无法为 AxonFramework 创建 MongoEventStorageEngine Bean

如何解决无法为 AxonFramework 创建 MongoEventStorageEngine Bean

我正在学习有关 CQRS 和 EventSourcing 项目的基本教程。完整教程项目的源码中只有一个配置类来为项目配置Axon框架，代码如下：

import com.mongodb.MongoClient;
import org.axonframework.eventsourcing.eventstore.EventStorageEngine;
import org.axonframework.extensions.mongo.DefaultMongoTemplate;
import org.axonframework.extensions.mongo.eventsourcing.eventstore.MongoEventStorageEngine;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class AxonConfig {
        @Bean
        public EventStorageEngine storageEngine(MongoClient client) {
            return MongoEventStorageEngine
                    .builder()
                    .mongoTemplate(DefaultMongoTemplate
                            .builder()
                            .mongoDatabase(client)
                            .build())
                    .build();
        }

}

但是，这对我不起作用，IDE 警告说它无法自动装配 MongoClient，找不到 MongoClient Bean，这里：

.mongoDatabase(mongoClient)

IDE 建议我将 com.mongodb.MongoClient 转换为 com.mongodb.client.MongoClient

.mongoDatabase((com.mongodb.client.MongoClient) mongoClient)

但是，如果我尝试将 AxonConfig 更改为使用 com.mongodb.client.MongoClient，如下所示：

@Configuration
public class AxonConfig {

    @Bean
    public EventStorageEngine storageEngine(com.mongodb.client.MongoClient mongoClient) {
        return MongoEventStorageEngine
                .builder()
                .mongoTemplate(DefaultMongoTemplate
                        .builder()
                        .mongoDatabase(mongoClient)
                        .build())
                .build();
    }
}

然后它可以自动装配 MongoClient 并成功编译，但是当我启动应用程序时它失败了，我得到了这个输出：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'storageEngine' defined in class path resource [com/placidmasvidal/cqrsandeventsourcing/command/AxonConfig.class]: Unsatisfied dependency expressed through method 'storageEngine' parameter 0; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'mongo' defined in class path resource [org/springframework/boot/autoconfigure/mongo/MongoAutoConfiguration.class]: Unsatisfied dependency expressed through method 'mongo' parameter 1; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mongoClientSettings' defined in class path resource [org/springframework/boot/autoconfigure/mongo/MongoAutoConfiguration$MongoClientSettingsConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.mongodb.MongoClientSettings]: Factory method 'mongoClientSettings' threw exception; nested exception is java.lang.NoSuchFieldError: DEFAULT_BSON_TYPE_CLASS_MAP
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:800) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:541) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1334) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:944) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:917) ~[spring-context-5.3.4.jar:5.3.4]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:582) ~[spring-context-5.3.4.jar:5.3.4]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144) ~[spring-boot-2.4.3.jar:2.4.3]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:767) ~[spring-boot-2.4.3.jar:2.4.3]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) ~[spring-boot-2.4.3.jar:2.4.3]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426) ~[spring-boot-2.4.3.jar:2.4.3]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:326) ~[spring-boot-2.4.3.jar:2.4.3]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1311) ~[spring-boot-2.4.3.jar:2.4.3]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1300) ~[spring-boot-2.4.3.jar:2.4.3]
    at com.placidmasvidal.cqrsandeventsourcing.command.CommandApplication.main(CommandApplication.java:10) ~[main/:na]
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'mongo' defined in class path resource [org/springframework/boot/autoconfigure/mongo/MongoAutoConfiguration.class]: Unsatisfied dependency expressed through method 'mongo' parameter 1; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mongoClientSettings' defined in class path resource [org/springframework/boot/autoconfigure/mongo/MongoAutoConfiguration$MongoClientSettingsConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.mongodb.MongoClientSettings]: Factory method 'mongoClientSettings' threw exception; nested exception is java.lang.NoSuchFieldError: DEFAULT_BSON_TYPE_CLASS_MAP
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:800) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:541) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1334) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:887) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791) ~[spring-beans-5.3.4.jar:5.3.4]
    ... 20 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mongoClientSettings' defined in class path resource [org/springframework/boot/autoconfigure/mongo/MongoAutoConfiguration$MongoClientSettingsConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.mongodb.MongoClientSettings]: Factory method 'mongoClientSettings' threw exception; nested exception is java.lang.NoSuchFieldError: DEFAULT_BSON_TYPE_CLASS_MAP
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:486) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1334) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:887) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:791) ~[spring-beans-5.3.4.jar:5.3.4]
    ... 34 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.mongodb.MongoClientSettings]: Factory method 'mongoClientSettings' threw exception; nested exception is java.lang.NoSuchFieldError: DEFAULT_BSON_TYPE_CLASS_MAP
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.3.4.jar:5.3.4]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ~[spring-beans-5.3.4.jar:5.3.4]
    ... 48 common frames omitted
Caused by: java.lang.NoSuchFieldError: DEFAULT_BSON_TYPE_CLASS_MAP
    at org.bson.codecs.MapCodecProvider.<init>(MapCodecProvider.java:61) ~[bson-4.1.1.jar:na]
    at com.mongodb.MongoClientSettings.<clinit>(MongoClientSettings.java:60) ~[mongodb-driver-core-4.1.1.jar:na]
    at org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration$MongoClientSettingsConfiguration.mongoClientSettings(MongoAutoConfiguration.java:64) ~[spring-boot-autoconfigure-2.4.3.jar:2.4.3]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.3.4.jar:5.3.4]
    ... 49 common frames omitted

解决方法

这花了一些时间，但我想在回复你之前让我做一些事情，这就是我所做的。我在 example 存储库中添加了一个 extension-mongo，您至少可以在其中检查一个简单的工作示例。目前仍然是 PR，但很快就会被合并（我应该回到答案并更新它）。

但基本上，这是我需要提供的配置：

// omitting the other imports just to have a smaller code block
import com.mongodb.client.MongoClient

    /**
     * Configures Mongo as the Storage Engine.
     */
    @Bean
    fun storageEngine(client: MongoClient) = MongoEventStorageEngine.builder()
        .mongoTemplate(
            DefaultMongoTemplate.builder()
                .mongoDatabase(client)
                .build()
        )
        .build()

    /**
     * Configures to use Mongo embedded event store.
     */
    @Bean
    fun eventStore(storageEngine: EventStorageEngine) = EmbeddedEventStore.builder().storageEngine(storageEngine).build()

    /**
     * Configures to use in-memory token store.
     */
    @Bean
    fun tokenStore(client: MongoClient,serializer: Serializer) = MongoTokenStore.builder()
        .mongoTemplate(
            DefaultMongoTemplate.builder()
                .mongoDatabase(client)
                .build()
        )
        .serializer(serializer)
        .build()

根据我的依赖，我只需要扩展本身：

<dependency>
    <groupId>org.axonframework.extensions.mongo</groupId>
    <artifactId>axon-mongo</artifactId>
    <version>${project.version}</version>
</dependency>

指出我正在使用 spring-boot 2.4.3。

希望它能帮助你找到站在你这边的罪魁祸首！

com.mongodb.client.MongoClient 类是新 API，可能与您使用的 Axon 框架版本不兼容。

要使其工作，您可能需要降级 Mongo 依赖项 (spring-boot-starter-data-mongodb) 并使用旧 API import com.mongodb.MongoClient。

无法为 AxonFramework 创建 MongoEventStorageEngine Bean

如何解决无法为 AxonFramework 创建 MongoEventStorageEngine Bean

解决方法

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