I am fairly new to JAXB and so I am wondering if anybody in the group can
give me some advice on the best way to update an XML file using JAXB.
In an application I am developing, the XML passes through a number of
different systems with each system adding data to the original XML file.
We have a common format (dtd/schema) for the XML file with each system's
elements being defined as optional.
I was hoping to simply unmarshal the file, do any updating on the content
object using the set methods, then marshal back to a new version of the
file.
The problem I am having is that if the XML file does not contain an empty
tag value for the optional element, then the JAXB set method returns a
null exception. I can get round this by making the elements mandatory and
have the original system generate empty element values for all systems,
but this seems a bit messy.
Another alternative is to create a new version of the file using
ObjectFactory using the original values e.g.
newRules.setFormNumber(oldRules.getFormNumber());
and adding on the new values - but this seems a bit long winded.
Am I missing anything? Can anybody suggest what is the best way to do this?
Geoff Bawn
Phone (0191) 203-5864
E-Mail Geoff.Bawn_at_PPA.NHS.UK
Fax (0191) 203-5264
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