About Spring
What is Spring:
The Spring Framework is one of the most popular open source application development frameworks for Java.
One of the best features in Spring is that it has the Dependency Injection (DI) or Inversion Of Control (IOC).
which allows us to develop loosely coupled applications. And, loosely coupled applications can be easily unit-tested.
Spring Modules:
Spring Framework is enrich with several modules, its categorized approx 22 modules to cater many common problems.
some of the popular modules are –
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Spring JDBC
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Spring MVC
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Spring AOP
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Spring ORM
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Spring JMS
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Spring Test
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Spring Expression Language (SpEL)
Why Do We Need Spring Boot?
Problem faced to build an end to end enterprise application in Spring Framework –
· It takes
a lot of time for a developer to set up a basic project using Spring MVC with
minimum functionality.
· There was
lot of difficulty to setup Hibernate Datasource, Entity Manager,
Session Factory, and Transaction Management.
· How
do you package and deploy this application to your web server.
· With
Spring MVC you have to manually write the configurations, XML files, etc.
for deploying to web server.
· Whole
application is build and deployed on application server as one entity.
· Its
difficult to manage, scale and maintain the application.
· Issue
in one module of an application will impact to entire application.
What is Spring Boot and how Does Spring Boot Solve This Problem?
Spring Boot is basically an extension of the Spring framework which eliminated the boilerplate configurations required for setting up a Spring application.
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It takes an opinionated view of the Spring
platform which paved the way for a faster and more efficient development
eco-system.
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Spring Boot use AutoConfiguration, it will take
care of all the internal dependencies that your application needs.
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Spring Boot will auto-configure with the
Dispatcher Servlet, if Spring jar is in
the class path.
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It will auto-configue to the datasource, if
Hibernate jar is in the class path.
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Spring Boot gives us a pre-configured set
of Starter Projects to be added as a
dependency in our project.
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Spring boot works with opinionated ‘starter’
dependencies to simplify build and application configuration
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It takes Zero XML configuration in your project,
you don't need deployment descriptor, web server, etc.
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Spring Boot is magical framework that bundles
all the dependencies for you.
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It has embedded server to avoid complexity in
application deployment, your web application will be a standalone JAR file with
this embeded servers.
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One fat application can be break into separate
independent application(s), each one can be develop/manage/maintain and scale
independently.
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Other than this it has Metrics, Helth check, and
externalized configuration,automatic config for Spring functionality – whenever
possible
Starter dependencies
Spring Boot provides a number of starter dependencies for
different Spring modules. Some of the most commonly used ones are: –
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spring-boot-starter-web-services: SOAP Web
Services
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spring-boot-starter-web: Web and RESTful
applications
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spring-boot-starter-test: Unit testing and
Integration Testing
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spring-boot-starter-data-jpa: Spring Data JPA
with Hibernate
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spring-boot-starter-jdbc: Traditional JDBC
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spring-boot-starter-data-rest: Expose Simple
REST Services using Spring Data REST
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spring-boot-starter-security: Authentication and
Authorization using Spring Security
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spring-boot-starter-cache: Enabling Spring
Framework’s caching support
