When I run the attached Junit test, I get the output below. The
"unrecognized property" appears to be the null at the end of the Java
string into which the object was serialized. (NOTE: this is a spike to see
if serialization code using an obsolete javax.xml class [OutputFormat] can
be replaced with XmlMapper.) Am I misusing XmlMapper here?
<?xml version="1.0" encoding="UTF-8"?><Companies
xmlns="https://crunchify.com/TestXMLdom";>
<Company id="1">
<Name>Paypal</Name>
<Type>Payment</Type>
<Employees>1000</Employees>
</Company>
<Company id="2">
<Name>eBay</Name>
<Type>Shopping</Type>
<Employees>2000</Employees>
</Company>
<Company id="3">
<Name>Google</Name>
<Type>Search</Type>
<Employees>3000</Employees>
</Company>
</Companies>
XML DOM Created Successfully..
Serialized length: 487
Serialized length without whitespage: 481
com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException:
Unrecognized field "" (class netmedical.util.TestXMLdom), not marked as
ignorable (0 known properties: ])
at [Source: (StringReader); line: 1, column: 488] (through reference
chain: netmedical.util.TestXMLdom[""])
at
com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException.from(UnrecognizedPropertyException.java:62)
.....
Process finished with exit code 255
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package netmedical.util;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;
import org.junit.Before;
import org.junit.Test;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.IOException;
import static netmedical.util.TestXMLdom.createDom;
public class WhenDOMIsSerialized {
XmlMapper mapper = new XmlMapper();
@Before
public void setup() {
}
@Test
public void testDocumentCanBeDeserialized() throws IOException {
Document originalDom = createDom();
String serializedDom = mapper.writeValueAsString(originalDom);
System.out.println("Serialized length: "+ serializedDom.length());
System.out.println("Serialized length without whitespage: "+ serializedDom.replaceAll("\\s+","").length());
TestXMLdom deserializedDom = mapper.readValue(serializedDom,
TestXMLdom.class);
}
}
/**
* Modified version of CrunchifyCreateXMLDOM class
* @see <a href="https://crunchify.com/java-simple-way-to-write-xml-dom-file-in-java/";>
* Java: Simple Way to Write XML (DOM) File in Java
* </a>
*/
class TestXMLdom {
public static Document createDom (){
DocumentBuilderFactory icFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder icBuilder;
Document doc = null;
try {
icBuilder = icFactory.newDocumentBuilder();
doc = icBuilder.newDocument();
Element mainRootElement = doc.createElementNS("https://crunchify.com/TestXMLdom";, "Companies");
doc.appendChild(mainRootElement);
// append child elements to root element
mainRootElement.appendChild(getCompany(doc, "1", "Paypal", "Payment", "1000"));
mainRootElement.appendChild(getCompany(doc, "2", "eBay", "Shopping", "2000"));
mainRootElement.appendChild(getCompany(doc, "3", "Google", "Search", "3000"));
// output DOM XML to console
Transformer transformer = TransformerFactory.newInstance().newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
DOMSource source = new DOMSource(doc);
StreamResult console = new StreamResult(System.out);
transformer.transform(source, console);
System.out.println("\nXML DOM Created Successfully..");
} catch (Exception e) {
e.printStackTrace();
}
return doc;
}
private static Node getCompany(Document doc, String id, String name, String age, String role) {
Element company = doc.createElement("Company");
company.setAttribute("id", id);
company.appendChild(getCompanyElements(doc, company, "Name", name));
company.appendChild(getCompanyElements(doc, company, "Type", age));
company.appendChild(getCompanyElements(doc, company, "Employees", role));
return company;
}
// utility method to create text node
private static Node getCompanyElements(Document doc, Element element, String name, String value) {
Element node = doc.createElement(name);
node.appendChild(doc.createTextNode(value));
return node;
}
}
