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POJAXB partial-unmarshalling Elements without @XMLRootElement
 

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    <p>I am using the <strong>partial-unmarshalling</strong> example of <strong>JAXB</strong>, but I am unable to unmarshal XML-Elements which are not on the root-level (cause they don't have an @XmlRootElement tag). In my example I tried to read the shipTo-Element instead of the purchaseOrder-Element. </p> <p>Normally I would work with JAXBElement unmarshal(Source source,Class declaredType) but since the example is using an UnmarshallerHandler and a XMLFilterImpl I don't know where to tell Jaxb which Class it should use. </p> <p>My error message is: Caused by: javax.xml.bind.UnmarshalException: unexpected element (uri:"", local:"shipTo"). Expected elements are &lt;{}comment>,&lt;{}purchaseOrder>,&lt;{}purchaseOrders></p> <p>I googled around a lot, but didn't find anything useful yet.</p> <p>Here is the example code from the JaxB-Webpage:</p> <p><em>Main.java</em></p> <pre><code>public class Main { public static void main( String[] args ) throws Exception { // create JAXBContext for the primer.xsd JAXBContext context = JAXBContext.newInstance("primer"); // create a new XML parser SAXParserFactory factory = SAXParserFactory.newInstance(); factory.setNamespaceAware(true); XMLReader reader = factory.newSAXParser().getXMLReader(); // prepare a Splitter Splitter splitter = new Splitter(context); // connect two components reader.setContentHandler(splitter); for( int i=0; i&lt;args.length; i++ ) { // parse all the documents specified via the command line. // note that XMLReader expects an URL, not a file name. // so we need conversion. reader.parse(new File(args[i]).toURL().toExternalForm()); } } </code></pre> <p>}</p> <p><em>Splitter.java</em></p> <pre><code>public class Splitter extends XMLFilterImpl { public Splitter( JAXBContext context ) { this.context = context; } /** * We will create unmarshallers from this context. */ private final JAXBContext context; public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException { if( depth!= 0 ) { // we are in the middle of forwarding events. // continue to do so. depth++; super.startElement(namespaceURI, localName, qName, atts); return; } if( namespaceURI.equals("") &amp;&amp; localName.equals("purchaseOrder") ) { // start a new unmarshaller Unmarshaller unmarshaller; try { unmarshaller = context.createUnmarshaller(); } catch( JAXBException e ) { // there's no way to recover from this error. // we will abort the processing. throw new SAXException(e); } unmarshallerHandler = unmarshaller.getUnmarshallerHandler(); // set it as the content handler so that it will receive // SAX events from now on. setContentHandler(unmarshallerHandler); // fire SAX events to emulate the start of a new document. unmarshallerHandler.startDocument(); unmarshallerHandler.setDocumentLocator(locator); Enumeration e = namespaces.getPrefixes(); while( e.hasMoreElements() ) { String prefix = (String)e.nextElement(); String uri = namespaces.getURI(prefix); unmarshallerHandler.startPrefixMapping(prefix,uri); } String defaultURI = namespaces.getURI(""); if( defaultURI!=null ) unmarshallerHandler.startPrefixMapping("",defaultURI); super.startElement(namespaceURI, localName, qName, atts); // count the depth of elements and we will know when to stop. depth=1; } } public void endElement(String namespaceURI, String localName, String qName) throws SAXException { // forward this event super.endElement(namespaceURI, localName, qName); if( depth!=0 ) { depth--; if( depth==0 ) { // just finished sending one chunk. // emulate the end of a document. Enumeration e = namespaces.getPrefixes(); while( e.hasMoreElements() ) { String prefix = (String)e.nextElement(); unmarshallerHandler.endPrefixMapping(prefix); } String defaultURI = namespaces.getURI(""); if( defaultURI!=null ) unmarshallerHandler.endPrefixMapping(""); unmarshallerHandler.endDocument(); // stop forwarding events by setting a dummy handler. // XMLFilter doesn't accept null, so we have to give it something, // hence a DefaultHandler, which does nothing. setContentHandler(new DefaultHandler()); // then retrieve the fully unmarshalled object try { JAXBElement&lt;PurchaseOrderType&gt; result = (JAXBElement&lt;PurchaseOrderType&gt;)unmarshallerHandler.getResult(); // process this new purchase order process(result.getValue()); } catch( JAXBException je ) { // error was found during the unmarshalling. // you can either abort the processing by throwing a SAXException, // or you can continue processing by returning from this method. System.err.println("unable to process an order at line "+ locator.getLineNumber() ); return; } unmarshallerHandler = null; } } } public void process( PurchaseOrderType order ) { System.out.println("this order will be shipped to " + order.getShipTo().getName() ); } /** * Remembers the depth of the elements as we forward * SAX events to a JAXB unmarshaller. */ private int depth; /** * Reference to the unmarshaller which is unmarshalling * an object. */ private UnmarshallerHandler unmarshallerHandler; /** * Keeps a reference to the locator object so that we can later * pass it to a JAXB unmarshaller. */ private Locator locator; public void setDocumentLocator(Locator locator) { super.setDocumentLocator(locator); this.locator = locator; } /** * Used to keep track of in-scope namespace bindings. * * For JAXB unmarshaller to correctly unmarshal documents, it needs * to know all the effective namespace declarations. */ private NamespaceSupport namespaces = new NamespaceSupport(); public void startPrefixMapping(String prefix, String uri) throws SAXException { namespaces.pushContext(); namespaces.declarePrefix(prefix,uri); super.startPrefixMapping(prefix, uri); } public void endPrefixMapping(String prefix) throws SAXException { namespaces.popContext(); super.endPrefixMapping(prefix); } </code></pre> <p>}</p> <p><em>Primer.xsd</em></p> <pre><code> &lt;xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"&gt; &lt;xsd:annotation&gt; &lt;xsd:documentation xml:lang="en"&gt; Purchase order schema for Example.com. Copyright 2000 Example.com. All rights reserved. &lt;/xsd:documentation&gt; &lt;/xsd:annotation&gt; &lt;xsd:element name="purchaseOrders"&gt; &lt;xsd:complexType&gt; &lt;xsd:sequence&gt; &lt;xsd:element ref="purchaseOrder" minOccurs="0" maxOccurs="unbounded"/&gt; &lt;/xsd:sequence&gt; &lt;/xsd:complexType&gt; &lt;/xsd:element&gt; &lt;xsd:element name="purchaseOrder" type="PurchaseOrderType"/&gt; &lt;xsd:element name="comment" type="xsd:string"/&gt; &lt;xsd:complexType name="PurchaseOrderType"&gt; &lt;xsd:sequence&gt; &lt;xsd:element name="shipTo" type="USAddress"/&gt; &lt;xsd:element name="billTo" type="USAddress"/&gt; &lt;xsd:element ref="comment" minOccurs="0"/&gt; &lt;xsd:element name="items" type="Items"/&gt; &lt;/xsd:sequence&gt; &lt;xsd:attribute name="orderDate" type="xsd:date"/&gt; &lt;/xsd:complexType&gt; &lt;xsd:complexType name="USAddress"&gt; &lt;xsd:sequence&gt; &lt;xsd:element name="name" type="xsd:string"/&gt; &lt;xsd:element name="street" type="xsd:string"/&gt; &lt;xsd:element name="city" type="xsd:string"/&gt; &lt;xsd:element name="state" type="xsd:string"/&gt; &lt;xsd:element name="zip" type="xsd:decimal"/&gt; &lt;/xsd:sequence&gt; &lt;xsd:attribute name="country" type="xsd:NMTOKEN" fixed="US"/&gt; &lt;/xsd:complexType&gt; &lt;xsd:complexType name="Items"&gt; &lt;xsd:sequence&gt; &lt;xsd:element name="item" minOccurs="0" maxOccurs="unbounded"&gt; &lt;xsd:complexType&gt; &lt;xsd:sequence&gt; &lt;xsd:element name="productName" type="xsd:string"/&gt; &lt;xsd:element name="quantity"&gt; &lt;xsd:simpleType&gt; &lt;xsd:restriction base="xsd:positiveInteger"&gt; &lt;xsd:maxExclusive value="100"/&gt; &lt;/xsd:restriction&gt; &lt;/xsd:simpleType&gt; &lt;/xsd:element&gt; &lt;xsd:element name="USPrice" type="xsd:decimal"/&gt; &lt;xsd:element ref="comment" minOccurs="0"/&gt; &lt;xsd:element name="shipDate" type="xsd:date" minOccurs="0"/&gt; &lt;/xsd:sequence&gt; &lt;xsd:attribute name="partNum" type="SKU" use="required"/&gt; &lt;/xsd:complexType&gt; &lt;/xsd:element&gt; &lt;/xsd:sequence&gt; &lt;/xsd:complexType&gt; &lt;!-- Stock Keeping Unit, a code for identifying products --&gt; &lt;xsd:simpleType name="SKU"&gt; &lt;xsd:restriction base="xsd:string"&gt; &lt;xsd:pattern value="\d{3}-[A-Z]{2}"/&gt; &lt;/xsd:restriction&gt; &lt;/xsd:simpleType&gt; &lt;/xsd:schema&gt; </code></pre> <p><em>test.xml</em></p> <pre><code>&lt;purchaseOrders&gt; &lt;!-- 1st --&gt; &lt;purchaseOrder orderDate="1999-10-20"&gt; &lt;shipTo country="US"&gt; &lt;name&gt;Alice Smith&lt;/name&gt; &lt;street&gt;123 Maple Street&lt;/street&gt; &lt;city&gt;Cambridge&lt;/city&gt; &lt;state&gt;MA&lt;/state&gt; &lt;zip&gt;12345&lt;/zip&gt; &lt;/shipTo&gt; &lt;billTo country="US"&gt; &lt;name&gt;Robert Smith&lt;/name&gt; &lt;street&gt;8 Oak Avenue&lt;/street&gt; &lt;city&gt;Cambridge&lt;/city&gt; &lt;state&gt;MA&lt;/state&gt; &lt;zip&gt;12345&lt;/zip&gt; &lt;/billTo&gt; &lt;items/&gt; &lt;/purchaseOrder&gt; &lt;/purchaseOrders&gt; </code></pre>
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    1. COWhen I run your example I get "this order will be shipped to Alice Smith".
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    2. COYes, correct! The code works, but if you change it that way that it should read "shipTo" instead of "purchaseOrder" the error is coming up
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