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Within a spring mvc application, is the following scope for each bean type correct?
1. service's which have properties that are Dao's be singleton?
2. Dao's that reference a data source should be per request scope.
Does this make sound sense?
No, DAOs should also be singletons. If your DAOs have state, you are doing something wrong.
If you have multiple DataSources per DAO type that’s a problem, but to me the solution is to have one singleton per datasource.