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This exception has no message.
java.lang.NullPointerException: 	at java.lang.Class.isAssignableFrom(Native Method)	at com.mongodb.DBCollectionObjectFactory.isReflectionDBObject(DBCollectionObjectFactory.java:86)	at com.mongodb.DBCollectionObjectFactory.update(DBCollectionObjectFactory.java:61)	at com.mongodb.DBCollection.setObjectClass(DBCollection.java:1888)