# Logstash error JSON

**URL:** <https://discuss.elastic.co/t/logstash-error-json/59827>\
**Category:** Logstash\
**Created:** [September 5, 2016, 4:04pm UTC](https://discuss.elastic.co/t/logstash-error-json/59827 "2016-09-05T16:04:41Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Jose\_Campos](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jose_campos/32/11259_2.png) [@Jose\_Campos](https://discuss.elastic.co/u/Jose_Campos)\
**Post date:** [September 5, 2016, 4:04pm UTC](https://discuss.elastic.co/t/logstash-error-json/59827/1 "2016-09-05T16:04:41Z")

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Hi there

Can you help me with this issue?

LogStash::Json::GeneratorError: Cannot find Serializer for class: org.jruby.RubyObject

Waiting for your comments.

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<div class="post-metadata">

**Author:** ![magnusbaeck](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/magnusbaeck/32/44943_2.png) [@magnusbaeck](https://discuss.elastic.co/u/magnusbaeck)\
**Post date:** [September 5, 2016, 6:45pm UTC](https://discuss.elastic.co/t/logstash-error-json/59827/2 "2016-09-05T18:45:13Z")

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What's your configuration? What does the event that Logstash complains about look like?

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**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, 4:39am UTC](https://discuss.elastic.co/t/logstash-error-json/59827/3 "2017-07-06T04:39:48Z")

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Closed on July 6, 2017, 4:39am UTC