The Spring Framework is an application framework and inversion of control container for the Java platform.It is so popular as it is light weight and open source framework.Now it is being used instead of the Enterprise Java Beans (EJB) model.it was initially created by Rod Johnson and was released under the Apache 2.0 license in June 2003.
The Spring Framework is a Java platform that provides the comprehensive infrastructure for developing Java applications very easily and quickly.Spring framework is having much demand because of the following 3 reasons….
Spring framework is simple because as it is non-invasive, POJO(Plain Old Java Object) and POJI(Plain Old Java Interface) model
Actually, for writing the spring application, server [Container] is not mandatory, but for struts applications, we need a server, and for Enterprise Java Beans too.Spring can be used to develop any kind of java application, means we can develop starting from console application to enterprise-level application
In spring objects are loosely coupled, this is the core concept of spring framework we will see in depth about this loose coupling and how its differ from tight coupling
Spring makes the application development fast and increases the productivity of developers.so, learning spring framework is much necessary in the present world.
*Spring Framework enables developers to develop enterprise-class applications using POJO.So, you do not need an EJB container but it’s optional to use Tomcat or similar heavy containers.it also provides a consistent transaction management interface that can scale down to a local transaction.
*Spring is light weight framework because of its POJO model.Lightweight IOC containers tend to be lightweight, especially when compared to EJB containers.Spring Framework made J2EE application development little easier by introducing POJO model with limited memory and CPU resources.
*you can build applications from plain old Java objects(POJOs) and apply enterprise services non-invasively to POJOs which is majorly used in Java SE and in Java EE programming models.
*Spring Framework is the combination of all the industry standard framework approaches (such as Struts and Hibernate) into one bundle.it provides a convenient API to translate technology-specific exceptions (thrown by JDBC) into consistent, unchecked exceptions.
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