Question

我无法启动我的项目，此错误弹出：

上下文初始化期间遇到的异常-取消刷新尝试： org.springframework.beans.factory.BeanCreationException：错误创建名称为“ commentRepository”的bean，定义于 com.vivek.discussion.repository.CommentRepository定义于 @EnableJpaRepositories声明于 JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration：无法在设置bean时解析对bean'jpaMappingContext'的引用属性'mappingContext';嵌套异常为 org.springframework.beans.factory.BeanCreationException：错误创建名称为“ jpaMappingContext”的bean：初始化方法的调用失败嵌套的异常是org.hibernate.MappingException：无法查找具有以下逻辑名称的列：postId org.hibernate.mapping.Table（post）及其相关的超表和辅助表

User.class

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.validation.constraints.Email;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotEmpty;
import java.time.Instant;


@Data
@Entity
@AllArgsConstructor
@NoArgsConstructor
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long userId;

    @NotBlank(message = "Username is required")
    private String username;

    @NotBlank(message = "Password is required")
    private String password;

    @Email
    @NotEmpty(message = "Email is required")
    private String email;

    private Instant created;
    private boolean enabled;
}

Post.class

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.lang.Nullable;

import javax.persistence.*;
import javax.validation.constraints.NotBlank;
import java.time.Instant;

@Data
@Entity
@Builder
@AllArgsConstructor
@NoArgsConstructor
public class Post {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;

    @NotBlank(message = "Cannot left this blank")
    private String postName;

    @Nullable
    private String url;

    @Nullable
    @Lob
    private String description;

    private int voteCount;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "userid", referencedColumnName = "userid")
    private User user;

    private Instant createdDate;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "id", referencedColumnName = "id")
    private Subreddit subreddit;
}

Comment.class

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.*;
import javax.validation.constraints.NotEmpty;
import java.time.Instant;

import static javax.persistence.FetchType.LAZY;
import static javax.persistence.GenerationType.IDENTITY;

@Data
@AllArgsConstructor
@NoArgsConstructor
@Entity
public class Comment {

    @Id
    @GeneratedValue(strategy = IDENTITY)
    private Long id;

    @NotEmpty
    private String text;

    @ManyToOne(fetch = LAZY)
    @JoinColumn(name = "postId", referencedColumnName = "postId")
    private Post post;

    private Instant createdDate;

    @ManyToOne(fetch = LAZY)
    @JoinColumn(name = "userId", referencedColumnName = "userId")
    private User user;
}

CommentRepo.class

import com.vivek.discussion.model.Comment;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;


@Repository
public interface CommentRepository extends JpaRepository<Comment,Long> {
}

Pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.4.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.vivek</groupId>
    <artifactId>discussion</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>discussion</name>
    <description>Application where student can discuss on any topic they want</description>

    <properties>
        <java.version>11</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-validation -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</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-web</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</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>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

错误：

Answer 1

在您的Comment类中，更改此行：

@JoinColumn(name = "postId", referencedColumnName = "postId")

对此

@JoinColumn(name = "postId", referencedColumnName = "id")

Answer 2

您的参考列名称导致了您的代码中的问题，在注释类中，应修改注释联接列。将引用的列名更改为id，就像您在班级帖子中提到的id一样。

设置bean属性时无法找到具有逻辑名称的列

2 个答案: