Malachi
Thanks for replying.
I'll try to explain with an example. We have 3 systems all using the same schema file as follows:
<------Schema ¯-->
<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="
http://www.w3.org/2000/10/XMLSchema" elementFormDefault="qualified">
<xsd:element name="Root">
<xsd:complexType>
<xsd:sequence>
<xsd:element ref="SystemA"/>
<xsd:element ref="SystemB" minOccurs="0"/>
<xsd:element ref="SystemC" minOccurs="0"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
<xsd:element name="SystemA" type="xsd:string"/>
<xsd:element name="SystemB" type="xsd:string"/>
<xsd:element name="SystemC" type="xsd:string"/>
</xsd:schema>
<---- End Schema ¯---->
SystemA data is mandatory, SystemB and SystemC data is optional.
System A creates the original XML e.g.
<Root>
<SystemA>data for system A here </SystemA>
</Root>
SystemB needs to unmarshal the XML, add their bit of data, and marshall the content to another XML file to be picked up by SystemC. The XML should look like this:
<Root>
<SystemA>data for system A here </SystemA>
<SystemB>data for system B here </SystemB>
</Root>
The problem is that if I unmarshal the original XML file created by SystemA, then I cannot just call the set methods to populate SystemB data as I get a null exception. One alternative is for SystemB and SystemC to regenerate the whole file using ObjectFactory - easy in this example but much more difficult in a real example.
Hope this makes sense.
Geoff Bawn
Phone (0191) 203-5864
E-Mail Geoff.Bawn_at_PPA.NHS.UK
Fax (0191) 203-5264
>>> malachi_at_eoti.org 13:42:20 26 August 2003 >>>
Perhaps I am missing something. You want optional tags, but you don't want to know whether they were provided?
IE, if your XML file looks like:
<myRoot>
<optionalTag/>
</myRoot>
and another looks like:
<myRoot/>
you don't want to know the difference?
Malachi
On Tue, 26 Aug 2003 08:15:12 +0100, Geoff Bawn <Geoff.Bawn_at_PPA.NHS.UK>
wrote:
> 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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