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Approach for Generic and Reusable Client for webservices

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Hello Team,
Since a long time, i posted to this forum, We have one design issue in our application

1. Our application has to interface with third party webservices for a functionality [ lets say find Employee details]
2. WSDL is shared

Before going for the approach, we would like to see if we can build a generic solution
Option 1
going for Wsdl2 java stub based approach, but if schema of WSDL changes, we need to regenerate, recompile
Option 2
Going for the xml construction and use Saaj Api wrap the xml with soap
Option 3
Going for the java to xml - Jaxb and attach the SOAP + XML generated from JAXB
Option 4
is there any middleware approch to be gone

a. We should have very limited change, even wsdl changes
b. Efficient way to maintain the code oop way

Kindly suggest what design pattrerns to use

a. Jboss 4.2

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