Question

I have a very basic application that uses JAXB marshaller to validate input information against an xsd schema. I register a validation event handler to obtain information about the exceptions. What I would like to achieve is the ability to include this information into xml output structure I receive as a result of marshaling. I’ve included exception collection section into my xsd and now I can instantiate the corresponding exception object once an exception is encountered. The question is how do I attach this object to the rest of my JAXB generated Java objects structure considering the fact that marshaling process had already started? Is it even possible? Or should I try and modify the xml result after the marshaling is done? Any advice would be highly appreciated.
Thanks!

Answer 1

There a couple of ways to do this:

Option #1 – Add an “exceptions” Property to You Root Object

1. Ensure that the exceptions property is marshalled last, this can be configured using propOrder on the @XmlType annotation.
2. Create a validation handler that holds onto the root object.
3. When the validation handler encounters an exception, add that exception to the exceptions property on the root object.

Option #2 – Use an XMLStreamWriter

1. Create an XMLStreamWriter
2. Write out a root element
3. Set the validation handler on the marshaller, ensure that it will store the exceptions encountered.
4. Marshal the root object to the XMLStreamWriter.
5. Marshal the individual exceptions encountered to the XMLStreamWriter.
6. Write out the close for the root element.