java - spring boot编译找不到符号componentscan

Question

我在我的小型 spring boot 项目中遇到 connot find symbol component 扫描错误。知道我哪里出错了。

基类:

@ComponentScan("com.example.test.lambda")
@SpringBootApplication
public class Application extends SpringBootServletInitializer {

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

配置类

@Configuration
@EnableWebMvc
@Profile("lambda")
public class Config {

    
    @Bean
    public HandlerMapping handlerMapping() {
        return new RequestMappingHandlerMapping();
    }

    
    @Bean
    public HandlerAdapter handlerAdapter() {
        return new RequestMappingHandlerAdapter();
    }

    
    @Bean
    public HandlerExceptionResolver handlerExceptionResolver() {
        return new HandlerExceptionResolver() {

            @Override
            public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
                return null;
            }
        };
    }

}

依赖树:

它显示 spring 上下文类已经加载..

+- org.springframework:spring-context:jar:4.3.13.RELEASE:compile
[INFO] |  +- org.springframework:spring-aop:jar:4.3.13.RELEASE:compile
[INFO] |  +- org.springframework:spring-beans:jar:4.3.13.RELEASE:compile
[INFO] |  \- org.springframework:spring-expression:jar:4.3.13.RELEASE:compile
[INFO] +- org.springframework:spring-core:jar:4.3.13.RELEASE:compile

错误:

Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project spring-boot-lambda: Compilation failure
[ERROR] spring-boot-lambda-test-jenkins/lambda-service/spring-boot-lambda/src/main/java/com/example/test/lambda/Application.java:[7,2] cannot find symbol
[ERROR]   symbol: class ComponentScan

Answer 1

这是一个多余的声明...SpringBootApplication 还为您提供了一个 componentScan...如果您真的想使用@ComponentScan，请将您的@SpringBootApplication 更改为更小的东西，例如@Configuration...

但是这样做你会失去 Springboot 提供的所有自动配置。

Springboot configuration annotation explanation

更新

我已经克隆了你的 repo，它构建得很好，除了你的类配置之外没有任何改变

Maven build succesfully

import org.springframework.boot.SpringApplication;
import org.springframework.boot.web.support.SpringBootServletInitializer;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@ComponentScan
public class Application extends SpringBootServletInitializer {

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