Mongo Db数据库中的Spring JPA自定义方法实现不起作用

【问题标题】：Spring JPA Custom Method Implementations in Mongo Db Database not workingMongo Db数据库中的Spring JPA自定义方法实现不起作用
【发布时间】：2017-09-30 16:40:42
【问题描述】：

我是 Spring-JPA 的新手，并试图了解它的工作原理。 我需要实现 Mongo DB 日期时间字段的 Spring JPA 实现。我所要做的就是执行与以下查询等效的 JPA。如果通知时间小于当前时间，我必须更新记录以将其标记为已发送通知并发送了通知。但我什至无法让 spring 运行。

这在 JPA 中是否可行。我见过很多自定义 sql 查询，但没有遇到 nosql 在 JPA 上下文中实现自定义方法。

db.scheduledNotifications.find({"notificationTime":{$lte:new ISODate(?(now()}})

我从互联网上的一些指南和一些教程开始。

public interface ScheduledNotificationsRepositoryCustom
 {
    List<ScheduledNotifications> getNotification(Instant instant);

}

@Repository
@Transactional(readOnly=true)
public class ScheduledNotificationsRepositoryCustomImpl implements ScheduledNotificationsRepositoryCustom 
{
    @PersistenceContext
    EntityManager entityManager;
    @Override
    public List<ScheduledNotifications> getNotification(Instant instant) {
        // TODO Auto-generated method stub
        Query query=entityManager.createNativeQuery("{'notificationTime' : { '$lte' : ?0 }}", ScheduledNotifications.class);
        List<ScheduledNotifications> notifications=query.getResultList();
        return notifications;
    }

}

@Repository
public interface ScheduledNotificationsRepository extends JpaRepository<ScheduledNotifications, String>,ScheduledNotificationsRepositoryCustom 
{

}

之后，当我尝试保存项目时，Spring 抱怨抛出以下异常。 启动 ApplicationContext 时出错。要显示自动配置报告，请在启用“调试”的情况下重新运行您的应用程序。

2017-05-03 07:27:08.643 ERROR 11104 --- [  restartedMain] o.s.boot.SpringApplication               : Application startup failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'scheduledNotificationController' defined in file [E:\lending\target\classes\hello\ScheduledNotificationController.class]: Post-processing of merged bean definition failed; nested exception is java.lang.IllegalStateException: Failed to introspect bean class [hello.ScheduledNotificationController] for resource metadata: could not find class that it depends on
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:526) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at hello.Application.main(Application.java:12) [classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_60]
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_60]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_60]
    at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_60]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-1.5.3.RELEASE.jar:1.5.3.RELEASE]
Caused by: java.lang.IllegalStateException: Failed to introspect bean class [hello.ScheduledNotificationController] for resource metadata: could not find class that it depends on
    at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.findResourceMetadata(CommonAnnotationBeanPostProcessor.java:344) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessMergedBeanDefinition(CommonAnnotationBeanPostProcessor.java:297) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyMergedBeanDefinitionPostProcessors(AbstractAutowireCapableBeanFactory.java:992) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:523) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    ... 20 common frames omitted
Caused by: java.lang.NoClassDefFoundError: org/springframework/data/jpa/repository/JpaRepository
    at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_60]
    at java.lang.ClassLoader.defineClass(Unknown Source) ~[na:1.8.0_60]
    at java.security.SecureClassLoader.defineClass(Unknown Source) ~[na:1.8.0_60]
    at java.net.URLClassLoader.defineClass(Unknown Source) ~[na:1.8.0_60]
    at java.net.URLClassLoader.access$100(Unknown Source) ~[na:1.8.0_60]
    at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.8.0_60]
    at java.net.URLClassLoader$1.run(Unknown Source) ~[na:1.8.0_60]
    at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_60]
    at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.8.0_60]
    at org.springframework.boot.devtools.restart.classloader.RestartClassLoader.findClass(RestartClassLoader.java:165) ~[spring-boot-devtools-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.devtools.restart.classloader.RestartClassLoader.loadClass(RestartClassLoader.java:148) ~[spring-boot-devtools-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_60]
    at java.lang.Class.getDeclaredFields0(Native Method) ~[na:1.8.0_60]
    at java.lang.Class.privateGetDeclaredFields(Unknown Source) ~[na:1.8.0_60]
    at java.lang.Class.getDeclaredFields(Unknown Source) ~[na:1.8.0_60]
    at org.springframework.util.ReflectionUtils.getDeclaredFields(ReflectionUtils.java:715) ~[spring-core-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.util.ReflectionUtils.doWithLocalFields(ReflectionUtils.java:656) ~[spring-core-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.buildResourceMetadata(CommonAnnotationBeanPostProcessor.java:361) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.findResourceMetadata(CommonAnnotationBeanPostProcessor.java:340) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    ... 23 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.springframework.data.jpa.repository.JpaRepository
    at java.net.URLClassLoader.findClass(Unknown Source) ~[na:1.8.0_60]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_60]
    at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) ~[na:1.8.0_60]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_60]
    at org.springframework.boot.devtools.restart.classloader.RestartClassLoader.loadClass(RestartClassLoader.java:151) ~[spring-boot-devtools-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at java.lang.ClassLoader.loadClass(Unknown Source) ~[na:1.8.0_60]

... 42 common frames omitted

有没有看到上面的错误。

pom.xml 

     <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>
<build>

<plugins>
<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-resources-plugin</artifactId>
  <configuration>
    <delimiters>
     <delimiter>${*}</delimiter><!-- to keep the default behavior -->
     <delimiter>@</delimiter><!-- to add Ant-like tokens style -->
    </delimiters>
  </configuration>
</plugin>
</plugins>
</build>
  <groupId>smenotification</groupId>
  <artifactId>lending</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>lending</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.3.RELEASE</version>
</parent>

  <dependencies>
  <dependency>
    <groupId>org.springframework.data</groupId>
    <artifactId>spring-data-jpa</artifactId>
    </dependency>
 <!--  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-core</artifactId>
    </dependency> -->
   <!-- https://mvnrepository.com/artifact/org.springframework.kafka/spring-kafka -->
<dependency>
    <groupId>org.springframework.kafka</groupId>
    <artifactId>spring-kafka</artifactId>
    <version>1.2.0.RELEASE</version><!--$NO-MVN-MAN-VER$-->
</dependency>
<dependency>
      <groupId>org.springframework.kafka</groupId>
      <artifactId>spring-kafka-test</artifactId>
     <scope>test</scope>
    </dependency>

    <!-- <dependency>
      <groupId>org.springframework.kafka</groupId>
      <artifactId>spring-kafka-test</artifactId>
      <scope>test</scope>
    </dependency> -->
  <dependency>

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

    <!-- <dependency><groupId>org.springframework</groupId>
    <artifactId>spring-messaging</artifactId>
    <version>4.2.0.RELEASE</version>
    </dependency>  --> 
        <!-- https://mvnrepository.com/artifact/org.hibernate.javax.persistence/hibernate-jpa-2.1-api -->
<dependency>
    <groupId>org.hibernate.javax.persistence</groupId>
    <artifactId>hibernate-jpa-2.1-api</artifactId>
        <version>1.0.0.Final</version>

</dependency>
<!-- https://mvnrepository.com/artifact/com.googlecode.json-simple/json-simple -->
<dependency>
    <groupId>com.googlecode.json-simple</groupId>
    <artifactId>json-simple</artifactId>
    </dependency>

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-context-support</artifactId>
    </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
                    </dependency>
  <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>
     <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
<!--   <dependency>
            <groupId>org.apache.kafka</groupId>
            <artifactId>kafka-clients</artifactId>
            <version>0.9.0.1</version>
            <scope>provided</scope>
        </dependency> -->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <scope>test</scope>
    </dependency>
    <dependency>
  <groupId>org.influxdb</groupId>
  <artifactId>influxdb-java</artifactId>
  <version>2.5</version>
</dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-cloud-connectors</artifactId>
    </dependency>
  </dependencies>
</project>

【问题讨论】：

  • java.lang.ClassNotFoundException: org.springframework.data.jpa.repository.JpaRepository 意味着你搞砸了你的类路径。看着你pom.xml：是的，那看起来确实很乱。删除评论的东西。并使用依赖插件检查冲突。

标签： spring-boot spring-data spring-data-jpa


【解决方案1】：

清理 maven 缓存解决了 classnotfound 问题。

【讨论】：

  • 这不是答案。
  • 清理 maven 缓存后，问题仍然存在。这就是为什么我没有将其作为解决方案输入。天知道我清理/重建了 maven 缓存多少次。问题与我实现的方式有关mongo 的自定义存储库。我正在寻找使用 @Query 注释并使用 mongo 的本机查询来获取所需数据的方法。但它从来没有工作过。不知道这是否是语法问题。我会从网站
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