Java 如何解决“问题”；“无法强制转换对象”；在spring boot中使用Microsoft SQL？

我正在尝试使用Microsoft SQL为我的应用程序调用存储过程。但是，当我运行存储过程传回对象的内容时，它失败了。我的对象是

AVSApplication

，在这个类中，它有一个变量和方法列表。我尝试使用

Iterable

和

列表

，但两者都产生相同的错误。我不确定哪里出了错。我看了其他类似的StackOverflow问题，但我没有从中得到什么

错误：

java.lang.ClassCastException: java.base/[Ljava.lang.Object; cannot be cast to com.Mapping.AVSApplication
    at com.Mapping.Employeecontroller.getAll(Employeecontroller.java:33) ~[classes/:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~

import java.util.*;

import javax.persistence.*;

@Entity
@NamedStoredProcedureQueries(value= {
        @NamedStoredProcedureQuery(name= "procedure-one", procedureName= "GetAllAppWithStatus")
})


public class AVSApplication implements java.io.Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    private String appcode;

    private String acronym;

    private String appname;

    private String sys_id;

    private String mapstatus;

    private String sdg;

    private String status;

    private String statuscode;



    //Constructor
    public AVSApplication(String appcode, String acronym, String appname, String sys_id, String mapstatus,
            String sdg, String status, String statuscode) {
        super();
        this.appcode = appcode;
        this.acronym = acronym;
        this.appname = appname;
        this.sys_id = sys_id;
        this.mapstatus = mapstatus;
        this.sdg = sdg;
        this.status = status;
        this.statuscode = statuscode;
    }




    //Getters

    public String getAppcode() {
        return appcode;
    }

    public String getAcronym() {
        return acronym;
    }

    public String getAppname() {
        return appname;
    }

    public String getSys_id() {
        return sys_id;
    }

    public String getMapstatus() {
        return mapstatus;
    }

    public String getSdg() {
        return sdg;
    }

    public String getStatus() {
        return status;
    }

    public String getStatuscode() {
        return statuscode;
    }




    //Setters

    public void setAppcode(String appcode) {
        this.appcode = appcode;
    }

    public void setAcronym(String acronym) {
        this.acronym = acronym;
    }

    public void setAppname(String appname) {
        this.appname = appname;
    }

    public void setSys_id(String sys_id) {
        this.sys_id = sys_id;
    }

    public void setMapstatus(String mapstatus) {
        this.mapstatus = mapstatus;
    }

    public void setSdg(String sdg) {
        this.sdg = sdg;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public void setStatuscode(String statuscode) {
        this.statuscode = statuscode;
    }


}

@Repository
public class Employeedao {
    @Autowired
    private EntityManager em;

    /**
     * Method to fetch all employees from the db.
     * @return
     */
    @SuppressWarnings("unchecked")
    public List<AVSApplication> getAllEmployees() {
        return em.createNamedStoredProcedureQuery("procedure-one").getResultList();
    }

}

@RestController
public class Employeecontroller {


   @Autowired
   Employeedao edao;



   /**
    * Method to fetch all employees from the db.
    * @return
    */
   @RequestMapping(value= "/getall")
   public void getAll() {
      System.out.println("All objects: " + edao.getAllEmployees());

      System.out.println("Get the first item in list: " + edao.getAllEmployees().get(0).getAppcode());




   }

}

Java实体代码：

java.lang.ClassCastException: java.base/[Ljava.lang.Object; cannot be cast to com.Mapping.AVSApplication
    at com.Mapping.Employeecontroller.getAll(Employeecontroller.java:33) ~[classes/:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~

import java.util.*;

import javax.persistence.*;

@Entity
@NamedStoredProcedureQueries(value= {
        @NamedStoredProcedureQuery(name= "procedure-one", procedureName= "GetAllAppWithStatus")
})


public class AVSApplication implements java.io.Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    private String appcode;

    private String acronym;

    private String appname;

    private String sys_id;

    private String mapstatus;

    private String sdg;

    private String status;

    private String statuscode;



    //Constructor
    public AVSApplication(String appcode, String acronym, String appname, String sys_id, String mapstatus,
            String sdg, String status, String statuscode) {
        super();
        this.appcode = appcode;
        this.acronym = acronym;
        this.appname = appname;
        this.sys_id = sys_id;
        this.mapstatus = mapstatus;
        this.sdg = sdg;
        this.status = status;
        this.statuscode = statuscode;
    }




    //Getters

    public String getAppcode() {
        return appcode;
    }

    public String getAcronym() {
        return acronym;
    }

    public String getAppname() {
        return appname;
    }

    public String getSys_id() {
        return sys_id;
    }

    public String getMapstatus() {
        return mapstatus;
    }

    public String getSdg() {
        return sdg;
    }

    public String getStatus() {
        return status;
    }

    public String getStatuscode() {
        return statuscode;
    }




    //Setters

    public void setAppcode(String appcode) {
        this.appcode = appcode;
    }

    public void setAcronym(String acronym) {
        this.acronym = acronym;
    }

    public void setAppname(String appname) {
        this.appname = appname;
    }

    public void setSys_id(String sys_id) {
        this.sys_id = sys_id;
    }

    public void setMapstatus(String mapstatus) {
        this.mapstatus = mapstatus;
    }

    public void setSdg(String sdg) {
        this.sdg = sdg;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public void setStatuscode(String statuscode) {
        this.statuscode = statuscode;
    }


}

@Repository
public class Employeedao {
    @Autowired
    private EntityManager em;

    /**
     * Method to fetch all employees from the db.
     * @return
     */
    @SuppressWarnings("unchecked")
    public List<AVSApplication> getAllEmployees() {
        return em.createNamedStoredProcedureQuery("procedure-one").getResultList();
    }

}

@RestController
public class Employeecontroller {


   @Autowired
   Employeedao edao;



   /**
    * Method to fetch all employees from the db.
    * @return
    */
   @RequestMapping(value= "/getall")
   public void getAll() {
      System.out.println("All objects: " + edao.getAllEmployees());

      System.out.println("Get the first item in list: " + edao.getAllEmployees().get(0).getAppcode());




   }

}

DAO:

java.lang.ClassCastException: java.base/[Ljava.lang.Object; cannot be cast to com.Mapping.AVSApplication
    at com.Mapping.Employeecontroller.getAll(Employeecontroller.java:33) ~[classes/:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~

import java.util.*;

import javax.persistence.*;

@Entity
@NamedStoredProcedureQueries(value= {
        @NamedStoredProcedureQuery(name= "procedure-one", procedureName= "GetAllAppWithStatus")
})


public class AVSApplication implements java.io.Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    private String appcode;

    private String acronym;

    private String appname;

    private String sys_id;

    private String mapstatus;

    private String sdg;

    private String status;

    private String statuscode;



    //Constructor
    public AVSApplication(String appcode, String acronym, String appname, String sys_id, String mapstatus,
            String sdg, String status, String statuscode) {
        super();
        this.appcode = appcode;
        this.acronym = acronym;
        this.appname = appname;
        this.sys_id = sys_id;
        this.mapstatus = mapstatus;
        this.sdg = sdg;
        this.status = status;
        this.statuscode = statuscode;
    }




    //Getters

    public String getAppcode() {
        return appcode;
    }

    public String getAcronym() {
        return acronym;
    }

    public String getAppname() {
        return appname;
    }

    public String getSys_id() {
        return sys_id;
    }

    public String getMapstatus() {
        return mapstatus;
    }

    public String getSdg() {
        return sdg;
    }

    public String getStatus() {
        return status;
    }

    public String getStatuscode() {
        return statuscode;
    }




    //Setters

    public void setAppcode(String appcode) {
        this.appcode = appcode;
    }

    public void setAcronym(String acronym) {
        this.acronym = acronym;
    }

    public void setAppname(String appname) {
        this.appname = appname;
    }

    public void setSys_id(String sys_id) {
        this.sys_id = sys_id;
    }

    public void setMapstatus(String mapstatus) {
        this.mapstatus = mapstatus;
    }

    public void setSdg(String sdg) {
        this.sdg = sdg;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public void setStatuscode(String statuscode) {
        this.statuscode = statuscode;
    }


}

@Repository
public class Employeedao {
    @Autowired
    private EntityManager em;

    /**
     * Method to fetch all employees from the db.
     * @return
     */
    @SuppressWarnings("unchecked")
    public List<AVSApplication> getAllEmployees() {
        return em.createNamedStoredProcedureQuery("procedure-one").getResultList();
    }

}

@RestController
public class Employeecontroller {


   @Autowired
   Employeedao edao;



   /**
    * Method to fetch all employees from the db.
    * @return
    */
   @RequestMapping(value= "/getall")
   public void getAll() {
      System.out.println("All objects: " + edao.getAllEmployees());

      System.out.println("Get the first item in list: " + edao.getAllEmployees().get(0).getAppcode());




   }

}

---

在给定代码中，不会映射存储过程AVSApplication实例返回的行：

@NamedStoredProcedureQueries(value= {
        @NamedStoredProcedureQuery(name= "procedure-one", procedureName= "GetAllAppWithStatus")
})

若存储过程和实体很好地匹配，那个么定义结果类就足够了：

@NamedStoredProcedureQueries(value= {
    @NamedStoredProcedureQuery(
        name= "procedure-one", 
        procedureName= "GetAllAppWithStatus", 
        resultClasses = {AVSApplication.class}
})

---

如果存在一些差异，则必须定义并参考。

AVSApplication

或

AQSApplication

？请准确点@查看其AVS应用程序我刚刚在将其写入堆栈溢出时出错。现在错误消息不适用于类！显然，您没有显示正在运行的确切代码！请不要手动输入代码，而是复制粘贴代码和错误消息。这样您就可以确保它是合适的。@Seelenvirtuose它应该是，我只使用了一个名为

AVSApplication

的类。我发布了我所有的代码。@Seelenvirtuose从错误中可以看出，它似乎来自对控制器中的

getAll（）

方法的调用。