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joplin notion extension/Web Development/Java/Spring/Initializing project.md Normal file
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Initializing project
https://docs.spring.io/spring-boot/tutorial/first-application/index.html
Download maven repos from https://mvnrepository.com/
1. First make sure that java and maven are installed. Gradle can be used too but maven is preferred for simplicity. check it by `java -version` and `mvn -v`.
2. Like react have `package.json` which contains structure and what is to be installed so in spring boot it is `pom.xml`. pom stands for project object model. This is pom.xml for starter.
```xml
<?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>
<groupId>com.example</groupId>
<artifactId>myproject</artifactId>
<version>0.0.1-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.3.3</version>
</parent>
<!-- Additional lines to be added here... -->
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
</project>
```
3. Then in the root folder type `mvn package` in terminal to download related maven and spring plugins. its like `npm install` of react. This will download dependencies on `~/.m2/repository`
4. Create `src/main/java/MyApplication.java` and type following
```java
// may recieve an error if not under custom package
package com.myapp
// these will be added when starting app for first time
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
// controller as C in MVC
@RestController
@SpringBootApplication
public class MyApplication {
// map to root directory
@RequestMapping("/")
String home() {
return "Hello World!";
}
public static void main(String[] args) {
// running spring application
SpringApplication.run(MyApplication.class, args);
}
}
```
5. Run `mvn spring-boot:run` in terminal to run app.
6. Finally create an executeable jar to able to distribute it as it we need to package spring and maven plugins and packages into single jar file. All they need is java installed to run it . Add following after dependencies section in `pom.xml`
```xml
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
```
7. Then type `mvn package` to create the build (executable jar) in target folder.
8. In order to run this jar file type `java -jar target/myproject-0.0.1-SNAPSHOT.jar`. In order to peek in this jar file use
`jar tvf target/myproject-0.0.1-SNAPSHOT.jar`
&nbsp;
Alternatively u can go to https://start.spring.io/ and generate your starter project too
here is one example with web dependency configured
[spring web demo.zip](../../../../_resources/spring%20web%20demo.zip)