org.springframework.data.mongodb.core.MongoTemplate]: Constructor threw exception; nested exception is java.lang.NoSuchMethodError: org.springframework.core.convert.support.ConversionServiceFactory.cr

  spring-data-mongo 和spring core包冲突。解决办法：

<dependency>
   <groupId>org.springframework.data</groupId>
   <artifactId>spring-data-mongodb</artifactId>
   <version>1.8.2.RELEASE</version>
</dependency>

换成 spring-data-mongodb1.8的即可。