我是Spring的新手。我试着用SOLID技术创建一个项目,但是遇到了这个错误。继承在我的应用程序中不起作用。为什么继承不能正常工作?Spring允许继承吗?
错误文本:
2021-06-23 23:54:08.928 INFO 12984 --- [ restartedMain] hrms.northwind.NorthwindApplication : Starting NorthwindApplication using Java 15.0.2 on DESKTOP-87K40S0 with PID 12984 (C:\Users\90553\Desktop\Eclipse Projects\HRMS Project\target\classes started by 90553 in C:\Users\90553\Desktop\Eclipse Projects\HRMS Project)
2021-06-23 23:54:08.929 INFO 12984 --- [ restartedMain] hrms.northwind.NorthwindApplication : No active profile set, falling back to default profiles: default
2021-06-23 23:54:08.978 INFO 12984 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2021-06-23 23:54:08.978 INFO 12984 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2021-06-23 23:54:09.465 INFO 12984 --- [ restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2021-06-23 23:54:09.512 INFO 12984 --- [ restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 40 ms. Found 2 JPA repository interfaces.
2021-06-23 23:54:10.040 INFO 12984 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2021-06-23 23:54:10.052 INFO 12984 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2021-06-23 23:54:10.052 INFO 12984 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.46]
2021-06-23 23:54:10.130 INFO 12984 --- [ restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2021-06-23 23:54:10.130 INFO 12984 --- [ restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1152 ms
2021-06-23 23:54:10.203 INFO 12984 --- [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2021-06-23 23:54:10.367 INFO 12984 --- [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2021-06-23 23:54:10.458 INFO 12984 --- [ restartedMain] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [name: default]
2021-06-23 23:54:10.502 INFO 12984 --- [ restartedMain] org.hibernate.Version : HHH000412: Hibernate ORM core version 5.4.32.Final
2021-06-23 23:54:10.619 INFO 12984 --- [ restartedMain] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.1.2.Final}
2021-06-23 23:54:10.721 INFO 12984 --- [ restartedMain] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.PostgreSQLDialect
2021-06-23 23:54:11.047 WARN 12984 --- [ restartedMain] org.hibernate.cfg.AnnotationBinder : HHH000139: Illegal use of @Table in a subclass of a SINGLE_TABLE hierarchy: hrms.northwind.entities.concretes.Employer
2021-06-23 23:54:11.049 WARN 12984 --- [ restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is java.lang.ClassCastException: class org.hibernate.mapping.SingleTableSubclass cannot be cast to class org.hibernate.mapping.RootClass (org.hibernate.mapping.SingleTableSubclass and org.hibernate.mapping.RootClass are in unnamed module of loader 'app')
2021-06-23 23:54:11.050 INFO 12984 --- [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
2021-06-23 23:54:11.053 INFO 12984 --- [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.
2021-06-23 23:54:11.057 INFO 12984 --- [ restartedMain] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2021-06-23 23:54:11.066 INFO 12984 --- [ restartedMain] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-06-23 23:54:11.084 ERROR 12984 --- [ restartedMain] o.s.boot.SpringApplication : Application run failed
雇主类别:
package hrms.northwind.entities.concretes;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import lombok.Data;
@Entity(name="Employers")
@Table(name="Employers")
@Data
public class Employer extends Person {
@Id
@GeneratedValue
@Column(name="employer_id")
private int employerId;
@Column(name="company_name")
private String company_name;
@Column(name="website")
private String website;
@Column(name="phone_number")
private String phone_number;
@Column(name="password")
private String password;
public Employer(int personId, String name, String surname, String email, int employerId, String company_name, String website,
String phone_number, String password) {
super(personId, name, surname, email);
this.employerId = employerId;
this.company_name = company_name;
this.website = website;
this.phone_number = phone_number;
this.password = password;
}
}
雇主刀:
package hrms.northwind.dataAccess.abstracts;
import org.springframework.data.jpa.repository.JpaRepository;
import hrms.northwind.entities.concretes.Employer;
public interface EmployerDao extends JpaRepository<Employer,Integer>{
}
雇主服务:
package hrms.northwind.business.abstracts;
import java.util.List;
import org.springframework.stereotype.Service;
import hrms.northwind.entities.concretes.Employer;
@Service
public interface EmployerService {
List<Employer> getAll();
}
雇主财务总监:
package hrms.northwind.api.controllers;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import hrms.northwind.business.abstracts.EmployerService;
import hrms.northwind.entities.concretes.Employer;
@RestController
@RequestMapping("/api/employers")
public class EmployerController {
private EmployerService employerService;
@Autowired
public EmployerController(EmployerService employerService) {
super();
this.employerService = employerService;
}
@GetMapping("/getall")
public List<Employer> getAll(){
return this.employerService.getAll();
}
}
雇主表:
Employer Table
有什么帮助吗?
2条答案
按热度按时间t1qtbnec1#
也许这个答案已经晚了
我认为问题出在
@Table
上。当你想指定一个实体时,那个注解是可选的。您可以找到更好的记录答案here
yvfmudvl2#
您可以将其添加到雇主类中。