Description Jorge Arrieta 2012-01-03 17:41:52 EST

When trying to create a JAXB Context which contains the classes below:

public class VOEntryType { 
    @XmlJoinNode(referencedXmlPath = "@id_option", xmlPath = "@id")
    public Option key; 

    @XmlValue
    public Integer value;
}

and 

public class Option {
	@XmlKey
	@XmlAttribute
	@XmlJavaTypeAdapter(IntegerToStringAdapter.class)
	private int id_option;
        ...

I get the following exception:

Exception [EclipseLink-50010] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.JAXBException
Exception Description: The property or field key must be an attribute because another field or property is annotated with XmlValue.
at org.eclipse.persistence.exceptions.JAXBException.propertyOrFieldShouldBeAnAttribute(JAXBException.java:233)


Now, trying adding an attribute, like this (which, doesn't look right):

   @XmlAttribute
   @XmlJoinNode(referencedXmlPath = "@id_option", xmlPath = "@id")
    public Option key; 

Results in:

java.lang.NullPointerException at org.eclipse.persistence.jaxb.compiler.SchemaGenerator.buildSchemaComponentsForXPath(SchemaGenerator.java:1018)