无法在eclipse中运行Spring Boot项目

Question

我正在尝试为一个Java项目学习eclipse。我使用初始化器(https://start.spring.io/)使用Spring web的依赖项来设置spring Boot。我尝试在eclipse中构建我的项目，得到以下错误

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v2.5.2)


2021-07-05 12:20:50.248  INFO 23536 --- [           main] o.s.boot.SpringApplication               : Starting SpringApplication v2.5.2 using Java 11.0.2 on MSI with PID 23536 (C:\Users\user\.m2\repository\org\springframework\boot\spring-boot\2.5.2\spring-boot-2.5.2.jar started by user in C:\Users\user\Downloads\app)
2021-07-05 12:20:50.252  INFO 23536 --- [           main] o.s.boot.SpringApplication               : No active profile set, falling back to default profiles: default
2021-07-05 12:20:50.445 ERROR 23536 --- [           main] o.s.boot.SpringApplication               : Application run failed

java.lang.IllegalArgumentException: Sources must not be empty
    at org.springframework.util.Assert.notEmpty(Assert.java:470) ~[spring-core-5.3.8.jar:5.3.8]
    at org.springframework.boot.SpringApplication.prepareContext(SpringApplication.java:425) ~[spring-boot-2.5.2.jar:2.5.2]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:337) ~[spring-boot-2.5.2.jar:2.5.2]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) ~[spring-boot-2.5.2.jar:2.5.2]
    at org.springframework.boot.SpringApplication.main(SpringApplication.java:1359) ~[spring-boot-2.5.2.jar:2.5.2]

有什么想法吗？

Answer 1

也许你上错了课。运行使用@SpringBootApplication注释的类

Answer 2

当没有提供源(Class<?>...)时，在SpringApplication (从2.5.2版开始)中会抛出这个确切的异常和堆栈跟踪。当直接调用或使用SpringApplicationBuilder调用时，就会发生这种情况：

public static void main(String[] args) {
    new SpringApplicationBuilder()
            .registerShutdownHook(true)
            .run(args);
}
// or
public static void main(String[] args) {
    new SpringApplication().run(args);
}

要解决此问题，请将您的类传递给构建器(例如DemoApplication.class)，如下所示：

public static void main(String[] args) {
    new SpringApplicationBuilder(DemoApplication.class)
            .registerShutdownHook(true)
            .run(args);
}
// or
public static void main(String[] args) {
    new SpringApplication(DemoApplication.class).run(args);
}

另一种选择是使用静态帮助器方法运行应用程序，如下所示：

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