Spring Boot:错误要求在 JpaRepository 中实现所有方法

问题描述

为什么会这样?几个月前我在 STS 的一个春季项目中工作时并没有发生这种情况.我在课堂上导入了以下内容:

Why is this happening? It didn't happen when I worked on a spring project in STS few months back.I have imported the following in the class:

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

以下是我的 pom.xml:

Following is my 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 http://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>2.1.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.abcd</groupId>
    <artifactId>abcd</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>abcd</name>
    <description></description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</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-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-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>

推荐答案

自定义存储库必须是一个接口，并且必须从 JpaRepository 或 CrudRepository 或 PagingAndSortingRepository 或 MongoRepository，所以通过以下方式更新:

A Custom Repository has to be an interface and this has to extend from JpaRepository or CrudRepository or PagingAndSortingRepository or MongoRepository, so update by following way:

@Repository 
public interface UserRepository extends JpaRepository<User, Long> {....} 

参考资料

官方文档关于存储库核心概念

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