sorry for causing confusion. You were right, XMLFileDescriptorsStore is *not* available in Slide 1.0.16! It is in the CVS for 2.0 though. Judging from my expericene 2.0 has better support than 1.x now and is pretty stable. However, I could not find any evidence for an official approach to make it a release soon. So, if you used it there would be even less (even though there also is non for 1.0.16 either) guaranty that everything works well.
In comparison with the JDBC stuff XMLFileDescriptorsStore probably has some drawbacks. The two most obvious might be speed (altough I am not quite sure about this, need to look at the implementation) and lack of transactional control. I.e. in case of error you might get some XML descriptor files half written or one written and one missing...
As to MemoryDescriptorsStore: I guess it is there for demonstration purposes only. As XMLFileDescriptorsStore moved in only after 1.x it seems there was no decent out-of-the-box descriptors store (at least not with versioning).
Unfortunately, I can not help you with your exception as I have no experience with 1.0.16. :(
Oliver
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