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PODynamic JAXB support to convert XML to JSON
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  1. PODynamic JAXB support to convert XML to JSON
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    copied!<p>I am using eclipse link(v2.5.0) Dynamic JAXB to convert XML to JSON and viceversa.</p> <p>customer.xsd</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8" standalone="yes"?&gt; &lt;xs:schema version="1.0" xmlns:xs="http://www.w3.org/2001/XMLSchema"&gt; &lt;xs:element name="address" type="address"/&gt; &lt;xs:element name="customer" type="customer"/&gt; &lt;xs:complexType name="address"&gt; &lt;xs:sequence&gt; &lt;xs:element name="city" type="xs:string" minOccurs="0"/&gt; &lt;xs:element name="street" type="xs:string" minOccurs="0"/&gt; &lt;xs:element name="type" type="xs:string"/&gt; &lt;/xs:sequence&gt; &lt;/xs:complexType&gt; &lt;xs:complexType name="customer"&gt; &lt;xs:sequence&gt; &lt;xs:element ref="address" minOccurs="0"/&gt; &lt;/xs:sequence&gt; &lt;/xs:complexType&gt; &lt;/xs:schema&gt; </code></pre> <p>customer.xml</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;customer&gt; &lt;name&gt;Jane Doe&lt;/name&gt; &lt;address&gt; &lt;city&gt;My Town&lt;/city&gt; &lt;street&gt;123 Any Street&lt;/street&gt; &lt;type&gt;work&lt;/type&gt; &lt;/address&gt; &lt;/customer&gt; </code></pre> <p>customer.json</p> <pre><code>{ "address" : { "city" : "My Town", "street" : "123 Any Street", "type" : "work" } } </code></pre> <p>MyCode</p> <pre><code>public class Demo { public static void main(String[] args) { try { // create DynamicJAXBContext FileInputStream xsdInputStream = new FileInputStream("D:\\GUI\\customer.xsd"); DynamicJAXBContext jaxbContext = DynamicJAXBContextFactory.createContextFromXSD(xsdInputStream, null, null, null); // Unmarshal XML--&gt; Java FileInputStream xmlInputStream = new FileInputStream("D:\\GUI\\customer.xml"); JAXBUnmarshaller unmarshaller = jaxbContext.createUnmarshaller(); JAXBElement&lt;DynamicEntity&gt; root = (JAXBElement)unmarshaller.unmarshal(xmlInputStream); JAXBMarshaller marshaller = jaxbContext.createMarshaller(); DynamicEntity javaResponse = root.getValue(); Map namespaces = new HashMap(); // Marshal Java --&gt; JSON JAXBMarshaller jsonMarshaller = jaxbContext.createMarshaller(); jsonMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); jsonMarshaller.setProperty(MarshallerProperties.MEDIA_TYPE, "application/json"); jsonMarshaller.setProperty(MarshallerProperties.NAMESPACE_PREFIX_MAPPER, namespaces); FileOutputStream jsonOutputStream = new FileOutputStream("D:\\GUI\\customer.json"); jsonMarshaller.marshal(javaResponse, jsonOutputStream); // JSON-&gt;JAVA-&gt;XML JAXBUnmarshaller jsonUnmarshaller = jaxbContext.createUnmarshaller(); jsonUnmarshaller.setProperty(UnmarshallerProperties.MEDIA_TYPE, "application/json"); jsonUnmarshaller.setProperty(UnmarshallerProperties.JSON_NAMESPACE_PREFIX_MAPPER, namespaces); StreamSource json = new StreamSource("D:\\GUI\\customer.json"); JAXBElement&lt;DynamicEntity&gt; myroot = (JAXBElement)jsonUnmarshaller.unmarshal(json); DynamicEntity myResponse = myroot.getValue(); marshaller.marshal(myResponse, System.out); } catch (JAXBException e) { e.printStackTrace(); } catch (FileNotFoundException e) { e.printStackTrace(); } } } </code></pre> <p>Exception</p> <pre><code>Exception in thread "main" java.lang.NullPointerException at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:264) at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:443) at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:296) at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parseRoot(JSONReader.java:166) at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:125) at org.eclipse.persistence.internal.oxm.record.json.JSONReader.parse(JSONReader.java:140) at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:778) at org.eclipse.persistence.internal.oxm.record.SAXUnmarshaller.unmarshal(SAXUnmarshaller.java:666) at org.eclipse.persistence.oxm.XMLUnmarshaller.unmarshal(XMLUnmarshaller.java:593) at org.eclipse.persistence.jaxb.JAXBUnmarshaller.unmarshal(JAXBUnmarshaller.java:287) at Demo.main(Demo.java:47) </code></pre> <p>My questions</p> <p>1.Does eclipse link Dynamic JAXB officially support XML to JSON and viceversa conversions as I have tried above, as I could not see any such examples?</p> <p>2.How to avoid the above nullpointer exception and still have an element named "type" defined as part of the schema? Is this a bug? Are there any workarounds? I have written the demo code only to highlight the same problem I face elsewhere where I use multiple XML schemas and require a namespace aware handling for JSON conversion.</p>
 

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