使用@EnableMongoAuditing 时找不到类型 class 的 PersistentEntity

Question

当我将 @EnableMongoAuditing 功能与 MongoRepository 一起使用时，出现“无法找到 class 类型的 PersistentEntity”错误。当我在数据库中不存在集合时保存文档时会发生这种情况。

我尝试了以下提到的任何方法：

https://github.com/spring-projects/spring-boot/issues/12023
https://jira.spring.io/browse/DATAMONGO-1999
Spring boot mongodb auditing error

但没有任何效果。

提到的东西是：

通过 AbstractMongoConfiguration 扩展 MongoConfig 并覆盖所有方法。

这是我的代码，它重现了同样的错误：

MongoConfig class

@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;
    }
}

人物合集class

@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
}

主应用程序class

@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 实体应该保存在数据库中。实际结果是“找不到类型 class Person 的 PersistentEntity”错误

Answer 1

看起来你运行变成了 https://github.com/spring-projects/spring-boot/issues/12023

Extending AbstractMongoConfiguration will switch off Spring Boot's auto-configuration of various Mongo components and also customises the base packages that are used to scan for mappings. I would recommend that you don't use it in Spring Boot.

更新

我设法得到了示例运行配置就像

一样简单

@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 class

@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

说明

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 class.

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，您没有将 MongoMappingContext 注册为托管 bean。由于这个事实，自动配置 class 仍然被创建。这导致了竞争条件，我尝试运行原始代码并且可以很容易地重现错误，但是在 AbstractMappingContext.addPersistentEntity 中有一个断点，测试总是通过。

Answer 2

对我来说，如果您的 class 从 AbstractMongoConfiguration

扩展，我通过在 MongoConfig 中添加以下方法解决了这个问题

@Override
protected String getMappingBasePackage() {
 return "com.companyName.modulename"

}

如果 MongoConfig 从 MongoConfigurationSupport 扩展，则添加下面的方法

@Override
protected Collection<String> getMappingBasePackages() {
    return Arrays.asList("com.companyName.module1","com.companyName.module2");
}

请注意，在以后的情况下，我可以将多个包名称指定为基础包。

使用@EnableMongoAuditing 时找不到类型 class 的 PersistentEntity

Couldn't find PersistentEntity for type class when using @EnableMongoAuditing

spring-data-mongodb

spring-boot