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You create a proxy which implements MaterialDaoLocal (well the lookup does that) and you expect to convert it to a concrete implementation (MaterialDaoBean) because it is a dynamic proxy that isn't...

Wanted to invoke service object from Spring webflow Action class, since the service objects on EJB container, not sure how to autowire the service in Web layer

I suggest the search as it seems you are making the classic error of trying to convert a proxy to a concrete implementation. You should program to interfaces and not concrete implementations, also...