spring data mongo 和 langchain4j mongo atlas 之间的 Maven 依赖问题

Question

我正在尝试将 LangChain4j 集成到我的 Spring Boot 应用程序中，顺便说一句，该应用程序正在使用 Spring Data mongo。我意识到（显然）的一件事是我不想使用内存存储 bur，而是使用 RAG 的 mongo 存储。这就是我面临错误的地方，我不知道如何解决它。详情如下：

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>3.3.6</version>
</parent>

<dependencies>
    <dependency>
        <groupId>com.vaadin</groupId>
        <!-- Replace artifactId with vaadin-core to use only free components -->
        <artifactId>vaadin</artifactId>
    </dependency>
    <dependency>
        <groupId>com.vaadin</groupId>
        <artifactId>vaadin-spring-boot-starter</artifactId>
    </dependency>
    <dependency>
        <groupId>org.parttio</groupId>
        <artifactId>line-awesome</artifactId>
        <version>2.1.0</version>
    </dependency>

    <dependency>
        <groupId>com.h2database</groupId>
        <artifactId>h2</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-mongodb</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-validation</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>com.vaadin</groupId>
        <artifactId>vaadin-testbench-junit5</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>dev.langchain4j</groupId>
        <artifactId>langchain4j</artifactId>
        <version>0.36.2</version>
    </dependency>
    <dependency>
        <groupId>dev.langchain4j</groupId>
        <artifactId>langchain4j-spring-boot-starter</artifactId>
        <version>0.32.0</version>
    </dependency>
    <dependency>
        <groupId>dev.langchain4j</groupId>
        <artifactId>langchain4j-easy-rag</artifactId>
        <version>0.36.2</version>
    </dependency>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.vaadin.addons.flowingcode</groupId>
        <artifactId>chat-assistant-addon</artifactId>
        <version>2.0.0</version>
    </dependency>
    <dependency>
        <groupId>dev.langchain4j</groupId>
        <artifactId>langchain4j-ollama</artifactId>
        <version>0.36.2</version>
    </dependency>
    <dependency>
        <groupId>dev.langchain4j</groupId>
        <artifactId>langchain4j-mongodb-atlas</artifactId>
        <version>0.36.2</version>
    </dependency>
    <dependency>
        <groupId>dev.langchain4j</groupId>
        <artifactId>langchain4j-open-ai-spring-boot-starter</artifactId>
        <version>0.36.2</version>
    </dependency>
</dependencies>

当我执行应用程序时，由于以下错误而无法启动：

APPLICATION FAILED TO START
***************************

Description:

An attempt was made to call a method that does not exist. The attempt was made from the following location:

    dev.langchain4j.store.embedding.mongodb.MongoDbEmbeddingStore.isCollectionExist(MongoDbEmbeddingStore.java:337)

The following method did not exist:

    'com.mongodb.client.MongoIterable com.mongodb.client.MongoDatabase.listCollectionNames()'

The calling method's class, dev.langchain4j.store.embedding.mongodb.MongoDbEmbeddingStore, was loaded from the following location:

    jar:file:/home/cholordo/.m2/repository/dev/langchain4j/langchain4j-mongodb-atlas/0.36.2/langchain4j-mongodb-atlas-0.36.2.jar!/dev/langchain4j/store/embedding/mongodb/MongoDbEmbeddingStore.class

The called method's class, com.mongodb.client.MongoDatabase, is available from the following locations:

    jar:file:/home/cholordo/.m2/repository/org/mongodb/mongodb-driver-sync/5.0.1/mongodb-driver-sync-5.0.1.jar!/com/mongodb/client/MongoDatabase.class

The called method's class hierarchy was loaded from the following locations:

    com.mongodb.client.MongoDatabase: file:/home/cholordo/.m2/repository/org/mongodb/mongodb-driver-sync/5.0.1/mongodb-driver-sync-5.0.1.jar


Action:

Correct the classpath of your application so that it contains compatible versions of the classes dev.langchain4j.store.embedding.mongodb.MongoDbEmbeddingStore and com.mongodb.client.MongoDatabase ```

This is triggers while creating the Embedded Mongo store in this part:





    @Bean
    public EmbeddingStore embeddingStore(){
        String uri = "mongodb://root:[email protected]:27017/admin?authSource=admin";
        MongoClient mongoClient = MongoClients.create(uri);
        return new MongoDbEmbeddingStore.Builder().indexName("wildcatProIndex")
                .fromClient(mongoClient)
                .collectionName("ingested_documents")
                .databaseName("admin")
                .build();
    }

More precisely in this part:

        if (!this.isCollectionExist(database, collectionName)) {
            this.createCollection(database, collectionName, (CreateCollectionOptions)Utils.getOrDefault(createCollectionOptions, new CreateCollectionOptions()));
        }

Can any give me guidance on this ?.I have problems structuring the post so I apology... 

Answer 1

这是一个依赖版本兼容性问题。 langchain4j-mongodb-atlas 方法在当前 MongoDB 驱动版本中不可用。

让我们通过检查您的 pom.xml 来解决此问题：

1. 首先，在

   <properties>

   部分显式指定MongoDB驱动程序版本：

<properties>
    <mongodb-driver-sync.version>4.11.1</mongodb-driver-sync.version>
</properties>

2. 确保依赖版本一致性。修改依赖：

<dependencies>
    <!-- Remove or comment out the existing spring-boot-starter-data-mongodb -->
    <!--
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-mongodb</artifactId>
    </dependency>
    -->
    
    <!-- Add these dependencies -->
    <dependency>
        <groupId>org.mongodb</groupId>
        <artifactId>mongodb-driver-sync</artifactId>
        <version>${mongodb-driver-sync.version}</version>
    </dependency>
    
    <!-- Ensure all langchain4j related dependencies use the same version -->
    <dependency>
        <groupId>dev.langchain4j</groupId>
        <artifactId>langchain4j-spring-boot-starter</artifactId>
        <version>0.36.2</version>  <!-- Update to match other langchain4j dependencies -->
    </dependency>
</dependencies>

3. 如果您还需要 Spring Data MongoDB，请像这样配置：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-mongodb</artifactId>
    <exclusions>
        <exclusion>
            <groupId>org.mongodb</groupId>
            <artifactId>mongodb-driver-sync</artifactId>
        </exclusion>
    </exclusions>
</dependency>

主要变化：

1. 显式指定 MongoDB 驱动程序版本
2. 将所有langchain4j依赖统一到0.36.2版本
3. 避免 MongoDB 驱动版本冲突

如果问题仍然存在，请尝试：

1. 清理 Maven 缓存：

mvn clean
rm -rf ~/.m2/repository/org/mongodb
mvn dependency:purge-local-repository

2. 重建项目：

mvn clean install

如果仍然遇到问题，请考虑将 langchain4j-mongodb-atlas 降级到早期版本（如 0.35.0）进行测试。

错误信息显示当前MongoDB驱动版本中不存在

listCollectionNames()

方法。此方法在较新版本的驱动程序中可用，这就是我们需要更新依赖项的原因。

您的 Bean 配置本身看起来是正确的。该问题仅与依赖项版本兼容性有关。