java - Spring Data 中的自定义方法实现失败并出现属性未找到错误

Question

我正在尝试使用 Spring Boot 1.5.9.RELEASE 在 Spring 数据存储库中实现自定义方法。 我创建了存储库:

package com.example.springdatademo;

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

@Repository
interface MyEntityRepository extends JpaRepository<MyEntity, String>, CustomMyEntityRepository {

}

提供自定义存储库:

package com.example.springdatademo;

interface CustomMyEntityRepository {
    MyEntity myCustomFindQuery();
}

以及实现:

package com.example.springdatademo;

import org.springframework.stereotype.Component;

    @Component
    class CustomMyEntityRepositoryImpl implements CustomMyEntityRepository {


        @Override
        public MyEntity myCustomFindQuery() {
            System.out.println("hello from custom query implementation");
            return null;
        }
    }

另外，我提供了一个调用:

package com.example.springdatademo;

import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.context.annotation.Bean;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

@EntityScan
@EnableJpaRepositories
@SpringBootApplication
public class SpringDataDemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringDataDemoApplication.class, args);
    }

    @Bean
    public CommandLineRunner run(MyEntityRepository repository) {
        return (args) -> {
            final MyEntity myEntity1 = repository.myCustomFindQuery();
            repository.save(new MyEntity(1, "fieldTwo"));
            for (MyEntity myEntity : repository.findAll()) {
                System.out.println(myEntity);
            }
        };
    }

}

pom.xml 只是从 spring 初始化程序生成的普通文件:

<?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>1.5.9.RELEASE</version>
<!--        <version>2.1.9.RELEASE</version>-->
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>spring-data-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>spring-data-demo</name>
    <description>Demo project for Spring Boot</description>

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

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

        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</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>

在 Spring Boot 1.5.9.RELEASE 上运行项目时，我遇到了容器创建问题: 原因:java.lang.IllegalArgumentException:无法创建查询方法 public abstract com.example.springdatademo.MyEntity com.example.springdatademo.CustomMyEntityRepository.myCustomFindQuery()!找不到类型 MyEntity 的属性 myCustomFindQuery!

将 Spring Boot 版本更改为 2.1.9.RELEASE 效果很好，并给出了预期的结果。

我在 spring-data-jpa-1.11.9.RELEASE documentation 中找不到任何提示

Answer 1

我刚刚检查了您的代码并能够修复它。这就是我所做的

重命名MyEntityRepositoryCustomImpl至MyEntityRepositoryImpl和

正如我在评论中告诉你的，自定义存储库应命名为 MyEntityRepositoryCustom (我猜你已经这样做了)

命名约定是这里的关键。 Impl 类应命名为 <BaseRepository>Impl 。而不是<CustomRepository>Impl