Can't create MongoEventStorageEngine Bean for AxonFramework

Question

I am following a basic tutorial for a project with CQRS and EventSourcing. In the source code of the full tutorial project there is only one configuration class to configure Axon framework for the project, the code is as follows:

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();
        }

}

However, this is not working for me, the IDE warns that it cannot autowire MongoClient, no MongoClient Beans are found, and here:

.mongoDatabase(mongoClient)

The IDE suggests me to cast com.mongodb.MongoClient to com.mongodb.client.MongoClient

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

But if I try to change that AxonConfig to use com.mongodb.client.MongoClient instead, as follows:

@Configuration
public class AxonConfig {

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

then it can autowire MongoClient and compile successfully, but when I launch the application it fails and I'm getting this output:

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.(MapCodecProvider.java:61) ~[bson-4.1.1.jar:na]
    at com.mongodb.MongoClientSettings.(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

user_4437909 · Answer

It took some time, but I wanted to have something working on my side before getting back to you and this is what I did. I've added an example to the extension-mongo repo where you can check at least a simple working sample. Still currently a PR but soon to be merged (and I should get back to the answer and update it).

But basically, this is the config I needed to provide:

// 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()

and on my dependency, I only needed the extension itself:


    org.axonframework.extensions.mongo
    axon-mongo
    ${project.version}

Pointing that I am using spring-boot 2.4.3.

Hope it helps you to find the culprit on your side!

user_980852 · Answer

The com.mongodb.client.MongoClient class is the new API and probably is not compatible with the version of Axon Framework that you are using.

To make it work you may need to downgrade your Mongo dependency (spring-boot-starter-data-mongodb) and use the legacy API import com.mongodb.MongoClient.

Can't create MongoEventStorageEngine Bean for AxonFramework

2 Answers