原因: java.lang.ClassNotFoundException: DemoApplication

Question

我从https://start.srping.io创建了一个新的Spring应用程序

我的build.gradle

plugins {
    id 'java'
    id 'org.springframework.boot' version '2.7.5'
    id 'io.spring.dependency-management' version '1.0.15.RELEASE'
}

group = 'com.example'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '19'

repositories {
    mavenCentral()
}

dependencies {
    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
    implementation 'org.springframework.boot:spring-boot-starter-security'
    implementation 'org.springframework.boot:spring-boot-starter-web'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'
    testImplementation 'org.springframework.security:spring-security-test'
}

tasks.named('test') {
    useJUnitPlatform()
}

文件DemoApplication.java

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoApplication {

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

}

​

我按下按钮运行，程序出错。怎么修呢？

Answer 1

看起来像build.gradle文件中提到的项目依赖关系没有正确下载，因为我也可以看到一些编译错误。

请运行此命令，然后再试一次。

gradle build