Creating a spring boot application in Gradle

  • Create a empty directory first.
  • Navigate to the directory and run the command gradle init –type java-application

Contents of the directory are :

Now edit the contents of build.gradle as per below :

plugins {
    id 'java'
    id 'org.springframework.boot' version '2.0.5.RELEASE'
    id 'io.spring.dependency-management' version '1.0.7.RELEASE'
}

repositories {
    jcenter()
}

dependencies {
    implementation 'com.google.guava:guava:28.0-jre'
    testImplementation 'junit:junit:4.12'
    implementation 'org.springframework.boot:spring-boot-dependencies:2.0.5.RELEASE'
    implementation 'org.springframework.boot:spring-boot-starter-web'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'

    components {
        withModule('org.springframework:spring-beans') {
            allVariants {
                withDependencyConstraints {
                    it.findAll { it.name == 'snakeyaml' }.each { it.version { strictly '1.19' } }
                }
            }
        }
    }
}

bootJar {
    mainClassName = 'GradleDemo.App'
}

task runJar{
	dependsOn 'assemble'
	dependsOn 'jar'
	doLast{
  		javaexec { 
    		main="-jar";
    		args = [
            	"build/libs/"+rootProject.name+".jar"
           	]
		} 
	}
}

App.java as per below

/*
 * This Java source file was generated by the Gradle 'init' task.
 */
package GradleDemo;

import org.springframework.boot.SpringApplication;

@SpringBootApplication
public class App {

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

}

HelloGradleController.java parallel to App.java like below :

package GradleDemo;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController("/")
public class HelloGradleController {

    @GetMapping
    public String helloGradle() {
        return "Hello Gradle!";
    }

}

AppTest.java like below :

/*
 * This Java source file was generated by the Gradle 'init' task.
 */
package GradleDemo;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.test.web.servlet.MockMvc;

import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;

@RunWith(SpringRunner.class)
@SpringBootTest(classes = App.class)
@AutoConfigureMockMvc
public class AppTest {

    @Autowired
    private MockMvc mvc;

    @Test
    public void helloGradle() throws Exception {
        mvc.perform(get("/"))
            .andExpect(status().isOk())
            .andExpect(content().string("Hello Gradle!"));
    }

}

Now run the task runJar in command prompt

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