Spring Boot – Introduction

Video Spring boot what is it

spring boot is an open source java based framework used to create a microservice. it is developed by a core team and is used to build stand-alone, production-ready spring applications. This chapter will introduce you to spring boots and familiarize you with their basic concepts.

what is a microservice?

Microservice is an architecture that allows developers to independently develop and deploy services. each running service has its own process and this achieves the lightweight model to support business applications.

advantages

micro services offers the following advantages to its developers:

  • simple implementation
  • easy scalability
  • container friendly
  • minimum configuration
  • less production time
  • what is the spring boot?

    spring boot provides a good platform for java developers to develop a stand-alone, production-grade spring application that they can just run. you can start with minimal setups without the need for a full spring setup.

    advantages

    spring boot offers the following advantages to its developers:

    • easy to understand and develop spring applications
    • increases productivity
    • reduces development time
    • goals

      The spring boot is designed with the following objectives:

      • to avoid complex xml configuration in spring
      • to develop production-ready spring applications in an easier way
      • to reduce development time and run the application independently
      • offer an easier way to get started with the app
      • why spring boot?

        You may choose the spring boot because of the features and benefits it offers as listed here −

        • provides a flexible way to configure java beans, xml configurations, and database transactions.

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          provides powerful batch processing and manages rest endpoints.

        • in spring boot, everything is configured automatically; no manual configurations are needed.

        • provides an annotation-based spring application

        • makes dependency management easy

        • includes embedded servlet container

          how does it work?

          spring boot automatically configures your application based on the dependencies you have added to the project by using the @enableautoconfiguration annotation. For example, if the mysql database is on your classpath, but you haven’t set up any database connections, spring boot automatically sets up an in-memory database.

          The entry point of the spring boot application is the class that contains the @springbootapplication annotation and the main method.

          spring boot automatically scans all components included in the project using the @componentscan annotation.

          spring starters

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          Handling dependency management is a difficult task for large projects. spring boot solves this problem by providing a set of dependencies for the convenience of developers.

          for example, if you want to use spring and jpa to access the database, it is enough if you include the spring-boot-starter-data-jpa dependency in your project.

          Note that all spring boot starters follow the same naming pattern spring-boot-starter- *, where * indicates an application type.

          examples

          Look at the following spring starters explained below for a better understanding:

          The spring snap starter actuator dependency is used to monitor and manage your application. its code is shown below −

          The spring boot initiator security dependency is used for spring security. its code is shown below −

          spring boot start web dependency is used to write rest endpoints. its code is shown below −

          spring boot thyme leaf dependency is used to create a web application. its code is shown below −

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          The spring boot startup test dependency is used to write test cases. its code is shown below −

          automatic configuration

          spring boot autoconfiguration automatically configures your spring application based on the jar dependencies you added in the project. for example, if the mysql database is on your classpath, but you haven’t configured any database connections, spring boot automatically configures an in-memory database.

          for this purpose, you should add @enableautoconfiguration annotation or @springbootapplication annotation to your main class file. then your spring boot application will be configured automatically.

          look at the following code for a better understanding −

          spring boot application

          The entry point of the spring boot application is the class that contains the @springbootapplication annotation. this class should have main method to run spring boot application. the @springbootapplication annotation includes automatic configuration, component analysis, and spring boot configuration.

          If you added the @springbootapplication annotation to the class, you do not need to add the @enableautoconfiguration, @componentscan and @springbootconfiguration annotation. the @springbootapplication annotation includes all other annotations.

          look at the following code for a better understanding −

          component scan

          The spring boot application parses all beans and package declarations when the application is initialized. you need to add @componentscan annotation to your class file to scan your added components in your project.

          look at the following code for a better understanding −

Content Creator Zaid Butt joined Silsala-e-Azeemia in 2004 as student of spirituality. Mr. Zahid Butt is an IT professional, his expertise include “Web/Graphic Designer, GUI, Visualizer and Web Developer” PH: +92-3217244554

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