Spring Boot Developer Tools and Live Reload - Maximize productivity with Hot Swapping


When we develop web applications with Java, we had to restart the server to pick up all changes. This kills productivity. Spring Boot Developers Tools provides solutions to automatically pick up changes without a complete server restart. Lets get productive with Spring Boot Developer Tools.

You will learn

  • How to use Spring Boot Developer Tools?
  • What kind of changes does Spring Boot Developer Tools pick up automatically?
  • How can you use Live Reload to be more productive?

Image

10 Step Reference Courses

Problem with Server Restarts

When we develop our applications (Web or RESTful API), we would want to be able to test our changes quickly.

Typically, in the Java world, we need to restart the server to pick up the changes.

There are plugins like JRebel which help, but you need shell out $$$ for it.

Restarting server takes about 1 to 5 minutes based on the size of the application. A typical developer does 30 - 40 restarts in a day. I leave it as an exercise to determine how much time a developer can save if the changes are automatically picked up as soon as I make a code change.

Thats where Spring Boot Developer Tools comes into picture.

Adding Spring Boot Developer Tools to Your Project

Adding Spring Boot Developer Tools to your project is very simple.

Add this dependency to your Spring Boot Project pom.xml

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-devtools</artifactId>
	<scope>runtime</scope>
</dependency>

Restart the application.

You are all Set.

Go ahead and make a simple change to your controller. You would see that these changes are automatically picked up.

What kind of changes does Spring Boot Developer Tools pick up?

By default, any entry on the classpath that points to a folder will be monitored for changes.

Here are few important things to note:

These folders will not trigger reload by default

  • /META-INF/maven
  • /META-INF/resources
  • /resources
  • /static
  • /public
  • /templates

You can configure additional folders to scan.

application.properties

spring.devtools.restart.additional-paths = /path-to-folder

You can also configure folders to exclude.

spring.devtools.restart.exclude=static/**,public/** 

Auto refresh your browser with LiveReload

Spring Boot Developer Tools auto loads the changes to application. But if you are developing a web application, you would need to refresh the browser to pickup the change.

LiveReload aims to solve this problem

LiveReload offers extensions for browsers

  • Download from http://livereload.com/extensions/

Once you install the LiveReload plugin for your browser, you would see that the page auto refreshes when you make a change in application code.

LiveReload is Technology in progress!! So, expect a few problems!

Congratulations! You are reading an article from a series of 50+ articles on Spring, Spring Boot , Hibernate, Full Stack, Cloud and Microservices. We also have 20+ projects on our Github repository. For the complete series of 50+ articles and code examples, click here.

Join 300,000 Learners!

Learn Spring Boot in 10 Steps - FREE Course

Next Steps

Image](https://www.udemy.com/full-stack-application-with-spring-boot-and-react/?couponCode=SBT-2019){:target=”_blank”}

Image

Image

Image

Image

Image

Image

Image

Image

Image

Image

Related Posts

Spring Boot Tutorials for Beginners

At in28Minutes, we are creating a number of tutorials with videos, articles & courses on Spring Boot for Beginners and Experienced Developers. This resources will help you learn and gain expertise at Spring Boot.

Spring and Spring Boot Video Tutorials for Beginners

At in28Minutes, we are creating a number of tutorials with videos, articles & courses on Spring Boot for Beginners and Experienced Developers. Here's a list of video tutorials and courses for you

What is an In Memory Database?

In this article, we understand what the term "In-Memory Database" actually means. We see what scenarios they can be used, and why they are important.

What is an Embedded Server?

In this article, we focus in exploring what an embedded server is, and how they help make application deployment simpler.

Java Tools and Frameworks - Introduction To Maven

In this article, we experience a brief introduction to Maven, and will see how it helps in managing your project dependencies.

Five Tools To Learn as a Java Developer

In this article, we introduce you to five great tools that we recommend every Java Developer to learn.

Five Languages To Learn as a Java Programmer

As a programmer, you want to explore new things. Learning a new language gives you a different perspective when solving problems. What are the 5 languages that a Java developer should explore?

Five Great Frameworks To Try for Java Programmers

As a programmer you want to explore new languages and frameworks. What would be the best frameworks to explore in 2019 for Java Programmers?

Unit Testing Best Practices - with Java and Junit Examples

Unit Testing is often underrated. As far as I am concerned, having good unit tests seperates good projects from bad. In this article, let's look at unit testing best practices in depth. We use examples from Java and JUnit to illustrate the concepts. However, the best practices are applicable irrespective of the programming language used.

Programming Basics - Unit Testing - What Is Mocking?

Mocking is an important concept that is made use of, when writing unit tests. In this article, we explore what mocking is all about, and explore some of the popular Java mocking frameworks in use.