我试图在主应用程序中调用客户Bean来测试我的Bean设置正确（我可以看到它们正在创建），并且出现以下错误：

  

线程“主”中的异常java.lang.ClassCastException：类   com.r00107892.bank.domain.Customer无法转换为类   com.r00107892.bank.services.CustomerService   （com.r00107892.bank.domain.Customer和   com.r00107892.bank.services.CustomerService位于的未命名模块中   com.r00107892.bank.MainApp.main（MainApp.java:24）中的加载程序“ app”）

我已经检查了Customer.java，CustomerDAO.java，CustomerDAOImpl.java，CustomerService.java，CustomerServiceImpl.java，mainApp和Beanconfig.java，但找不到问题。

我更改了Beanconfig，使其不再将Customer明确命名为Bean，而是使用ComponentScan。

MainApp

sql = "SELECT * FROM ArtistDetails"
mycursor.execute(sql)
myresult = mycursor.fetchall()
for x in myresult:
    print(f"<option>{x[1]}</option>")
print("""
</select>
<br>
""")

Customer.java

@Configuration
public class MainApp {

    public static void main(String[] args) {
    AnnotationconfigApplicationContext  context= new 
AnnotationconfigApplicationContext (Beanconfig.class);

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

        CustomerService customerService = (CustomerService) context.getBean("customer");

System.out.println(customerService.getcustomerByaccountNumber('1'));

        context.close();
    }
    }

CustomerService

@Component
public class Customer{
public String name;
public int account;


public Customer() {

}

public Customer(int account,String name){

}

public String getName() {
    return name;

}

public void setName(String name) {
    this.name=name;
}

public int getaccount() {
    return account;
}

public void setaccount(int account) {
    this.account = account;
}

public void myDetails() {
    System.out.println("My name is "+ this.name);
    System.out.println("My name is" + this.account);
    }

public String toString(String name,int account) {
    String sentence = name + " " + account;
    return sentence;

}

CustomerServiceImpl

@Service
public interface CustomerService {

    Customer getcustomerByaccountNumber(int accountNumber);

}

我希望看到第1号帐户（已经在数据库中）的客户名称被打印出来。