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Basic Concepts and Components of a Project

Basic Concepts and Components of a Project

Understand the basic concepts of a project, such as autoconfiguration and component scanning.

The initial code we’ve built is given below. Let’s explore some of the other files provided to us:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.5.6</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.greglturnquist</groupId>
	<artifactId>hackingspringboot</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>hackingspringboot</name>
	<description>Demo project for Hacking with Spring Boot</description>
	<properties>
		<java.version>11</java.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-thymeleaf</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-webflux</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>io.projectreactor</groupId>
			<artifactId>reactor-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
			<plugin>
				<groupId>com.fizzed</groupId>
				<artifactId>fizzed-watcher-maven-plugin</artifactId>
				<version>1.0.6</version>
				<configuration>
					<watches>
						<watch>
							<directory>src/main</directory>
							<exclude>*.css</exclude>
							<exclude>*.js</exclude>
							<exclude>*.svg</exclude>
						</watch>
					</watches>
					<goals>
						<goal>compile</goal>
						<goal>process-classes</goal>
					</goals>
				</configuration>
			</plugin>
		</plugins>
	</build>

</project>
An empty Spring Boot project

Java application class

In addition to the build file we just looked at, the Spring Initializr provides the following application file:

@SpringBootApplication
public class HackingWithSpringBootApplication {
public static void main(String[] args) {
SpringApplication.run(HackingWithSpringBootApplication.class, args);
}
}

This class contains:

  • @SpringBootApplication: A composite annotation that introduces autoconfiguration and component scanning.

  • main(String[] args): A runnable function to launch our application.

  • SpringApplication.run(HackingSpringBootAp ...