Weblogic deployment failed, and the following errors have been reported continuously

  mongodb, question

Keyword:NoClassDefFoundError : com/mongodb/ChangeEvent

2015-10-26 17:32:31 com.mongodb.ServerMonitor$ServerMonitorRunnable run
 Warning: exception in monitorthreadnotification of serverstatechange
 java.lang.NoClassDefFoundError: com/mongodb/ChangeEvent
 at com.mongodb.ServerMonitor$ServerMonitorRunnable.run(ServerMonitor.java:114)
 at java.lang.Thread.run(Thread.java:619)
 2015-10-26 17:32:37 com.mongodb.ServerMonitor$ServerMonitorRunnable run
 Warning: exception in monitorthreadnotification of serverstatechange
 java.lang.NoClassDefFoundError: com/mongodb/ChangeEvent
 at com.mongodb.ServerMonitor$ServerMonitorRunnable.run(ServerMonitor.java:114)
 at java.lang.Thread.run(Thread.java:619)
 2015-10-26 17:32:44 com.mongodb.ServerMonitor$ServerMonitorRunnable run
 Warning: exception in monitorthreadnotification of serverstatechange
 java.lang.NoClassDefFoundError: com/mongodb/ChangeEvent
 at com.mongodb.ServerMonitor$ServerMonitorRunnable.run(ServerMonitor.java:114)
 at java.lang.Thread.run(Thread.java:619)

Is there any class under the bag?