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Consider trying SimpleNativeJdbcExtractor instead of implementing your custom NativeJdbcExtractor class.

Spring implementation for OracleLOBHandler considers SimpleNativeJdbcExtractor as a choice...

Follow the GenericDAO pattern which can implement your DB operations in a centralized place not only for CRUD but also for executing Stored Procs and Functions.

You can use Hibernate or any of the...

Business Layer can contain business service classes which implement well-defined business interfaces. Eg: taking the standard ATM usecase, we can design a ATMService which has service api's like...

I suggest these books:

"Pro Spring" by Rob Harrop
"Professional Java Development with the Spring Framework" by Rod Johnson

Both are great for start-up or for reference.