The document discusses the evolution of the Spring Framework from version 5.0. It notes that Spring provides a comprehensive programming model for modern Java applications by handling technical plumbing and allowing developers to focus on business logic. It was introduced to simplify developing Java EE applications compared to Enterprise JavaBeans which had issues like being cumbersome to test, deploy, and handle exceptions. Key benefits of Spring include simplified unit testing through dependency injection, architectural flexibility, and reduction of boilerplate code. It also helps applications keep up with changing technologies through new projects and features.

1. said.sadik.fsb@gmail.com
Mastering Spring 5.0

2. Evolution to Spring Framework 5.0

3. SAIDSADIK–said.sadik.fsb@gmail.com
Spring Framework
“The Spring Framework provides a comprehensive
programming and configuration model for modern
Java-based enterprise applications”
Used to wire enterprise Java applications,
Take care of all the technical plumbing that is needed in order
to connect the different parts of an application,
Allows programmers to focus on the crux of their jobs--writing
business logic

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Problems with EJB
Developing and deploying EJBs was a cumbersome process
Difficult to unit test. Actually, difficult to test outside the EJB
Container.
Multiple interfaces need to be implemented with a number of
unnecessary methods.
Cumbersome and tedious exception handling.
Inconvenient deployment descriptors.
Spring Framework was introduced as a lightweight framework
aimed at making developing Java EE applications simpler.

5. SAIDSADIK–said.sadik.fsb@gmail.com
Why is Spring Framework popular?
Simplified unit
testing
Architectural
flexibility
Reduction in
plumbing code
Keeping up with
changing times

6. SAIDSADIK–said.sadik.fsb@gmail.com
Simplified unit testing
Spring Framework brought in the concept of Dependency
Injection (DI).
The dependency injection enables unit testing by making it easy
to replace the dependencies with their mocks. We do not need to
deploy the entire application to unit test it.
Programmers are more productive.
Defects are found earlier so they are less costly to fix.
Applications have automated unit tests, which can run in
Continuous Integration builds, preventing future defects.

7. SAIDSADIK–said.sadik.fsb@gmail.com
Reduction in plumbing code
Before Spring Framework, typical J2EE (or Java EE, as it is called now)
applications contained a lot of plumbing code.
With Spring Framework, the same logic can be applied in a couple of
lines:

8. SAIDSADIK–said.sadik.fsb@gmail.com
Keep up with changing times
Spring came up with new Cloud-oriented Spring Projects.
Spring Cloud helps in simplifying the development and
deployment of microservices.
Spring Batch defines a new approach to
building Java Batch applications.
Spring Framework introduced a number
of abstractions ahead of Java EE to keep
the application decoupled from specific
implementation. Caching API provides a
case in point.
Annotations were introduced in Java 5. Spring Framework
was ahead of Java EE in introducing an annotation-based
controller model for Spring MVC.
2004

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