type of declared type (or type itself); otherwise an exception may be thrown by serializer.
    Bogus type Void is used to indicate that declared type is used as-is (i.e. this annotation property has no setting).
    
    Default:
    
    java.lang.Void.class
- - content
```
java.lang.Class<?> content
```
    Type to serialize content entries (array and Collection elements, Map values) as, instead of type declared. Must be a super-type of declared type (or type itself); otherwise an exception may be thrown by serializer.
    Bogus type Void is used to indicate that declared type is used as-is (i.e. this annotation property has no setting).
    
    Default:
    
    java.lang.Void.class
- - key
```
java.lang.Class<?> key
```
    Type to serialize Map keys as, instead of type declared. Must be a super-type of declared type (or type itself); otherwise an exception may be thrown by serializer.
    Bogus type Void is used to indicate that declared type is used as-is (i.e. this annotation property has no setting).
    
    Default:
    
    java.lang.Void.class