Spring is comprehensive and modular. Spring has a layered architecture, which means that you can choose to use any part of it in isolation, and its architecture will still be inherently stable. So you get the most value from your learning. For example, you might choose to use Spring only to simplify the use of JDBC, or to manage all business objects.
It's designed from the ground up to help you write easily testable code. Spring is an ideal framework for test-driven engineering.
Spring does not require more than one framework for your project. Spring is potentially a one-stop solution targeting most of the infrastructure associated with typical applications. It also involves things that other frameworks don't take into account.
Spring is a Java open source framework created to solve the complexity of enterprise application development and is widely used. One of the "S"s in the very popular SSH architecture in the industry refers to Spring.
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