使用 Spring-Data-Solr 注入存储库

Question

我对 Spring 还很陌生，我想试试 spring-data-solr。

当我尝试注入我的 TeamRepository 时，问题似乎发生了，TeamRepository 是一个扩展 SolrCrudRepository 的空接口。我尝试过使用 annotatedConfiguration 和 XmlConfiguration 甚至两者，但似乎没有得到任何结果。

我正在启动的堆栈跟踪是：

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Disconnected from the target VM, address: '127.0.0.1:54211', transport: 'socket'
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'repositoryTeamIndexService': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: public app.solr.repository.solr.TeamRepository app.solr.repository.RepositoryTeamIndexService.repository; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'teamRepository': FactoryBean threw exception on object creation; nested exception is java.lang.NullPointerException
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:288)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1120)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:522)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:461)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:607)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
    at org.springframework.context.annotation.AnnotationConfigApplicationContext.<init>(AnnotationConfigApplicationContext.java:73)
    at app.application.Main.main(Main.java:12)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: public app.solr.repository.solr.TeamRepository app.solr.repository.RepositoryTeamIndexService.repository; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'teamRepository': FactoryBean threw exception on object creation; nested exception is java.lang.NullPointerException
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:514)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:285)
    ... 12 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'teamRepository': FactoryBean threw exception on object creation; nested exception is java.lang.NullPointerException
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:149)
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:102)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1443)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:873)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:815)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:730)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:486)
    ... 14 more
Caused by: java.lang.NullPointerException
    at org.springframework.data.solr.repository.support.MappingSolrEntityInformation.getIdAttribute(MappingSolrEntityInformation.java:68)
    at org.springframework.data.solr.repository.support.SimpleSolrRepository.<init>(SimpleSolrRepository.java:73)
    at org.springframework.data.solr.repository.support.SolrRepositoryFactory.getTargetRepository(SolrRepositoryFactory.java:64)
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:137)
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.getObject(RepositoryFactoryBeanSupport.java:125)
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.getObject(RepositoryFactoryBeanSupport.java:41)
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:142)
    ... 22 more

我已将我的小项目上传到 GitHub。有人可以帮忙找出错误吗？

Project on GitHub

Answer 1

每个 SolrDocument 都需要一个 id。您可以通过在文档的字段上添加 @Id 注释来提供此元信息：

import org.springframework.data.annotation.Id;

public class TeamDocument extends SolrDocument {

    @Id
    private String id;

    ...
}

stacktrace 给你一个提示（它试图检索 id 属性但因为它不存在而失败）：

Caused by: java.lang.NullPointerException
   at org.springframework.data.solr.repository.support.MappingSolrEntityInformation.getIdAttribute(MappingSolrEntityInformation.java:68)