Webservices for EJB How to go about it

HI
Here is my situation please advice me how to go about it...
I have to expose EJB as a webservices...That EJB is already packed in jar file it has nearly 20 methods or so and the application server that i need to use is weblogic....The problem is many of the methods return java.util.Map and java.util.Collection...and the contents of the all the Maps are not of the same type all the time i mean if Method1 returns Map whose key is String and Values is user defined data type (for instance dataType1)...Method2 also returns a Map whose key is a String and values is another User Defined data type(for instance dataType2)..
I tried with weblogic servicegen and WSEE 109 manually building it but that did not work out....Right now my idea is to write wrapper class which has all the 20 methods but return user defined data type(which i have to write).Internally each method will be calling the corresponding method in EJB..If this is the case for each method i have to create different User defined data type....Is this feasible or is there better way of doing it....
Thanks for sparing some time to go through my problem

This question is also posted in the BEA forums, I've replied to it here: http://forums.bea.com/bea/thread.jspa?threadID=600004366&tstart=0
-Tim West

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