Spring Boot MVC 转换器无法自动装配 Neo4J 数据存储库

【问题标题】：Spring Boot MVC Converter Cannot Autowire Neo4J Data RepositoriesSpring Boot MVC 转换器无法自动装配 Neo4J 数据存储库
【发布时间】：2014-09-29 17:02:21
【问题描述】：

我需要将 Spring Data Neo4J 存储库 @Autowire 到 Spring MVC 转换器（在 Spring Boot 中），但 MVC 配置在数据服务启动之前启动。这会导致@Autowired not found 问题。 如何让数据服务在 MVC 之前启动，以便它找到符合条件的 bean？

我有一个项目正在从 XML Spring 配置转换为 Spring Boot。除 MVC 转换器外，一切正常。他们无法@Autowire Neo4J Repository 类。

如果删除存储库的@Autowire 和值中的硬代码，则黑客攻击会按预期工作。服务中的其他操作使用存储库就好了。似乎 MVC 配置在 Neo4J 管道开始之前就开始了，然后找不到合适的组件来连接。我看过了，但我不知道如何在 MVC 配置之前启动数据配置。

这是我的基本配置：

@Configuration
@ComponentScan
@EnableAutoConfiguration
public class Toyfiles {
    public static void main(String[] args) throws Exception {
        SpringApplication.run(Toyfiles.class, args);
    }
}

我的 MVC 配置：

@Configuration
public class MVCBeans extends WebMvcConfigurerAdapter {
@Autowired
private StringToBrand stringToBrand;

@Autowired
private BrandToString brandToString;

@Override
public void addFormatters(FormatterRegistry registry) {
    registry.addConverter(stringToBrand);
    registry.addConverter(brandToString);
    super.addFormatters(registry);
}

}

有问题的转换器：

@Component
public class StringToBrand implements Converter<String, Brand> {
    @Autowired
    BrandRepository brandRepository;

    @Override
    public Brand convert(String s) {
        return brandRepository.findBrandByName(s);
    }
}

数据配置：

@Configuration
@Profile("localEmbeddedDBServer")
@EnableTransactionManagement
@EnableNeo4jRepositories(basePackages = "com.toyfiles.dataservices.")
public class LocalDBConfig extends Neo4jConfiguration {

    public LocalDBConfig() {
        setBasePackage("com.toyfiles");
    }

    @Bean
    public GraphDatabaseService graphDatabaseService() {
        return new GraphDatabaseFactory().newEmbeddedDatabase("target/graph.db");
    }
}

以及存储库：

public interface BrandRepository extends GraphRepository<Brand> {

    @Query(value = "MATCH (brand:Brand {name:{0}})-[:PART_OF]->line RETURN line")
    public List<Line> getLinesForBrand(String name);

    @Query(value = "MATCH (brand:Brand {name:{0}}) DELETE brand")
    public void deleteBrandByName(String name);

    public Brand findBrandByName(String name);
}

异常中“有趣”的部分：

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'brandRepository': Cannot resolve reference to bean 'neo4jTemplate' while setting bean property 'neo4jTemplate'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'neo4jTemplate' defined in class path resource [com/toyfiles/configuration/LocalDBConfig.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.data.neo4j.support.Neo4jTemplate org.springframework.data.neo4j.config.Neo4jConfiguration.neo4jTemplate() throws java.lang.Exception] threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'neo4jMappingContext' defined in class path resource [com/toyfiles/configuration/LocalDBConfig.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@4d49af10: startup date [Mon Sep 29 09:48:25 PDT 2014]; root of context hierarchy
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:336)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:108)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1457)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1198)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1021)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:964)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:862)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:481)
    ... 116 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'neo4jTemplate' defined in class path resource [com/toyfiles/configuration/LocalDBConfig.class]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.data.neo4j.support.Neo4jTemplate org.springframework.data.neo4j.config.Neo4jConfiguration.neo4jTemplate() throws java.lang.Exception] threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'neo4jMappingContext' defined in class path resource [com/toyfiles/configuration/LocalDBConfig.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@4d49af10: startup date [Mon Sep 29 09:48:25 PDT 2014]; root of context hierarchy
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:597)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1095)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:990)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:504)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:328)
    ... 129 more
Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Factory method [public org.springframework.data.neo4j.support.Neo4jTemplate org.springframework.data.neo4j.config.Neo4jConfiguration.neo4jTemplate() throws java.lang.Exception] threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'neo4jMappingContext' defined in class path resource [com/toyfiles/configuration/LocalDBConfig.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@4d49af10: startup date [Mon Sep 29 09:48:25 PDT 2014]; root of context hierarchy
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:188)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:586)
    ... 138 more
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'neo4jMappingContext' defined in class path resource [com/toyfiles/configuration/LocalDBConfig.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@4d49af10: startup date [Mon Sep 29 09:48:25 PDT 2014]; root of context hierarchy
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1554)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:288)
    at com.toyfiles.configuration.LocalDBConfig$$EnhancerBySpringCGLIB$$321222c6.mappingInfrastructure(<generated>)
    at org.springframework.data.neo4j.config.Neo4jConfiguration.neo4jTemplate(Neo4jConfiguration.java:135)
    at com.toyfiles.configuration.LocalDBConfig$$EnhancerBySpringCGLIB$$321222c6.CGLIB$neo4jTemplate$23(<generated>)
    at com.toyfiles.configuration.LocalDBConfig$$EnhancerBySpringCGLIB$$321222c6$$FastClassBySpringCGLIB$$12e74a61.invoke(<generated>)
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:312)
    at com.toyfiles.configuration.LocalDBConfig$$EnhancerBySpringCGLIB$$321222c6.neo4jTemplate(<generated>)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:166)
    ... 139 more
Caused by: java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@4d49af10: startup date [Mon Sep 29 09:48:25 PDT 2014]; root of context hierarchy
    at org.springframework.context.support.AbstractApplicationContext.getApplicationEventMulticaster(AbstractApplicationContext.java:346)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:333)
    at org.springframework.data.mapping.context.AbstractMappingContext.addPersistentEntity(AbstractMappingContext.java:307)
    at org.springframework.data.neo4j.support.mapping.Neo4jMappingContext.addPersistentEntity(Neo4jMappingContext.java:69)
    at org.springframework.data.neo4j.support.mapping.Neo4jMappingContext.addPersistentEntity(Neo4jMappingContext.java:49)
    at org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:181)
    at org.springframework.data.neo4j.mapping.RelationshipInfo.<init>(RelationshipInfo.java:65)
    at org.springframework.data.neo4j.mapping.RelationshipInfo.fromField(RelationshipInfo.java:79)
    at org.springframework.data.neo4j.support.mapping.Neo4jPersistentPropertyImpl.extractRelationshipInfo(Neo4JPersistentPropertyImpl.java:128)
    at org.springframework.data.neo4j.support.mapping.Neo4jPersistentPropertyImpl.<init>(Neo4JPersistentPropertyImpl.java:80)
    at org.springframework.data.neo4j.support.mapping.Neo4jMappingContext.createPersistentProperty(Neo4jMappingContext.java:161)
    at org.springframework.data.neo4j.support.mapping.Neo4jMappingContext.createPersistentProperty(Neo4jMappingContext.java:49)
    at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.createAndRegisterProperty(AbstractMappingContext.java:449)
    at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.doWith(AbstractMappingContext.java:427)
    at org.springframework.util.ReflectionUtils.doWithFields(ReflectionUtils.java:606)
    at org.springframework.data.mapping.context.AbstractMappingContext.addPersistentEntity(AbstractMappingContext.java:295)
    at org.springframework.data.neo4j.support.mapping.Neo4jMappingContext.addPersistentEntity(Neo4jMappingContext.java:69)
    at org.springframework.data.neo4j.support.mapping.Neo4jMappingContext.addPersistentEntity(Neo4jMappingContext.java:49)
    at org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:181)
    at org.springframework.data.neo4j.mapping.RelationshipInfo.<init>(RelationshipInfo.java:65)
    at org.springframework.data.neo4j.mapping.RelationshipInfo.fromField(RelationshipInfo.java:79)
    at org.springframework.data.neo4j.support.mapping.Neo4jPersistentPropertyImpl.extractRelationshipInfo(Neo4JPersistentPropertyImpl.java:128)
    at org.springframework.data.neo4j.support.mapping.Neo4jPersistentPropertyImpl.<init>(Neo4JPersistentPropertyImpl.java:80)
    at org.springframework.data.neo4j.support.mapping.Neo4jMappingContext.createPersistentProperty(Neo4jMappingContext.java:161)
    at org.springframework.data.neo4j.support.mapping.Neo4jMappingContext.createPersistentProperty(Neo4jMappingContext.java:49)
    at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.createAndRegisterProperty(AbstractMappingContext.java:449)
    at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.doWith(AbstractMappingContext.java:427)
    at org.springframework.util.ReflectionUtils.doWithFields(ReflectionUtils.java:606)
    at org.springframework.data.mapping.context.AbstractMappingContext.addPersistentEntity(AbstractMappingContext.java:295)
    at org.springframework.data.neo4j.support.mapping.Neo4jMappingContext.addPersistentEntity(Neo4jMappingContext.java:69)
    at org.springframework.data.neo4j.support.mapping.Neo4jMappingContext.addPersistentEntity(Neo4jMappingContext.java:49)
    at org.springframework.data.mapping.context.AbstractMappingContext.addPersistentEntity(AbstractMappingContext.java:257)
    at org.springframework.data.mapping.context.AbstractMappingContext.initialize(AbstractMappingContext.java:373)
    at org.springframework.data.neo4j.support.mapping.Neo4jMappingContext.initialize(Neo4jMappingContext.java:111)
    at org.springframework.data.mapping.context.AbstractMappingContext.afterPropertiesSet(AbstractMappingContext.java:363)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1613)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1550)
    ... 160 more

【问题讨论】：

  • 您能否在帖子顶部明确说明您的问题，以便其他人更容易解决您的问题。谢谢

标签： spring-mvc spring-boot spring-data-neo4j


【解决方案1】：

我为存储库使用了@Lazy 注释来延迟对存储库的引用，因为存储库在启动的后期才正确启动。这允许将存储库引用延迟到需要且可用为止。

@Autowired
@Lazy
BrandRepository brandRepository;

【讨论】：

  • 这可行，但似乎不是一个优雅的解决方案。如果你找到更干净的东西，我很想知道
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