Introduction to Spring
Introduction to Spring
Before going to know about Spring framework lets see what is “Framework”. Framework is not a new technology, it is an abstraction layer on the top of existing technologies.
Developing Projects by using Java and JavaEE APIs increases burden on the programmer because we have so many packages with so many classes and interfaces. To reduce the Burden on programmers Third party vendors started providing layers on top of this existing technologies. These layers are nothing but framework. So we can say that Spring framework is an abstraction layer on the top of JavaEE technology.
Why Spring Framework?
When Java was introduced to the market, industry developers were using Java for developing gaming application because of applet. Actually SUN Microsystem provided Java for Business Layer. So in 1996 Java bean Specification was released to develop business logic. With the Java Beans Business Logics are developed but services can not be added like transaction and security etc. In 1998, SUN Microsystem released EJB technology, in which programmers develop business logic and services are added by EJB container. Industry developers was unsatisfied with EJB because multiple files are required to develop an application. As an alternative for EJB, Spring framework was introduced. Spring framework says that write business logic in POJO classes and services will be provided by spring container. Spring framework was first introduced to developed business layer. It has enhanced for Presentation layer and Data access layer as well. Today we use Spring framework in industry to develop Presentation and Business layer.
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