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AbstractMethodError is thrown when an application tries to call an abstract method. URI is an abstract method in UriBuilder, so you need an implementation of this. How to fix it : https://goo.gl/S6CPfP
It has all to do with the javax.validation api and hibernate. A probable compatibility issue. Either downgrade the included javax.validation version or upgrade your hibernate validator to 5.0.x (or the latest).
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at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)