Error when configuring MongoDB data source in SpringBoot

problem:

When configuring MongDB, mongo dependency is introduced

 	<!-- MongoDB依赖 -->
	<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-data-mongodb</artifactId>
		<version>2.3.4.RELEASE</version>
	</dependency>

The following two errors also appeared

import org.springframework.data.mongodb.core.SimpleMongoDbFactory;
import com.mongodb.MongoClient;

Reason: The
mongo version is too new. The two jar packages in the new version have been changed or replaced, so an error will be reported.

Problem solution:
Modify the version, and the introduced MongoDB version is less than 2.0.4.

	 <!-- MongoDB依赖 -->
	<dependency>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-data-mongodb</artifactId>
		<version>2.0.4.RELEASE</version>
	</dependency>