运行简单的Rest Java hello world程序

Question

I am trying to run a simple Rest HelloWorld program as described in https://spring.io/guides/gs/rest-service/ . I have downloaded Spring and Maven and added the MAVEN_HOME and M3_HOME environment variables. I have run the mvn -v command successfully in Windows command prompt. I browsed to the initial directory where the pom.xml is located. Then I run mvn spring-root:run but I get the following error:

No plugin found for prefix 'spring-boot' in the current project and in the plugin groups [org.apache.maven.plugins, org.codehaus.mojo] available from the repositories [local (C:\\Users\\user.m2\\repository), central ( https://repo.maven.apache.org/maven2)] -> [Help 1]

I have already searched for this error message on the internet but the suggestions are not solving my problem. Am I forgetting something related to any installation? Any idea or suggestion is highly appreciated.

Answer 1

Oh, I realized now I had same issue in the past...

To address

[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:1.5.9.RELEASE:repackage (default) on project gs-rest-service: Execution default of goal org.springframework.boot:spring-boot-maven-plugin:1.5.9.RELEASE:repackage failed: Unable to find main class -> [Help 1]

You have to create Application class (something annotated with @SpringBootApplication )

@SpringBootApplication
public class Application {

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

or skip tests mvn clean install -DskipTests .

For mvnw spring-boot:run I'm getting ConnectException right now...

Downloading https://repo1.maven.org/maven2/org/apache/maven/apache-maven/3.3.9/apache-maven-3.3.9-bin.zip

Exception in thread "main" java.net.ConnectException: Connection refused: connect

but it is very likely issue on my side...