我不能在春天自动装箱

Question

我试图使用spring注释在控制器中自动装配存储库.我收到错误org.springframework.data.repository.query.QueryByExampleExecutor class not found,我无法找到解决方案.

我得到的错误:

SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'articleController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private com.payforeign.article.ArticleRepository com.payforeign.article.ArticleController.repository; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'articleRepository': Invocation of init method failed; nested exception is java.lang.NoClassDefFoundError: org/springframework/data/repository/query/QueryByExampleExecutor

调节器

package com.payforeign.article;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
@RequestMapping("/service")
public class ArticleController {

   @Autowired
   private ArticleRepository repository;

   //controller methods
}

知识库

我有一个带注释的存储库@Repository.根据spring文档,我只有存储库接口.这是对的吗？

package com.payforeign.article;

import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface ArticleRepository extends CrudRepository<Article, Long> {}

applicationContext.xml中

我已经包括jpa:repositories正确base-package和component-scan.我已经指定它是注释驱动(<mvc:annotation-driven /> <tx:annotation-driven />)并添加了JDBC和JPA设置.我的applicationContext.xml是从web.xml正确加载的

<?xml version='1.0' encoding='UTF-8' ?>
<beans ...>
    <context:component-scan base-package="com.payforeign,com.payforeign.article" />
    <mvc:annotation-driven />
    <jpa:repositories base-package="com.payforeign.article" />

    <!-- Data Source -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close" >
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost/payforeign" />
        <property name="username" value="root" />
        <property name="password" value="" />
    </bean>

    <!-- Hibernate -->
    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="packagesToScan" value="com.payforeign.article" />
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="showSql" value="true" />
                <property name="generateDdl" value="true" />
                <property name="database" value="MYSQL" />
            </bean>
        </property>
    </bean>

    <!-- enable the configuration of transactional behavior based on annotations -->
    <tx:annotation-driven />
    <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory" ref="entityManagerFactory" />
    </bean>
</beans>

Answer 1

您的问题是关于依赖性.

您正在寻找的课程在这里:https: //github.com/spring-projects/spring-data-jpa/blob/master/src/main/java/org/springframework/data/jpa/repository/JpaRepository. java的

正如您所看到的,最新版本的spring-data-jpa具有它,因此您应该将失败的拒绝升级到最新版本或稍微降级spring-data-jpa版本(不推荐).

我在使用spring boot和mongoDB jpa存储库的应用程序中遇到了类似的问题.

例如,我有spring-data-jpa和spring-data-mongodb依赖项:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency> 
<dependency>
    <groupId>org.springframework.data</groupId>
    <artifactId>spring-data-mongodb</artifactId>
    <version>1.9.2.RELEASE</version>
</dependency>

但是spring boot-boot-starter-data-jpa隐式使用了比1.9.2.RELEASE更早版本的spring-data-mongodb.最简单的方法是将spring-data-mongodb降级到1.8.4.RELEASE版本.