# Failed to send event to MongoDB - NoMethodError **URL:** \ **Category:** Logstash\ **Created:** [October 13, 2016, 8:13am UTC](https://discuss.elastic.co/t/failed-to-send-event-to-mongodb-nomethoderror/62912 "2016-10-13T08:13:59Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![rivaanbechan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/rivaanbechan/32/12900_2.png) [@rivaanbechan](https://discuss.elastic.co/u/rivaanbechan)\ **Post date:** [October 13, 2016, 8:13am UTC](https://discuss.elastic.co/t/failed-to-send-event-to-mongodb-nomethoderror/62912/1 "2016-10-13T08:13:59Z")
Hi, I am able to write to a file or use other outputs. My problem is specific to the mongodb output use case. centos7 MongoDB shell version: 3.2.10 logstash-output-mongodb 2.0.5 winlogbeats 1.3.1 logstash 2.4.0 logstash config: mongodb { collection =\> "mycollection" database =\> "mydb" uri =\> "mongodb://localhost" } I have created a database and a collection. Also able to manually write to it. No authentication required. This is glaring in the log ----- NoMethodError: undefined method `bson\_type' for #Java::JavaUtil::LinkedHashMap:0x7aa06858 ERROR: @metadata\_accessors=#\, @cancelled=false\>, :exception=\>#\>, :backtrace=>["/opt/logstash/vendor/bundle/jruby/1.9/gems/bson-3.2.6-java/lib/bson/hash.rb:44:in`to\_bson'", "org/jruby/RubyHash.java:1342:in `each'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/bson-3.2.6-java/lib/bson/hash.rb:43:in`to\_bson'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/bson-3.2.6-java/lib/bson/encodable.rb:57:in `encode_with_placeholder_and_null'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/bson-3.2.6-java/lib/bson/hash.rb:42:in`to\_bson'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/bson-3.2.6-java/lib/bson/array.rb:49:in `to_bson'", "org/jruby/RubyArray.java:1613:in`each'", "org/jruby/RubyEnumerable.java:974:in `each_with_index'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/bson-3.2.6-java/lib/bson/array.rb:46:in`to\_bson'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/bson-3.2.6-java/lib/bson/encodable.rb:57:in `encode_with_placeholder_and_null'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/bson-3.2.6-java/lib/bson/array.rb:45:in`to\_bson'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/bson-3.2.6-java/lib/bson/hash.rb:46:in `to_bson'", "org/jruby/RubyHash.java:1342:in`each'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/bson-3.2.6-java/lib/bson/hash.rb:43:in `to_bson'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/bson-3.2.6-java/lib/bson/encodable.rb:57:in`encode\_with\_placeholder\_and\_null'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/bson-3.2.6-java/lib/bson/hash.rb:42:in `to_bson'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/protocol/serializers.rb:155:in`serialize'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/protocol/message.rb:153:in `serialize_fields'", "org/jruby/RubyArray.java:1613:in`each'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/protocol/message.rb:141:in `serialize_fields'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/protocol/message.rb:70:in`serialize'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/server/connection.rb:123:in `write'", "org/jruby/RubyArray.java:1613:in`each'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/server/connection.rb:122:in `write'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/server/connectable.rb:66:in`dispatch'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/loggable.rb:44:in `log'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/loggable.rb:43:in`log'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/loggable.rb:67:in `log_debug'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/server/connectable.rb:65:in`dispatch'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/operation/executable.rb:35:in `execute'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/server/connection_pool.rb:99:in`with\_connection'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/server/connection\_pool.rb:97:in `with_connection'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/server/context.rb:63:in`with\_connection'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/operation/executable.rb:34:in `execute'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/operation/write/insert.rb:72:in`execute\_write\_command'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/operation/write/insert.rb:62:in `execute'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/collection.rb:190:in`insert\_many'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/mongo-2.0.6/lib/mongo/collection.rb:175:in `insert_one'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-output-mongodb-2.0.5/lib/logstash/outputs/mongodb.rb:56:in`receive'", "/opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-core-\ **Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 4:34am UTC](https://discuss.elastic.co/t/failed-to-send-event-to-mongodb-nomethoderror/62912/2 "2017-07-06T04:34:26Z")