Spring @Autowire 失敗，沒有找到類型的合格 bean 依賴錯誤

Question

突然我不能@Autowired 更多的豆子了。 我創建了一個報告實體

報告.java：

package com.prime.technology.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="report")
public class Report {
...
}

然后我為這個實體創建了一個 DAO 實例

報告DAO.java：

package com.prime.technology.dao;

import java.util.List;

import com.prime.technology.entity.Report;

public interface ReportDAO {
    
    public List<Report> getReports();
...
}

然后我創建了這個接口的實現

報告DAOImpl.java：

package com.prime.technology.dao;

import java.util.List;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.query.Query;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import com.prime.technology.entity.Report;

@Repository
public class ReportDAOImpl implements ReportDAO {

    @Autowired
    private SessionFactory sessionFactory;
    
    @Override
    public List<Report> getReports() {
        ...
    }
...
}

然后我創建了一個服務層

報告服務.java：

package com.prime.technology.service;

import java.util.List;

import com.prime.technology.entity.Report;

public interface ReportService {

    public List<Report> getReports();
...
}

ReportServiceImpl.java：

package com.prime.technology.service;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.TimeZone;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.prime.technology.dao.ReportDAO;
import com.prime.technology.entity.Report;

@Service
public class ReportServiceImpl implements ReportService {

    @Autowired
    private ReportDAO reportDAO;
    
    @Autowired
    private OrderService orderService;
    
    @Override
    @Transactional
    public List<Report> getReports() {
        return reportDAO.getReports();
    }
...

最后我@Autowired Controller 中的 ReportService 接口。 直到這里一切都很完美。 在此之后，我需要為一個非常相似的不同實體重復該過程，但我收到了一個錯誤。 經過數小時的調試，我決定復制上面提到的每個文件，並在每個名稱的末尾添加一個“2”。

Controller.java：

package com.prime.technology.controller;

import java.security.Principal;
import java.util.Calendar;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import com.prime.technology.entity.Report;
import com.prime.technology.entity.User;
import com.prime.technology.service.ReportService;
import com.prime.technology.service.ReportService2;
import com.prime.technology.service.UserService;


@Controller
@RequestMapping("/HR")
public class HrController {
    
    @Autowired
    private UserService userService;
    
    @Autowired
    private ReportService reportService;

    @Autowired
    private ReportService2 reportService2;
...
}

最后報錯：

SEVERE: Servlet [dispatcher] in web application [/Prime-Technology] threw load() exception
org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.prime.technology.service.ReportService2' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1504)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1101)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1062)
    ...

Mar 19, 2021 12:35:41 PM org.apache.jasper.servlet.TldScanner scanJars
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
Mar 19, 2021 12:35:41 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring DispatcherServlet 'dispatcher'
Mar 19, 2021 12:35:41 PM org.springframework.web.servlet.FrameworkServlet initServletBean
INFO: Initializing Servlet 'dispatcher'
Mar 19, 2021 12:35:43 PM org.hibernate.validator.internal.util.Version <clinit>
INFO: HV000001: Hibernate Validator 6.1.6.Final
Mar 19, 2021 12:35:44 PM org.springframework.web.servlet.FrameworkServlet initServletBean
INFO: Completed initialization in 2856 ms
Mar 19, 2021 12:35:44 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-nio-8080"]
Mar 19, 2021 12:35:44 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in [19887] milliseconds
Mar 19, 2021 12:35:45 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [jsp] in context with path [/Prime-Technology] threw exception
java.lang.IllegalStateException: No WebApplicationContext found: no ContextLoaderListener or DispatcherServlet registered?
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:260)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    ...

我提到我使用完整的 Java 配置（無 xml）。 對於其他 bean，它工作得很好，我假設我在配置中沒有任何問題。 提前致謝！ 我期待您的建議！

編輯：報告2.java：

package com.prime.technology.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="old-report")
public class Report2 {
...
}

報告DAO2.java：

package com.prime.technology.dao;

import java.util.List;

import com.prime.technology.entity.Report2;

public interface ReportDAO2 {
    
    public List<Report2> getReports();
...
}

報告DAOImpl2.java：

package com.prime.technology.dao;

import java.util.List;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.query.Query;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import com.prime.technology.entity.Report2;

@Repository
public class ReportDAOImpl2 implements ReportDAO2 {

    @Autowired
    private SessionFactory sessionFactory;
    
    @Override
    public List<Report2> getReports() {
        ...
    }
...
}

ReportService2.java：

package com.prime.technology.service;

import java.util.List;

import com.prime.technology.entity.Report2;

public interface ReportService2 {

    public List<Report2> getReports();
...
}

ReportServiceImpl2.java：

package com.prime.technology.service;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.TimeZone;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.prime.technology.dao.ReportDAO2;
import com.prime.technology.entity.Report2;

@Service
public class ReportServiceImpl2 implements ReportService2 {

    @Autowired
    private ReportDAO2 reportDAO;
    
    @Autowired
    private OrderService orderService;
    
    @Override
    @Transactional
    public List<Report2> getReports() {
        return reportDAO.getReports();
    }
...
}

Answer 1

我想這個問題自己解決了。

我做了什么：

• 我用 @Service("test2") 注釋了 ReportServiceImpl2.java class
• 我創建了一個名為 ReportServiceImpl3.java 的新 ReportService 實現
• 我用 @Service("test3") 注釋了這個 class
• 在 controller 中，我使用了 @Qualifier("test2") 注釋在我這樣做之后它可以工作。 此外，我刪除了 ReportServiceImpl3.java 並且我回到了之前的 state 代碼，它現在可以工作了。

我想這是一個自行解決的IDE（Eclipse）問題。