I configured slf4j and morphia in the project

  <dependency>
            <groupId>org.mongodb.morphia</groupId>
            <artifactId>morphia</artifactId>
            <version>1.3.1</version>
        </dependency>
        <!-- slf4j -->
        <dependency>
                 <groupId>org.slf4j</groupId>
                 <artifactId>slf4j-simple</artifactId>
                 <version>1.7.5</version>
             </dependency> 

Log configuration is as follows

   private static Logger logger = LoggerFactory.getLogger(MongodbTest.class);
    /**
     * 
     */
    @Test
    public void testSlf4j(){
        logger.debug("lalalala");
        logger.warn("lalala");
        logger.info("lalala");
    }

the following is the output

 23, 2018 3:59:18  org.mongodb.morphia.logging.MorphiaLoggerFactory chooseLoggerFactory
: LoggerImplFactory set to org.mongodb.morphia.logging.jdk.JDKLoggerFactory
[main] INFO org.springframework.beans.factory.xml.XmlBeanDefinitionReader - Loading XML bean definitions from class path resource [springconfig.xml]
[main] INFO org.springframework.context.support.GenericApplicationContext - Refreshing org.springframework.context.support.GenericApplicationContext@9597028: startup date [Mon Apr 23 15:59:19 CST 2018]; root of context hierarchy
[main] WARN shenzhen.MongodbTest - lalala
[main] INFO shenzhen.MongodbTest - lalala

Why did slf4j choose morphia logs instead of slf4j simple logs