How to unmarshall list tags/unbounded elements using jax-ws auto generated classes in weblogic 12c

hi
i have a need wherein i need to create/host jax-ws webservice ( starting from wsdl) and in that service translate the xml using xsl to a different structure and call another webservice hosted to another server ( non-weblogic).
so my approach is as soon as request comes to the service impl, i marshal the object to a xml then apply the required xsl transformation and then unmarshal the transformed xml to the object which can be used to trigger another webservice.
This approach works fine for the xmls without list tags/unbounded elements , however it gives marshal exception whenever the xmls has list/unbounded elements.
i am using jaxb and jax-ws generated class for marshalling and unmarshalling.
so need some help on how to deal in this scenario?
any help is appreciated

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