Java Spring在基本Spring启动应用程序中找不到bean
我是Spring Boot新手,将应用程序与DemoApplication(主类)和CodeChallenge类放在一起。这两个类都在同一个文件夹中。我将CodeChallenge类自动连接到主类中,并使用Java Spring在基本Spring启动应用程序中找不到bean,java,spring,spring-boot,Java,Spring,Spring Boot,我是Spring Boot新手,将应用程序与DemoApplication(主类)和CodeChallenge类放在一起。这两个类都在同一个文件夹中。我将CodeChallenge类自动连接到主类中,并使用@EventListener(ApplicationReadyEvent.class)以便在编译时触发该类。但是,每当我编译应用程序时,都会出现以下错误: Field codechallenge in com.example.demo.DemoApplication required a be
@EventListener(ApplicationReadyEvent.class)
以便在编译时触发该类。但是,每当我编译应用程序时,都会出现以下错误:
Field codechallenge in com.example.demo.DemoApplication required a bean of
type 'com.example.demo.CodeChallenge' that could not be found.
如何成功配置此应用程序,以便在编译程序时避免此错误并运行CodeChallenge类和testMethod
DemoApplication类是:
package com.example.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.context.event.EventListener;
@SpringBootApplication
public class DemoApplication {
@Autowired
private CodeChallenge codechallenge;
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
@EventListener(ApplicationReadyEvent.class)
public void callTestMethod() {
codechallenge.testMethod();
}
}
package com.example.demo;
public class CodeChallenge {
public void testMethod() {
System.out.println("hello world");
}
}
CodeChallenge类是:
package com.example.demo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.context.event.EventListener;
@SpringBootApplication
public class DemoApplication {
@Autowired
private CodeChallenge codechallenge;
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
@EventListener(ApplicationReadyEvent.class)
public void callTestMethod() {
codechallenge.testMethod();
}
}
package com.example.demo;
public class CodeChallenge {
public void testMethod() {
System.out.println("hello world");
}
}
您必须在
公共类CodeChallenge
上添加@Service
或@Component
注释,让Spring知道这是一个bean
@Service
public class CodeChallenge {
public void testMethod() {
System.out.println("hello world");
}
}
您必须在
公共类CodeChallenge
上添加@Service
或@Component
注释,让Spring知道这是一个bean
@Service
public class CodeChallenge {
public void testMethod() {
System.out.println("hello world");
}
}