1. 确认您的项目中已经添加了AspectJ的Maven依赖，并且在pom.xml文件中添加了以下插件和依赖项：

    
        
            org.codehaus.mojo
            aspectj-maven-plugin
            1.7
            
                
                    
                        compile
                        test-compile
                    
                
            
            
                1.8
                1.8
                1.8
            
        
    



    
        org.aspectj
        aspectjrt
        1.8.9
    
    
        org.aspectj
        aspectjweaver
        1.8.9
    

2. 在您的AspectJ示例代码中，确保已经正确引用了AspectJ库：

import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.stereotype.Component;

@Aspect
@Component
public class ExampleAspect {

    @Before("execution(* com.example.service.ExampleService.sayHello(..))")
    public void before() {
        System.out.println("Before sayHello method.");
    }
}

3. 在您的应用程序主类中，将@EnableAspectJAutoProxy注解添加到@Configuration注解中，启用AOP：

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.EnableAspectJAutoProxy;

@SpringBootApplication
@Configuration
@EnableAspectJAutoProxy
public class ExampleApplication {

    public static void main(String[] args) {
        SpringApplication.run(Example