Description Blaise Doughan 2011-04-04 11:04:23 EDT

An error is occurring during the marshal operation when a DOMHandler is used with a non-DOM field/property:

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlAnyElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name="main")
@XmlAccessorType(XmlAccessType.FIELD)
public class Main {

    private String name;

    private Integer maxInstances;

    @XmlAnyElement(value=ParameterHandler.class)
    private String parameters;

}

and 

import java.io.StringReader;
import java.io.StringWriter;

import javax.xml.bind.ValidationEventHandler;
import javax.xml.bind.annotation.DomHandler;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

public class ParameterHandler implements DomHandler<String, StreamResult> {

    private static final String PARAMETERS_START_TAG = "<parameters>";
    private static final String PARAMETERS_END_TAG = "</parameters>";

    private StringWriter xmlWriter = new StringWriter(); 

    public StreamResult createUnmarshaller(ValidationEventHandler errorHandler) {
        return new StreamResult(xmlWriter);
    }

    public String getElement(StreamResult rt) {
        String xml = rt.getWriter().toString();
        int beginIndex = xml.indexOf(PARAMETERS_START_TAG) + PARAMETERS_START_TAG.length();
        int endIndex = xml.indexOf(PARAMETERS_END_TAG);
        return xml.substring(beginIndex, endIndex);
    }

    public Source marshal(String n, ValidationEventHandler errorHandler) {
        String xml = PARAMETERS_START_TAG + n.trim() + PARAMETERS_END_TAG;
        StringReader xmlReader = new StringReader(xml);
        return new StreamSource(xmlReader);
    }

}

With XML:

<main>
  <name>JET</name>
  <maxInstances>5</maxInstances>
  <parameters>
    <a>1</a>
    <b>
      <b1>test1</b1>
      <b2>test2</b2>
    </b>
  </parameters>
</main>