java - 异常: org. springframework.beans.factory.BeanCurrentlyInCreationException

Question

我想在抽象类上有计划注释，以便子类不需要有注释。抽象类中有类似的东西

@EnableScheduling
@SpringBootApplication
public class DemoApplication {

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

}

public abstract class AbstractTestClass {

    @Bean
    public String getDelay() {
        return "1000";
    }

    @Scheduled(fixedRateString = "#{@getDelay}")
    public void callScheduledMethod() {
        getZeroBytesFile();
    }

    public abstract void getZeroBytesFile();
}

@Component
public class ChildClass extends AbstractTestClass {

    @Override
    public String getDelay() {
        return "5000";
    }

    @Override
    public void getZeroBytesFile() {
        System.out.println("called");
    }

}

@Component
public class OtherClass {

    // This bean initialisation throws error
    @AutoWired ChildClass childClass;

}

但是它不起作用并抛出此异常

org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'getDelay': Requested bean is currently in creation: Is there an unresolvable circular reference?

任何指针都会有帮助。提前致谢

Answer 1

这是实现这一目标的技巧:

@EnableScheduling
@SpringBootApplication
public class DemoApplication {

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

}

public abstract class AbstractTestClass {

    @Bean
    public String getDelay() {
        return "1000";
    }

    @Scheduled(fixedRateString = "#{@getDelay}")
    public void callScheduledMethod() {
        getZeroBytesFile();
    }

    public abstract void getZeroBytesFile();
}

@Component
public class ChildClass extends AbstractTestClass {

    @Override
    public String getDelay() {
        return "5000";
    }

    @Override
    public void getZeroBytesFile() {
        System.out.println("called");
    }

}