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[英]Spring Boot + Hibernate JPA configuration to use EntityManager
[英]Getting an error that cannot create entityManager while trying to use Spring Data JPA with Spring Boot
我目前正在研究一个 POC,以将 Spring Boot 与 Spring Data JPA 结合使用。
我想使用 Spring Data JPA 从数据库中获取记录。
我收到以下错误
创建名为“bookRepository”的 bean 时出错:在设置 bean 属性“entityManager”时无法创建类型为 [org.springframework.orm.jpa.SharedEntityManagerCreator] 的内部 bean“(inner bean)”; 嵌套异常是 org.springframework.beans.factory.BeanCreationException:创建名为 '(inner bean)#2' 的 bean 时出错:设置构造函数参数时无法解析对 bean 'entityManagerFactory' 的引用; 嵌套异常是 org.springframework.beans.factory.NoSuchBeanDefinitionException:没有定义名为“entityManagerFactory”的 bean
这是我的配置类:
package com.boot.configration;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
@EnableAutoConfiguration
@ComponentScan
@EnableJpaRepositories
public class ApplicationStarter {
public static void main (String[] args) {
SpringApplication.run(ApplicationStarter.class, args);
}
}
下面是我的仓库
package com.boot.configration;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;
@Repository
public interface BookRepository extends JpaRepository<Book, String> {
public Iterable<Book> findBooksByAuthor(@Param("author") String author);
}
这是我的控制器
@RestController
public class BookController {
@Autowired
protected BookRepository bookRepository;
@RequestMapping(value = "/isbn")
@ResponseBody
public String book() {
Book book = bookRepository.findOne("2222222");
return "Book Name is = " + book.getTitle()+ " " + "Author is = " + book.getAuthor();
}
}
在 POM.xml 我有以下依赖项:
<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>
<groupId>BOOT</groupId>
<artifactId>SpringBootProject</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.0.0.RC1</version>
</parent>
<repositories>
<repository>
<id>spring-snapshots</id>
<url>http://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
<repository>
<id>spring-milestones</id>
<url>http://repo.spring.io/milestone</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-snapshots</id>
<url>http://repo.spring.io/snapshot</url>
</pluginRepository>
<pluginRepository>
<id>spring-milestones</id>
<url>http://repo.spring.io/milestone</url>
</pluginRepository>
</pluginRepositories>
<name>SpringBootProject</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
</dependencies>
</project>
请帮我解决这个错误
您可以尝试使用 spring-boot 1.0.2.RELEASE 吗?
我认为您缺少数据库驱动程序依赖性。 就像您使用 posgress 一样,您需要提供驱动程序 jar。
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
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