com.sun.istack.SAXException2 : Instance … is substituting “java.lang.Object”, but … is bound to an anonymous type

Question

I\'m upgrading a project to jaxb 2.2.7 from version 1.x.

I\'ve got the app working some of the time, but on some responses I see this:

java.lang.Runt         


        

Answer 1

The case that I noted does not depend on definitions in xsd-schema.

The actual problem was that we have Java classes that extend from a class generated from xml-schema.

And these classes are annotated with @XmlType(name = "") to make them anonymous (i.e. that generated tag does not contain xsi:type attribute and the generated xml-file remains valid for the initial-schema.

I found the clue to this solution in java, xsd & marshalling: jre bug, my fault or xsd issues?.

Since I can't modify the xsd (it is too complex and is already shared to the clients of our APIs), the solution is:

• Make a jaxb-binder that excludes the complexType to be generated into Java file and says JAXB to use the existing class instead. Binding file looks like this:

• In existing class, the class that we need to extend is NOT a JAXB-annotated class, just an abstract class:

    package my.existing.class;

    public abstract class TheClassFromWhichYouWantToExtend {
    }

• The field that links to this class from the parent class is annotated with @XmlAnyElement(lax = true):

    package my.existing.class;

    @XmlAccessorType(XmlAccessType.FIELD)
    @XmlType(...)
    public class TheClassYouWantToExclude {

        // ...
        @XmlAnyElement(lax = true)
        protected TheClassFromWhichYouWantToExtend theClassFromWhichYouWantToExtend;
    }