Correct the classpath of your application so that it contains a single, comp

<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongodb-driver-sync</artifactId>
    <version>${mongodb.version}</version>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>

父模块中同时引入了这两个依赖导致冲突，移除一个，保留springboot的