Question

这让我疯了。我有以下文件，这是一个非常简单的设置。

public class MainApp {
   public static void main(String[] args) {

    //read the spring config java class
    AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext("Config.class");

    //System.out.println("Bean names: " + Arrays.toString(context.getBeanNamesForType(AccountDAO.class)));

    //get the bean from spring container
    AccountDAO accountDAO = context.getBean("accountDAO", AccountDAO.class);

    //call the business method
    accountDAO.addAccount();

    //close the spring context
    context.close();
  }
}

Config.java:

@Configuration
@ComponentScan("com.aop")
@EnableAspectJAutoProxy
public class Config {
}

LoggingAspectDemo.java:

@Aspect
@Component
public class LoggingAspectDemo {

    //this is where we add all our related advices for the logging

    //let's start with an @Before advice
    @Before("execution(public void addAccount())")
    public void beforeAddAccountAdvice() {
        System.out.println("\n=======>>>> Executing @Before advice on method addAccount() <<<<========");
    }
}



AccountDAO.java

@Component
public class AccountDAO {
    public void addAccount() {
        System.out.println(getClass() + ": Doing my Db work: Adding an account");
    }
}

每次我运行MainApp.java时，我都会得到：

Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'accountDAO' available
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:687)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1207)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:284)

所有文件都在＆＃34; com.aop＆＃34;包所以@ComponentScan应该扫描所有组件。它看起来很简单但是我无法解决问题，任何人都可以在我出错的地方帮助我吗？

Answer 1

您正在使用AnnotationConfigApplicationContext作为String参数调用"Config.class"的构造函数，但此构造函数实际上是用于调用base packages，即参数必须是包名。

由于您希望将它与Configuration类一起使用，请使用构造函数which accepts Class instance，即。

AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(Config.class);

Intellij Spring：NoSuchBeanDefinitionException：没有bean命名＆＃39; accountDAO＆＃39;可得到

1 个答案: