Jackson4GAE is a Java library of Jackson serializers and deserializers for common Google AppEngine data types.
Your class can be serialized as JSON including GAE-specific classes:
{
key: "Invoice(23)",
geopt: { lat: 0.345, lng: 0.123 },
cursor: "E-ABAIICHmoRamFja3NvbjRnYWUtdGVzdHNyCQsSA2ZvbxgBDBQ"
}Currently the library supports Key, BlobKey, Text, GeoPt, Cursor and Search Cursors.
| Class | Serialized as | Example |
|---|---|---|
| Key | Key.getKind() + { Key.getId() or Key.getName() } |
"Invoice(20)" "User('icoloma')" |
| BlobKey | BlobKey.getKeyString() |
"H9gv9XtAEst7S9JaBoyDmA" |
| Text | Text.getValue() |
"foobar" |
| GeoPt | Json object with lat and lng |
{ lat: 0.234, lng: 0.345 } |
| Cursor | Cursor.toWebSafeString() |
"E-ABAIICHmoRamFja3NvbjRnYWUtdGVzdHNyCQsSA2ZvbxgBDBQ" |
| Search cursor | Cursor.toWebSafeString() |
"E-ABAIICHmoRamFja3NvbjRnYWUtdGVzdHNyCQsSA2ZvbxgBDBQ" |
Include this in your pom.xml:
<dependency>
<groupId>org.extrema-sistemas</groupId>
<artifactId>jackson4gae</artifactId>
</dependency>To use, just add the following to your ObjectMapper initialization code:
objectMapper.registerModule(new GaeJacksonModule());ObjectMapper is not cheap to initialize, so you should keep the instance as a singleton somewhere, preferably in your Dependency Injection configuration.