SPRING BOOT IN JAVA

 SPRING BOOT 

• WHAT IS SPRING BOOT
• ADVANTAGES OF SPRING BOOT 
• LIMITATIONS OF SPRING BOOT 
• SPRING BOOT PREREQUISITE 
• APPLICATION EVENT AND LISTENERS 

You will learn the fundamentals of the Spring Framework with this Spring Boot blog. Our 

Spring Boot blog may be useful for everyone, from total beginners to seasoned experts.
The Spring framework's RAD features are enabled by the Spring Boot module.
Our extensive Spring Boot course covers functions, projects, Maven, beginning project 
wizard, Spring Initializer, command line interface, applications, annotations, dependency 
management, properties, initializers, executor, JPA, JDBC, and more.

What is a spring boot? 

Among these projects, Spring Boot is based on the Spring Framework. Simple and web-
based programs may be installed, configured, and run with ease.
This Spring module enhances the Spring Framework with the ability to do Rapid Application 
Development (RAD). Creating standalone Spring-based apps is a breeze with its minimal 
Spring setup needed.
Spring Boot: how does it function? All things considered, Spring Boot is the offspring of 
Spring Framework and Embedded Servers.
With Spring Boot, you won't need to worry about XML configuration (deployment descriptor). 
By following the concept of convention rather than configuration in software architecture, it 
lessens the workload of developers.
Using Spring Initializer or the Spring STS IDE, you may create Spring Boot Java applications.
Why should we use Spring Boot Framework?
We ought to embrace the dependency injection technique since Spring Boot employs it.
It can easily handle database transactions because of its extensive features.
It is simpler to connect to other Java frameworks, such as JPA/Hibernate ORM, Struts, and others.
The application's development time and cost are both reduced.
A large number of other Spring sister projects, including the Spring Boot Framework, aid in
the creation of applications that satisfy the needs of modern enterprises. The sister projects 
listed below are scheduled for release in the spring:
Making Use of Spring Data Its simplified data access is advantageous for both relational and
NoSQL databases.
A powerful batch processing framework is Spring Batch.
Spring Security is a security framework that is used to provide robust protection for apps.
LinkedIn and other social networking sites may be integrated using the Spring Social 
framework.
Programs like Spring Integration make use of enterprise integration patterns. Small message 

and notification adapters make it simple to integrate with other corporate applications

Advantages of spring boot 

It produces Java jar files that may be used to run Spring apps on their own.
It tests web applications with ease using built-in HTTP servers such as Tomcat, Jetty, etc. We 
don't need to distribute WAR files.
It provides "initial POMs" that are fictitious and are meant to make Maven setup easier.
They are production-ready because they provide features like metrics, health checks, and 
external configuration.
XML does not require configuration.
The Spring Boot application may be built and tested using the command line interface (CLI) 
that is supplied.
It offers several more features.
It also lessens the need to create a great deal of generic code (i.e., code that has to be used 
everywhere with little modification) and XML definitions and annotations.
There is an increase in productivity. accelerate the process of development.

Limitations of Spring Boot

It's possible that the dependencies that Spring Boot uses are inappropriate for the application.
It means that the dependencies increase the size of the program.

Goals of Spring Boot

The primary goal of Spring Boot is to reduce the amount of time spent on development, unit 

testing, and integration testing.

provides a growth-oriented philosophical framework.

Don't be specific. further explanation of annotations

Replace fewer statements about imports.

Avoid interacting with the XML settings.

The characteristics that the Spring Boot Framework delivers or avoids result in less development 

effort, less developer effort, and more productivity.

Spring Boot Prerequisite

These steps must be followed to create a Spring Boot application. This course will 
make use of the Spring Tool Suite, or (STS) IDE.
Java 1.8Maven 3.0+Spring Framework 5.0.0.BUILD-SNAPSHOTIDE (Spring Tool Suite) is
recommended.
Spring Boot features
Web – Development
Spring-Application
Application Events and Listeners
Management Features
Exported Settings
Exported Files
YAML Support
Type-Safe Configuration
Writing
Security
Web Development
Build excellent web apps using this spring module. A standalone HTTP application may be 
easily created using pre-installed servers like Undertow, Tomcat, or Jetty. It is possible to 
utilize the spring-boot-starter-web web module to accelerate the program's startup.

Spring-Application

Using the Spring Application class is a simple way to invoke Spring Application. It is possible 
to start with the base technique. The static run() method is the only way we have to start the 
application.

Application Events and Listeners

Events are a useful tool that Spring Boot uses to carry out various tasks. With this approach, 
we can now create a factory file for adding listeners. We may access it via the Application Listener 
key.
Always create a factory file in the META-INF directory (e.g. META-INF/spring. Factories).

Admin support

Spring Boot allows you to enable administrator-related features for the application. Its main 
applications are in remote access and application management. To achieve that, we may use 
the "spring.application.admin.enabled" attribute in Spring Boot.

External Configuration

By removing the setup using Spring Boot, we may run the same application in several contexts. 
YAML files are used by the software to exclude configuration parameters.

Application Files

Spring Boot offers a wide range of functionality for applications. It may be included in the 
properties file for our project. A lot of attributes are defined in the properties file, such server
-port=8082. With its help, application features are arranged more efficiently.

YAML support

With its assistance, a hierarchical configuration may be established easily. This is a superset 
of JSON. Native support for Yaml is provided via the Spring Application class. Here, there 
are more options than using a properties file.

Type-safe configuration

Strongly type-safe configuration is intended for use in application administration and validation.
Configuring an application is always a crucial and secure task. We also have access to the 
annotations that are included with this library.

Logging

All internal protocols of Spring Boot follow the same convention. Registry dependencies are 
managed by the default option. It is not allowed to change protocol dependencies unless 
customization is required.

Security

We call this web application framework Spring Boot. Consequently, basic authentication is 
automatically applied to all HTTP endpoints. The plethora of readily available endpoints makes 
it simple to build a secure Spring Boot application.

Prerequisite

You must have a basic understanding of the Spring Framework before learning Spring Boot.

Audience

Our Spring Boot tutorials are designed to help beginners and professionals.  

Problem

We promise that you won't be disappointed with the Spring Boot Tutorial. However, please 
use the contact form to let us know about any errors you see.

SPRING IN JAVA

 SPRING

• WHAT IS SPRING 
• ADVANTAGES 
• APPLICATIONS

A basic overview of the Spring framework is shown with examples. Rod Johnson invented it in 2003. 

The Spring framework makes it easy to construct JavaEE applications.

Spring Framework 

A free-floating spring is the shape. It appears to be a framework of frameworks since it 

supports several other frameworks, such as Struts, Hibernate, Tapestry, EJB, JSF, and more. 

Another way 

to look at it as a framework that we may use to tackle various technological problems.

Numerous modules for IOC, AOP, DAO, Context, ORM, WEB MVC, and many more topics are included 

in the Spring framework. We shall learn about these courses on the next page. Let's first 

review dependency injection and IOC.

Why to use spring?

The Spring framework is an example of an open-source Java platform. In June 2003, Rod Johnson 
first publicly released it under the Apache 2.0 license. Spring is a featherweight in terms of viscosity 
and volume. The typical Spring Framework installation takes up around 2 MB of space. The Java EE 
platform may be used to construct web apps with the Spring Framework, but any Java program can 
be created by leveraging its basic features. The POJO-based programming paradigm provided by the 
Spring framework encourages excellent programming practices and facilitates J2EE development.

Inversion of control (IOC) and dependency injection 

By removing dependencies, these design principles aim to simplify programming. They facilitate code 
maintenance and testing. We shall understand this with the aid of the following code.

Here, the place and the employee are closely related to one another. In a scenario involving reverse 
control, we arrive at this.

As a result, the IOC only applies the code rigorously. We won't have to deal with the code 

when we apply our logic in a new setting.
It is the IOC container's responsibility to install the dependency in the Spring framework. 
We contribute metadata to the IOC repository in two formats: annotations and XML files.
Dependency injection benefits include:
makes code easily testable 
loosely linked for easier maintenance.

Advantages of spring framework 

Spring Framework has many advantages. They are as follows:

1)      Predefined templates

Spring provides templates for several technologies, including JDBC, Hibernate, JPA, and 
others. Having said that, a ton of code is unnecessary. hiding these technologies 
underlying mechanisms.
Take the Jdbc Template for example. There is no need to write code to handle exceptions, 
create a connection, create an expression, bind an event, close a connection, etc. To 
execute the query, all we have to do is write code. Therefore, it saves a ton of JDBC 
code.

2)      Loose coupling

        Dependency injection makes Spring apps loosely connected.

3)      Easy to test

Dependency injection makes testing applications easier. Spring apps don't need servers
to run, in contrast to Struts and Enterprise JavaBeans (EJB) applications.

4)      Lightweight

The lightweight framework's low weight is a result of the POJO implementation. The 
Spring Framework does not require the implementation of interfaces or class 
inheritance. That explains why its name is non-intrusive.

5)      Fast development

Spring
The framework's dependency injection and multi-framework support make it easy to
develop JavaEE applications.

6)      Powerful abstraction

Strong abstraction is offered for JavaEE standards, including JMS, JDBC, JPA, and JTA.

7)      Declarative support

For caching, validation, events, and formatting, it offers declarative support.

Applications of spring 

POJO-based

With POJO applications and Spring, developers may create enterprise-level
applications. You may forego using an EJB container as an application server if
you solely use POJOs. An alternative is to use a reliable server container like
Tomcat or any other commercial program.

Modular

Spring is installed modularly. Even with many packages and classes, you only need to
care about what you need and ignore the others.

Integrate with existing frameworks

Rather than building from the ground up, Spring makes extensive use of existing
technologies. These include several JEE, Quartz, JDK timers, logging
frameworks, object relationship management (ORM) frameworks, and other
visualization tools.

Testability

Because environment-dependent code is placed in this framework, testing the application written in 

Spring is negligible. Additionally, using JavaBean-style POJOs makes it easy to use dependency 

injection to inject test data.

Web MVC

The well-designed Spring Web Framework is a good choice as an alternative to too-complex web frameworks like Struts. This MVC framework is based on the web.
alternative web frameworks.

Central Exception Handling

With Spring's simple API, exceptions thrown by technologies such as JDBC, Hibernate,
or JDO may be simply converted into consistent unchecked exceptions.

Lightweight

One common feature of IoC containers is their lightweight nature, especially when
compared to EJB containers. This makes it simple to design and distribute
programs with low memory and CPU requirements.