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    <pre><code>import static org.junit.Assert.*; import java.io.IOException; import java.io.StringWriter; import java.lang.reflect.Type; import org.codehaus.jackson.JsonGenerationException; import org.codehaus.jackson.JsonGenerator; import org.codehaus.jackson.JsonNode; import org.codehaus.jackson.map.JsonMappingException; import org.codehaus.jackson.map.ObjectMapper; import org.codehaus.jackson.map.SerializerProvider; import org.codehaus.jackson.map.annotate.JsonSerialize; import org.codehaus.jackson.map.ser.SerializerBase; import org.junit.Test; class Foo { public String bar; public String biz; } class FooContainer { public Foo fooA; @JsonSerialize(using = FooCustomSerializer.class) public Foo fooB; } class FooCustomSerializer extends SerializerBase&lt;Foo&gt; { public FooCustomSerializer() { super(Foo.class); } @Override public void serialize(Foo foo, JsonGenerator generator, SerializerProvider provider) throws IOException, JsonGenerationException { generator.writeStartObject(); generator.writeObjectField("bar", foo.bar); generator.writeEndObject(); } @Override public JsonNode getSchema(SerializerProvider arg0, Type arg1) throws JsonMappingException { return null; } } public class JacksonTest { @Test public void customField() throws Exception { FooContainer object = new FooContainer(); object.fooA = new Foo(); object.fooA.bar = "asdf"; object.fooA.biz = "fdsa"; object.fooB = new Foo(); object.fooB.bar = "qwer"; object.fooB.biz = "test"; ObjectMapper mapper = new ObjectMapper(); StringWriter writer = new StringWriter(); mapper.writeValue(writer, object); String expected = "{\"fooA\":{\"bar\":\"asdf\",\"biz\":\"fdsa\"},\"fooB\":{\"bar\":\"qwer\"}}"; assertEquals(expected, writer.toString()); } } </code></pre> <p>Using @JsonSerialize(using = FooCustomSerializer.class) on the public Foo fooB; field.</p> <p><a href="http://jackson.codehaus.org/1.9.9/javadoc/org/codehaus/jackson/map/annotate/JsonSerialize.html" rel="nofollow">http://jackson.codehaus.org/1.9.9/javadoc/org/codehaus/jackson/map/annotate/JsonSerialize.html</a></p>
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    1. POHow do I serialize an associated object differently using Jackson and annotations?
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    1. USFireblaze
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    1. COTrouble with this is that in the real world code there are many more attributes, I want all the rest to map naturally, and just to exclude this one field. That way I can add an attribute to Foo without having to remember to add the attribute to the serializer as well.
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      1. USRansom Briggs
    2. COThat constraint was not in your question. Perhaps you can post your real question?
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    3. COPerhaps you are asking: http://stackoverflow.com/questions/12616730/how-to-use-jackson-serializer-for-domain-object-used-for-different-services
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