README.md

Generate Project

Go to: start.spring.io and Generate Project

pom.xml

Application Class

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication // ~ @Configuaretion + @EnableAutoConfiguration + @ComponentScan ()
public class Application {

	public static void main(String[] args) {
	
		SpringApplication.run(Application.class, args);
		
		//System.out.println("Spring Boot Web MVC Started...");
	}
}

application.properties

Go to: src/main/resources > application.properties
Add:

spring.mvc.view.prefix=/WEB-INF/views/
spring.mvc.view.suffix=.jsp

Controller

• Create controller package
• Create controller

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/test")
public class TestController {

	
	@GetMapping("/")
	public String dsiplayTestPage(Model model) {
		
		model.addAttribute("tm", "Test Message");
		
		return "test";
	}
}

Run Configuration

Create Run Configuration:
Name: Mvn Spring Boot Run
Goals: spring-boot:run

Alternative:
Right click on project > Run As > Spring Boot App

Cleaning
Name: Mvn Clean
Goals: clean

Single Assembly Build

Edit Pom:    
 <build>
  <plugins>
    <plugin>
      <artifactId>maven-assembly-plugin</artifactId>
      <configuration>
        <archive>
          <manifest>
            <mainClass>com.thanga.[REPLACE WITH YOUR MAIN CLASS]</mainClass>
          </manifest>
        </archive>
        <descriptorRefs>
          <descriptorRef>jar-with-dependencies</descriptorRef>
        </descriptorRefs>
      </configuration>
    </plugin>
  </plugins>
</build>

Create Run Configuration
Name: Pack As Single Assembly
Goals: package assembly:single

Run (Maven will create two jars - app.jar & depedency.jar)

NB: requires internet connection to download dependencies

Offline Maven Build

Offline Build Method 1

• mvn dependency:go-offline command will download everything that your project depends on and will make sure that on a later build, nothing will be downloaded. Then, you can simply make a ZIP of {user.home}/.m2/repository.
• unzip inside offline machine {user.home}/.m2/repository (will be able to build the project)

Offline Build Method 2

• Get the dependency.jar from "Single Assembly Build" described above
• Maven command to deploy to offline machine: mvn install:install-file -Dfile=<path-to-file>

Local Repo

Thymeleaf instead of JSP

Remove following from application.properties

spring.mvc.view.prefix=/WEB-INF/views/
spring.mvc.view.suffix=.jsp

Jasper dependency is also not needed

<dependency>
	<groupId>org.apache.tomcat.embed</groupId>
	<artifactId>tomcat-embed-jasper</artifactId>
	<scope>provided</scope>
</dependency>

To use thymeleaf template engine instead of JSP & JSLT, add dependency

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

By default thymeleaf will look in src/main/resources/templates with .html files (jar deploy)
To deploy as war change default configuration in application.properties

spring.thymeleaf.presfix= /WEB-INF/views/
pring.thymeleaf.suffix= .html

Hot Swapping / Reloading

Add spring-boot-devtools dependency

<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-devtools</artifactId>
	<optional>true</optional>
</dependency>

Open application.properties set thymeleaf cache to false

spring.thymeleaf.cache= false

DevTools Details

Thymeleaf master page

Model binding

Getting & setting session value

Custom Error Page

Controller Advice to Handle Exception & Error

Ajax Call

Configuration Properties and Message

Logging with SLF4J and Logback