java.lang.IllegalArgumentException: filename can not be null
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at com.mongodb.assertions.Assertions.notNull(Assertions.java:37) ~[mongo-java-driver-3.2.2.jar:na]
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at com.mongodb.client.gridfs.model.GridFSFile.<init>(GridFSFile.java:81) ~[mongo-java-driver-3.2.2.jar:na]
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at com.mongodb.client.gridfs.model.GridFSFile.<init>(GridFSFile.java:61) ~[mongo-java-driver-3.2.2.jar:na]
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at com.mongodb.client.gridfs.GridFSFindIterableImpl$1.apply(GridFSFindIterableImpl.java:143) ~[mongo-java-driver-3.2.2.jar:na]
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at com.mongodb.client.gridfs.GridFSFindIterableImpl$1.apply(GridFSFindIterableImpl.java:122) ~[mongo-java-driver-3.2.2.jar:na]
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at com.mongodb.MongoMappingCursor.next(MongoMappingCursor.java:44) ~[mongo-java-driver-3.2.2.jar:na]
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at com.mongodb.MappingIterable.first(MappingIterable.java:45) ~[mongo-java-driver-3.2.2.jar:na]
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at com.mongodb.client.gridfs.GridFSFindIterableImpl.first(GridFSFindIterableImpl.java:102) ~[mongo-java-driver-3.2.2.jar:na]
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at com.mongodb.client.gridfs.GridFSFindIterableImpl.first(GridFSFindIterableImpl.java:45) ~[mongo-java-driver-3.2.2.jar:na]
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at com.mongodb.client.gridfs.GridFSBucketImpl.findTheFileInfoAndOpenDownloadStream(GridFSBucketImpl.java:292) ~[mongo-java-driver-3.2.2.jar:na]
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at com.mongodb.client.gridfs.GridFSBucketImpl.openDownloadStream(GridFSBucketImpl.java:161)
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