Question

我在SpringBoot中编写我的简单项目并使用Hibernate。我有三个实体，但是当我启动我的应用程序时，我有这个错误：

org.springframework.beans.factory.BeanCreationException：在类路径资源中定义名称为'entityManagerFactory'的bean时出错[org / springframework / boot / autoconfigure / orm / jpa / HibernateJpaConfiguration.class]：init的调用方法失败;嵌套异常是org.hibernate.AnnotationException：使用@OneToMany或@ManyToMany定位未映射的类：com.example.entity.User.tasks [javafx.concurrent.Task]

这是我的代码：

package com.example.entity;

import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
import java.util.List;

@Data
@NoArgsConstructor
@Entity
public class Role {

    @Id

    private String name;
    @ManyToMany(mappedBy = "roles")
    private List<User> users;
}

任务：

package com.example.entity;

import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.validation.constraints.NotEmpty;


@Data
@NoArgsConstructor
@Entity
public class Task {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    @NotEmpty
    private String date;

    @NotEmpty
    private String startTime;

    private String stopTime;

    @NotEmpty
    private String description;

    @ManyToOne
    @JoinColumn(name = "USER_EMIAL")
    private User user;

}

USER：

package com.example.entity;

import javafx.concurrent.Task;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.OneToMany;
import javax.validation.constraints.Email;
import javax.validation.constraints.NotEmpty;
import javax.validation.constraints.Size;
import java.util.List;


@Entity
@Data
@NoArgsConstructor
public class User {
    @Id
    @Email
    @NotEmpty
    @Column(unique = true)
    private String email;

    @NotEmpty
    private String name;

    @NotEmpty
    @Size(min = 5)
    private String password;

    @OneToMany(mappedBy = "user", cascade = CascadeType.ALL)
    private List<Task> tasks;

    @ManyToMany(cascade = CascadeType.ALL)
    @JoinTable(name = "USER_ROLE", joinColumns = {
        @JoinColumn(name = "USER_EMAIL", referencedColumnName = "email")
    }, inverseJoinColumns = {@JoinColumn(name = "ROLE_NAME", referencedColumnName = "name")})
    private List<Role> roles;
}

和pom.xml依赖项：

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>5.2.10.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>5.0.12.Final</version>
        </dependency>
    </dependencies>

Answer 1

在User中，您导入了错误的Task类。

只需删除import javafx.concurrent.Task;（您无需导入com.example.entity.Task，因为您的三个类位于同一个包中。）

请注意，错误消息提供了一个很好的提示：

定位未映射的类： com.example.entity.User.tasks [<强> javafx.concurrent.Task

Answer 2

就我而言，缺少@Entity注释已造成此问题。添加后，问题即可解决。

Sprig启动错误：使用@OneToMany或@ManyToMany定位未映射的类

2 个答案: