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# Key Annotation

Sets the Key for type conversion.

## Usage

The `Key` annotation must be applied at field or method level.

## Parameters

Parameter | Required | Default | Description
--- | --- | --- | ---
value | no | java.lang.Object.class | The key property value.

## Examples

     // The key property for User objects within the users collection is the <code>userName</code> attribute.
     @Key( value = java.lang.Long.class )
     private Map<Long, User> userMap;

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