使用@EnableMongoAuditing时找不到类型类的PersistentEntity

Question

当我与MongoRepository一起使用功能时，出现“ 找不到类型类的PersistentEntity ”错误@EnableMongoAuditing。当数据库中不存在集合时我保存文档时会发生这种情况。

我尝试了以下内容：

• https://github.com/spring-projects/spring-boot/issues/12023
• https://jira.spring.io/browse/DATAMONGO-1999
• Spring Boot MongoDB审计错误

但没有任何效果。

提到的是：

通过AbstractMongoConfiguration扩展MongoConfig并覆盖所有方法。

这是我的代码，它重现了相同的错误：

MongoConfig类

@Configuration
public class MongoConfig extends AbstractMongoConfiguration {

    @Value("${spring.data.mongodb.host}")
    private String mongoHost;

    @Value("${spring.data.mongodb.port}")
    private String mongoPort;

    @Value("${spring.data.mongodb.database}")
    private String mongoDB;

    @Override
    public MongoDbFactory mongoDbFactory() {
        return new SimpleMongoDbFactory(new MongoClient(mongoHost + ":" + mongoPort), mongoDB);
    }

    @Override
    public MongoClient mongoClient() {
        return new MongoClient(mongoHost, Integer.parseInt(mongoPort));
    }

    @Override
    public MongoTemplate mongoTemplate() {
        return new MongoTemplate(mongoDbFactory());
    }

    @Override
    public MappingMongoConverter mappingMongoConverter() {
        return new MappingMongoConverter(new DefaultDbRefResolver(mongoDbFactory()), new MongoMappingContext());
    }

    @Override
    protected String getDatabaseName() {
        return mongoDB;
    }
}

人员集合类

@Document
public class Person {
    @Id
    private String id;

    private String name;

    @CreatedDate
    private LocalDateTime createdAt;
    @LastModifiedDate
    private LocalDateTime lastModified;
    // Getter Setters Constructors omitted for brevity
}

主要应用类别

@EnableMongoAuditing
@EnableMongoRepositories ({"com.example.*", "org.apache.*"})
@SpringBootApplication
@ComponentScan({"com.example.*", "org.apache.*"})
public class DemoApplication implements CommandLineRunner {

    @Autowired
    PersonRepository personRepository;
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @Override
    public void run(String... args) throws Exception {
        Person p1 = new Person("1", "prakhar");
        personRepository.save(p1);

    }
}

预期结果是Person实体应保存在数据库中。实际结果是“ 找不到类型类Person的PersistentEntity ”错误

Answer 1

看起来你遇到了https://github.com/spring-projects/spring-boot/issues/12023

扩展 AbstractMongoConfiguration 将关闭 Spring Boot 对各种 Mongo 组件的自动配置，并自定义用于扫描映射的基础包。我建议你不要在 Spring Boot 中使用它。

更新

我设法让示例运行，配置很简单

@Configuration
public class MongoConfig {

    @Value("${spring.data.mongodb.host}")
    private String mongoHost;

    @Value("${spring.data.mongodb.port}")
    private String mongoPort;

    @Value("${spring.data.mongodb.database}")
    private String mongoDB;

    @Bean
    public MongoDbFactory mongoDbFactory() {
        return new SimpleMongoDbFactory(new MongoClient(mongoHost + ":" + mongoPort), mongoDB);
    }

    @Bean
    public MongoClient mongoClient() {
        return new MongoClient(mongoHost, Integer.parseInt(mongoPort));
    }
}

和应用程序类

@EnableMongoAuditing
@SpringBootApplication
public class DemoApplication implements CommandLineRunner {

    @Autowired
    PersonRepository personRepository;
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

    @Override
    public void run(String... args) throws Exception {
        Thread.sleep(2000);
        Person p1 = new Person("1", "prakhar");
        personRepository.save(p1);

    }
}

请注意，我遵循了自己的建议，并没有继承自AbstractMongoConfiguration

解释

问题出在初始化

@Bean
public MappingMongoConverter mappingMongoConverter() {
    return new MappingMongoConverter(new DefaultDbRefResolver(mongoDbFactory()), new MongoMappingContext());
}

您只需调用MongoMappingContext构造函数，而不调用setInitialEntitySet. 将其与MongoDataConfiguration自动配置类进行比较。

@Bean
@ConditionalOnMissingBean
public MongoMappingContext mongoMappingContext(MongoCustomConversions conversions)
        throws ClassNotFoundException {
    MongoMappingContext context = new MongoMappingContext();
    context.setInitialEntitySet(new EntityScanner(this.applicationContext)
            .scan(Document.class, Persistent.class));
    Class<?> strategyClass = this.properties.getFieldNamingStrategy();
    if (strategyClass != null) {
        context.setFieldNamingStrategy(
                (FieldNamingStrategy) BeanUtils.instantiateClass(strategyClass));
    }
    context.setSimpleTypeHolder(conversions.getSimpleTypeHolder());
    return context;
}

更糟糕的是，您没有注册MongoMappingContext为托管 bean。因此，仍然会创建自动配置类。AbstractMappingContext.addPersistentEntity这导致了竞争条件，我尝试运行原始代码并且可以轻松地重现错误，但测试中的断点总是通过。