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POJAXB: How to customize Xml serialization of double fields
 

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    <p>I have a legacy class, with a lot of public double fields. All double fields are initialized with <code>Double.MAX_VALUE</code> to indicate that they are empty. (The legacy serialization is coded to ignore the field and not serialize if field is equals to <code>Double.MAX_VALUE</code>).</p> <p>We are now trying to serialize this class to Xml using JAXB Marshaller. It is working fine, except that we want to prevent generating Xml for fields which equal <code>Double.MAX_VALUE</code>. </p> <p>We aren't using a separate JAXB schema, just marking up our classes with various <code>javax.xml.bind.annotation</code> Annotations. If a schema is used, you can add a <code>&lt;javaType&gt;</code> element to specify a custom DataType converter. Is there any way to do this using Annotations or programmatically?</p> <p>After trying approach recommended below, I still can't get <code>XmlAdapter</code> picked up:</p> <pre><code>@XmlJavaTypeAdapters({ @XmlJavaTypeAdapter(value=EmptyDoubleValueHandler.class, type=Double.class), @XmlJavaTypeAdapter(value=EmptyDoubleValueHandler.class, type=double.class)}) package tta.penstock.data.iserver; import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapter; import javax.xml.bind.annotation.adapters.XmlJavaTypeAdapters; </code></pre> <p>My top level class is: tta.penstock.data.iserver.OrderBlotter, which contains a list of tta.penstock.data.iserver.OrderResponseWrappers which extends <code>com.eztech.OrderResponse</code>. All the double fields are contained in <code>com.eztech.OrderResponse</code>.</p> <p>My unit test code does the following:</p> <pre><code>JAXBContext context = JAXBContext.newInstance(new Class[] { OrderBlotter.class, OrderResponseWrapper.class, OrderResponse.class}); Marshaller marshaller = context.createMarshaller(); StringWriter stringWriter = new StringWriter(); marshaller.marshal(blotter, stringWriter); System.out.println("result xml=\n" + stringWriter.toString()); </code></pre> <p>But the double values still don't get handled by the <code>XmlAdapter</code>. I know I'm missing something basic, but I'm not sure what it is.</p>
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