问题描述
您好，我试图在一个项目上工作时，当我在单个模型上工作时，一切都非常顺利，如您在“学生”下面看到的那样
StudentController
package net.springboot.javaguides.controller;
import javax.validation.Valid;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import net.springboot.javaguides.entity.Student;
import net.springboot.javaguides.repository.StudentRepository;
@Controller
@RequestMapping("/students/")
public class StudentController {
@Autowired
private StudentRepository studentRepository;
@GetMapping("showForm")
public String showStudentForm(Student student) {
return "student/add-student";
}
@GetMapping("list")
public String students(Model model) {
model.addAttribute("students",this.studentRepository.findAll());
return "student/index";
}
@PostMapping("add")
public String addStudent(@Valid Student student,BindingResult result,Model model) {
if(result.hasErrors()) {
return "student/add-student";
}
this.studentRepository.save(student);
return "redirect:list";
}
@GetMapping("edit/{id}")
public String showUpdateForm(@PathVariable ("id") long id,Model model) {
Student student = this.studentRepository.findById(id)
.orElseThrow(() -> new IllegalArgumentException("Invalid student id : " + id));
model.addAttribute("student",student);
return "student/update-student";
}
@PostMapping("update/{id}")
public String updateStudent(@PathVariable("id") long id,@Valid Student student,Model model) {
if(result.hasErrors()) {
student.setId(id);
return "student/update-student";
}
// update student
studentRepository.save(student);
// get all students ( with update)
model.addAttribute("students",this.studentRepository.findAll());
return "student/index";
}
@GetMapping("delete/{id}")
public String deleteStudent(@PathVariable ("id") long id,Model model) {
Student student = this.studentRepository.findById(id)
.orElseThrow(() -> new IllegalArgumentException("Invalid student id : " + id));
this.studentRepository.delete(student);
model.addAttribute("students",this.studentRepository.findAll());
return "student/index";
}
}
StudentEntity
package net.springboot.javaguides.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 = "students")
public class Student {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
@Column(name = "name")
private String name;
@Column(name = "email")
private String email;
@Column(name = "phone_no")
private long phoneNo;
public Student() {
super();
}
public Student(String name,String email) {
super();
this.name = name;
this.email = email;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public long getPhoneNo() {
return phoneNo;
}
public void setPhoneNo(long phoneNo) {
this.phoneNo = phoneNo;
}
}
StudentRepository
package net.springboot.javaguides.repository;
import java.util.List;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
import net.springboot.javaguides.entity.Student;
@Repository
public interface StudentRepository extends JpaRepository<Student,Long>{
List<Student> findByName(String name);
}
CourseController
package net.springboot.javaguides.controller;
import javax.validation.Valid;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import net.springboot.javaguides.entity.Course;
import net.springboot.javaguides.repository.CourseRepository;
@Controller
@RequestMapping("/courses/")
public class CourseController {
@Autowired
private CourseRepository courseRepository;
@GetMapping("showForm")
public String showCourseForm(Course course) {
return "add-course";
}
@GetMapping("list")
public String courses(Model model) {
model.addAttribute("courses",this.courseRepository.findAll());
return "index";
}
@PostMapping("add")
public String addCourse(@Valid Course course,Model model) {
if(result.hasErrors()) {
return "add-course";
}
this.courseRepository.save(course);
return "redirect:list";
}
@GetMapping("edit/{id}")
public String showUpdateForm(@PathVariable ("id") long id,Model model) {
Course course = this.courseRepository.findById(id)
.orElseThrow(() -> new IllegalArgumentException("Invalid course id : " + id));
model.addAttribute("course",course);
return "update-course";
}
@PostMapping("update/{id}")
public String updateCourse(@PathVariable("id") long id,@Valid Course course,Model model) {
if(result.hasErrors()) {
course.setId(id);
return "update-course";
}
// update course
courseRepository.save(course);
// get all courses ( with update)
model.addAttribute("courses",this.courseRepository.findAll());
return "index";
}
@GetMapping("delete/{id}")
public String deleteCourse(@PathVariable ("id") long id,Model model) {
Course course = this.courseRepository.findById(id)
.orElseThrow(() -> new IllegalArgumentException("Invalid course id : " + id));
this.courseRepository.delete(course);
model.addAttribute("courses",this.courseRepository.findAll());
return "index";
}
}
课程实体
package net.springboot.javaguides.entity;
import java.sql.Date;
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 = "Courses")
public class Course {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name = "cours_name")
private String cours_name;
@Column(name = "date_debut")
private Date date_debut;
@Column(name = "date_fin")
private Date date_fin;
@Column(name = "enseignant")
private String enseignant;
@Column(name = "type_cours")
private String type_cours;
@Column(name = "filliere")
private String filliere;
public Course() {
super();
}
public Course(String cours_name,Date date_debut,Date date_fin,String enseignant,String type_cours,String filliere) {
super();
this.cours_name = cours_name;
this.date_debut = date_debut;
this.date_fin = date_fin;
this.enseignant = enseignant;
this.type_cours = type_cours;
this.filliere = filliere;
}
public Long getId() {
return id;
}
public String getCours_name() {
return cours_name;
}
public void setCours_name(String cours_name) {
this.cours_name = cours_name;
}
public Date getDate_debut() {
return date_debut;
}
public void setDate_debut(Date date_debut) {
this.date_debut = date_debut;
}
public Date getDate_fin() {
return date_fin;
}
public void setDate_fin(Date date_fin) {
this.date_fin = date_fin;
}
public String getEnseignant() {
return enseignant;
}
public void setEnseignant(String enseignant) {
this.enseignant = enseignant;
}
public String getType_cours() {
return type_cours;
}
public void setType_cours(String type_cours) {
this.type_cours = type_cours;
}
public String getfilliere() {
return filliere;
}
public void setfilliere(String filliere) {
this.filliere = filliere;
}
public void setId(Long id) {
this.id = id;
}
}
**
CourseRepository
**
package net.springboot.javaguides.repository;
import java.util.List;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
import net.springboot.javaguides.entity.Course;
@Repository
public interface CourseRepository extends JpaRepository<Course,Long>{
List<Course> findByName(String cours_name);
}
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__,| / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.0.RELEASE)
2020-08-27 13:44:03.876 INFO 9188 --- [ restartedMain] s.j.SpringbootthymeleafWebAppApplication : Starting SpringbootthymeleafWebAppApplication on DESKTOP-5D7IMCJ with PID 9188 (C:\Users\yassi\Desktop\workspacenew\springboot-thymeleaf-web-app-master\target\classes started by yassi in C:\Users\yassi\Desktop\workspacenew\springboot-thymeleaf-web-app-master)
2020-08-27 13:44:03.880 INFO 9188 --- [ restartedMain] s.j.SpringbootthymeleafWebAppApplication : No active profile set,falling back to default profiles: default
2020-08-27 13:44:03.941 INFO 9188 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2020-08-27 13:44:03.941 INFO 9188 --- [ restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2020-08-27 13:44:04.881 INFO 9188 --- [ restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2020-08-27 13:44:04.957 INFO 9188 --- [ restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 68ms. Found 2 repository interfaces.
2020-08-27 13:44:05.415 INFO 9188 --- [ restartedMain] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringcglib$$97fbb782] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-08-27 13:44:05.849 INFO 9188 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-08-27 13:44:05.868 INFO 9188 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-08-27 13:44:05.868 INFO 9188 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/9.0.12
2020-08-27 13:44:05.876 INFO 9188 --- [ restartedMain] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files\Java\jre1.8.0_221\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java/jre1.8.0_221/bin/server;C:/Program Files/Java/jre1.8.0_221/bin;C:/Program Files/Java/jre1.8.0_221/lib/amd64;C:\oraclexe\app\oracle\product\11.2.0\server\bin;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;C:\Program Files\Microsoft sql Server\Client SDK\ODBC\110\Tools\Binn\;C:\Program Files (x86)\Microsoft sql Server\120\Tools\Binn\ManagementStudio\;C:\Program Files (x86)\Microsoft sql Server\120\Tools\Binn\;C:\Program Files\Microsoft sql Server\120\Tools\Binn\;C:\Program Files (x86)\Microsoft sql Server\120\DTS\Binn\;C:\Program Files\Microsoft sql Server\120\DTS\Binn\;C:\Program Files (x86)\Microsoft sql Server\110\Tools\Binn\ManagementStudio\;C:\Program Files (x86)\Microsoft sql Server\110\Tools\Binn\;C:\Program Files (x86)\Microsoft Visual Studio 11.0\Common7\IDE\PrivateAssemblies\;C:\Program Files (x86)\Microsoft sql Server\110\DTS\Binn\;C:\Program Files\Git\cmd;C:\Program Files\nodejs\;C:\Program Files\MysqL\MysqL Server 5.1\bin;C:\Users\yassi\AppData\Local\Microsoft\WindowsApps;;C:\Users\yassi\AppData\Local\Programs\Microsoft VS Code\bin;D:\eclipse;;.]
2020-08-27 13:44:05.990 INFO 9188 --- [ restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-08-27 13:44:05.990 INFO 9188 --- [ restartedMain] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2049 ms
2020-08-27 13:44:06.025 INFO 9188 --- [ restartedMain] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2020-08-27 13:44:06.031 INFO 9188 --- [ restartedMain] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2020-08-27 13:44:06.031 INFO 9188 --- [ restartedMain] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2020-08-27 13:44:06.031 INFO 9188 --- [ restartedMain] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'formContentFilter' to: [/*]
2020-08-27 13:44:06.031 INFO 9188 --- [ restartedMain] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2020-08-27 13:44:06.203 INFO 9188 --- [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2020-08-27 13:44:06.332 INFO 9188 --- [ restartedMain] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2020-08-27 13:44:06.388 INFO 9188 --- [ restartedMain] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2020-08-27 13:44:06.630 INFO 9188 --- [ restartedMain] org.hibernate.Version : HHH000412: Hibernate Core {5.3.7.Final}
2020-08-27 13:44:06.632 INFO 9188 --- [ restartedMain] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2020-08-27 13:44:06.776 INFO 9188 --- [ restartedMain] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.4.Final}
2020-08-27 13:44:06.917 INFO 9188 --- [ restartedMain] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.MysqL5InnoDBDialect
2020-08-27 13:44:07.829 INFO 9188 --- [ restartedMain] j.LocalContainerEntityManagerfactorybean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2020-08-27 13:44:07.871 INFO 9188 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729
2020-08-27 13:44:08.146 WARN 9188 --- [ restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'courseController': Unsatisfied dependency expressed through field 'courseRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'courseRepository': Invocation of init method Failed; nested exception is java.lang.IllegalArgumentException: Failed to create query for method public abstract java.util.List net.springboot.javaguides.repository.CourseRepository.findByName(java.lang.String)! No property name found for type Course!
解决方法
尝试在主类的顶部添加@EnableJpaRepositories(packages)。
我遇到了同样的问题，我通过添加@EntityScan或@EnableJpaRepositories（packages）
进行了处理。 ,日志已经说明了问题！ .repository.CourseRepository.findByName（java.lang.String）！找不到课程类型的属性名称！您的Course实体没有名为name的属性，称为cours_name。将您的“课程”实体中的cours_name更改为在CourseRepository中的名称或更改方法的名称！