JAXB Java generating XML, Why lowercase?

Question

When I run this code:

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.b         


        

Answer 1

My solution after put @XmlElement(name="Xxxxx") to fields and used XStream.aliasField(). This is more generic because it uses annotations and scans other class calls in the same package.

import java.lang.reflect.Field;
import java.util.Map;
import java.util.TreeMap;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlAttribute;
import com.thoughtworks.xstream.XStream;
import my.MyClassGeneratedFromXsdToJaxB;

public class TestChangeFirstLetterXml {

public static void main(String[] args) throws ClassNotFoundException {
    MyClassGeneratedFromXsdToJaxB myClassGeneratedFromXsdToJaxB=new MyClassGeneratedFromXsdToJaxB();
    XStream xstream = new XStream();
    xstream.autodetectAnnotations(true);
    xstream = makeAliasAnnotatedFields(xstream, MyClassGeneratedFromXsdToJaxB.class, "FirstTagOrRoot");
    //System.out.println(xstream.toXML(myClassGeneratedFromXsdToJaxB));
}

public static XStream makeAliasAnnotatedFields(XStream xstream, Class myclass, String firstTag)
        throws ClassNotFoundException {
    xstream.alias(firstTag, myclass);
    Map<String, Object[]> aliaslist = getListAlias(myclass);
    for (String key : aliaslist.keySet()) {
        Object[] aliasvalue = new Object[3];
        aliasvalue = aliaslist.get(key);
        String xmlTag = new String((String) aliasvalue[0]);
        Class<?> classJaxb = (Class<?>) aliasvalue[1];
        String tagToRename = new String((String) aliasvalue[2]);
        xstream.aliasField(xmlTag, classJaxb, tagToRename);
        System.out.println("AliasField " + xmlTag + " " + classJaxb.getName() + " " + tagToRename);

    }
    return xstream;
}

public static Map<String, Object[]> getListAlias(Class<?> classToCheck)
        throws ClassNotFoundException {
    /* Read recursive fields of the class */
    Field[] fs = classToCheck.getDeclaredFields();
    String annotationsPackage = classToCheck.getPackage().getName();
    String classSimpleName = new String(classToCheck.getSimpleName());
    /* it is necessary avoid loop */
    Map<String, Object[]> aliasStart = new TreeMap<String, Object[]>();
    /* */
    for (int i = 0; i < fs.length; i++) {
        String nameField = fs[i].getName();
        String classFieldName = new String(fs[i].getType().getName());
        String nameXmlXsd = new String("");
        String idkey = new String(annotationsPackage + ".");
        if (fs[i].isAnnotationPresent(javax.xml.bind.annotation.XmlElement.class)) {
            XmlElement atrib = fs[i].getAnnotation(XmlElement.class);
            nameXmlXsd = new String(atrib.name());
            idkey = new String(idkey + classSimpleName + ".Element." + nameField);
        } else if (fs[i].isAnnotationPresent(javax.xml.bind.annotation.XmlAttribute.class)) {
            XmlAttribute atrib = fs[i].getAnnotation(XmlAttribute.class);
            nameXmlXsd = new String(atrib.name());
            idkey = new String(idkey + classSimpleName + ".Type." + nameField);
        }

        if (aliasStart.containsKey(idkey)) /* avoid loop */
            continue;
        if (nameXmlXsd.equals("Signature")) // My particular condition
            continue;

        if (!nameXmlXsd.equals(classFieldName)) {
            // xstrem.aliasField(a,b,c)
            Object[] alias = new Object[3];
            alias[0] = new String(nameXmlXsd);
            alias[1] = classToCheck;
            alias[2] = new String(nameField);
            aliasStart.put(idkey, alias);
        }
        if (classFieldName.indexOf(annotationsPackage) > -1) {
            Class<?> c = Class.forName(classFieldName);
            Map<String, Object[]> aliaslist = getListAlias(c);
            for (String key : aliaslist.keySet()) {
                Object[] aliasvalue = new Object[3];
                aliasvalue = aliaslist.get(key);
                aliasStart.put(key, aliasvalue);
            }
        }

    }
    return aliasStart;
}
}

Answer 2

For specific elements...

@XmlElement( name = "Code")
private String code;

For the object....

@XmlRootElement(name="Employee")
public class Employee{ ...

Answer 3

An alternative answer, if JAXB is not a MUST, then you can actually use org.json jar to convert the object to a JSONObject, then from there, you can use the XML object to convert the JSONObject to an XML. You will need a few tweaks before it can be a standalone XML.

A code snippet example:

public static String getXMLString(Object o){
    JSONObject json = new JSONObject(o);
    String result = 
        "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>" + 
        XML.toString(json, o.getClass().getSimpleName());
    return result;
}

Answer 4

The behaviour you are seeing is the result of the standard JAXB (JSR-222) XML name to Java name conversion algorithm.

You can use the @XmlRootElement annotation to specify a name:

@XmlRootElement(name="Employee")
@XmlAccessorType(XmlAccessType.FIELD)
class Employee {
    ...
}

I'm the EclipseLink JAXB (MOXy) lead, and we have an extension that allows you to override the default name conversion algorithm that you may be interested in:

• http://blog.bdoughan.com/2011/05/overriding-jaxbs-name-mangling.html