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    <pre><code>LongJsonDeserializer deserializer = new LongJsonDeserializer(); SimpleModule module = new SimpleModule("LongDeserializerModule", new Version(1, 0, 0, null, null, null)); module.addDeserializer(Long.class, deserializer); ObjectMapper mapper = new ObjectMapper(); mapper.registerModule(module); </code></pre> <hr> <p>Here's a full demo application. This works with the latest release of Jackson, and probably also with Jackson versions going back to 1.7.</p> <pre><code>import java.io.IOException; import org.codehaus.jackson.JsonParser; import org.codehaus.jackson.JsonProcessingException; import org.codehaus.jackson.Version; import org.codehaus.jackson.map.DeserializationContext; import org.codehaus.jackson.map.JsonDeserializer; import org.codehaus.jackson.map.ObjectMapper; import org.codehaus.jackson.map.module.SimpleModule; public class Foo { public static void main(String[] args) throws Exception { TestBean bean = new TestBean(); bean.value = 42L; ObjectMapper mapper = new ObjectMapper(); String beanJson = mapper.writeValueAsString(bean); System.out.println(beanJson); // output: {"value":42} TestBean beanCopy1 = mapper.readValue(beanJson, TestBean.class); System.out.println(beanCopy1.value); // output: 42 SimpleModule module = new SimpleModule("LongDeserializerModule", new Version(1, 0, 0, null)); module.addDeserializer(Long.class, new LongJsonDeserializer()); mapper = new ObjectMapper(); mapper.registerModule(module); TestBean beanCopy2 = mapper.readValue(beanJson, TestBean.class); System.out.println(beanCopy2.value); // output: 126 } } class TestBean { Long value; public Long getValue() {return value;} public void setValue(Long value) {this.value = value;} } class LongJsonDeserializer extends JsonDeserializer&lt;Long&gt; { @Override public Long deserialize(JsonParser jp, DeserializationContext ctxt) throws IOException, JsonProcessingException { Long value = jp.getLongValue(); return value * 3; } } </code></pre>
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    1. POSetting up JSON custom deserializer
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    1. COThis is same as described in http://wiki.fasterxml.com/JacksonHowToCustomDeserializers, which I have already followed!
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    2. COAh. I read the original question too fast, maybe. Taking another look...
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    3. COWhat I originally posted addressed the question you asked correctly. I'll update this post with a full demo application.
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