EclipseLink MOXy provides JAXB for OSGi. The bundles are available on
the EclipseLink
Downloads page. You'll want the OSGi bundles distribution.
Note that in JAXB you can create a context passing a classloader.
This will be necessary in OSGi for the JAXB implementation to see your
domain classes. If you need any help you can post to the
eclipselink-users mailing list or on the EclipseLink newsgroup.
Hope this helps,
Shaun
林恺 wrote:
Priyanka,
I have done things like you so
I will talk about what I have done here.
I simply made a JAXB bundle myself, which include those jars I got
from the JAXB official site -- activation.jar, jaxb-api.jar,
jaxb-impl.jar and jsr173_1.0_api.jar. I put them in a bundle and export
their packages in the bundle's MANIFEST.MF Export-Package header. After
this, I got a jaxb bundle and other bundle using JAXB api should Import
these packages.
Other things are just like you. I put the model classes generated from
xsds by jaxb in a bundle. And put the marshal/unmarshall in another bundle. The marshal/unmarshall bundle imports package from
the model bundle and JAXB bundle, and then have the following code to
create a marshal/unmarshall to
serialize/deserialize the model object.
if(unmarshaller == null){
try {
JAXBContext jc = JAXBContext.newInstance(Model.class);
unmarshaller = jc.createUnmarshaller();
log.debug("create unmarshaller for Model parser");
} catch (JAXBException e) {
log.error(e.getMessage(),e);
}
}
Note that if a use I use Model.class as the argument of the JAXBContext.newInstance() method. That I have
try if I use a string -- "some.package.Model" instead, it will
cause a JAXB exception. I don't know exactly why ? But I guess it is
related with OSGi bundle's class loader.
Anyone who have other solutions?
Link
On Wed, Apr 15, 2009 at 5:49 AM, Mitra,
Priyanka <priyanka.mitra@xxxxxxxxxx>
wrote:
Hi,
I am running into classloader
issues in the equinox/osgi framework while using Jaxb. I have a jar
that contains classes generated from xsds. User class (request) is
getting created in plugin A which I need to marshal/unmarshall in
plugin B which makes a data access call to the backend and returns a
response and unmarshalls it to response user object. I ran into Linkage
errors. I know why that happens. Jaxb API looks for Jaxb service
provider and user classes in that bundle only.
I came across "DynamicJava website"
which resolves this problem. http://www.dynamicjava.org/projects/jsr-api/jaxb-osgi
I tried to download all the jars,
org.dynamicjava.jsr.jaxb_api, org.dynamicjava.jsr.jpa_api,
org.dynamicjava.jsr.stax_api, germino.jar and jaxb-impl.jar, but still
couldn’t get it to work. Has anyone tried to use DynamicJava or any
solution to get Jaxb working with osgi?
Thanx
Priyanka
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