我在使用crcmnky的存储库进行电影推荐工作。https://github.com/crcsmnky/mongodb-spark-demo 我已经编译了mongohadoop和mongojava驱动程序，并将jar:mongo-hadoop-core-1.3.2-snapshot和mongo-java-driver-2.13.3.jar存储在$hadoop\u home/lib文件夹中。完成所有这些之后，我构建了这个项目，并按照自述文件中给出的说明运行它。我得到一个错误：

Exception in thread "main" java.lang.NoClassDefFoundError: com/mongodb/hadoop/BSONFileInputFormat
at com.mongodb.spark.demo.Recommender.main(Recommender.java:59)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.apache.spark.deploy.SparkSubmit$.launch(SparkSubmit.scala:358)
at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:75)
at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.lang.ClassNotFoundException: com.mongodb.hadoop.BSONFileInputFormat
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

可能出了什么问题？我正确地遵循了所有的指示。