I can't create my custom spring-boot starter

Question

I try to create spring-boot-starter. I create a simple spring-boot module with this Gradle file:

plugins {
    id 'org.springframework.boot' version '2.1.3.RELEASE'
    id 'java'
}

apply plugin: 'io.spring.dependency-management'

group = 'my.domain'
version = '0.0.1-SNAPSHOT'

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter'
    compileOnly 'org.projectlombok:lombok'
    annotationProcessor 'org.projectlombok:lombok'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'

    annotationProcessor "org.springframework.boot:spring-boot-autoconfigure-processor"
}

And one class:

@SpringBootApplication
public class ApiSpringBootStarterApplication {

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

}

It builds successfully. But if I delete ApiSpringBootStarterApplication class I get an error:

* What went wrong:
Execution failed for task ':api-spring-boot-starter:bootJar'.
> Main class name has not been configured and it could not be resolved

If this is a starter then don't apply the Spring Boot plugin. That plugin is only ment for packaging spring boot applications. Your starter generally doesn't contain code but only dependencies and thus a `pom.xml` and/or gradle dependency information. — M. Deinum, Apr 09 '19 at 08:31
Why would you like to remove ApiSpringBootStarterApplication? This class is the entry point for this application and it is required. — MariuszS, Apr 09 '19 at 11:17
@ MariuszS because I create `spring-boot-starter`. I solved this problem, I create just gradle module instead spring-boot application — ip696, Apr 09 '19 at 11:22

amseager · Answer 1 · 2019-04-09T08:42:35.397

0

Remove org.springframework.boot from plugins. This plugin is aimed to build executable jar for your project. In case of starter you don't need to do this.

Ref: https://docs.spring.io/spring-boot/docs/current/gradle-plugin/reference/html/

By analogy, the same would be if you were using maven and spring-boot-maven-plugin.

edited Apr 09 '19 at 08:42

answered Apr 09 '19 at 08:37

amseager

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score -2 · Answer 2 · answered Apr 09 '19 at 08:29

-2

The JVM searching for the main class for start the application without the main class you can't start the application.

Why are you deleted the ApiSpringBootStarterApplication ? Is your main class.

answered Apr 09 '19 at 08:29

MarS

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2
9

1

This has nothing to do with the JVM, but with how the Spring Boot Plugin works. – M. Deinum Apr 09 '19 at 08:30

I can't create my custom spring-boot starter

2 Answers2