# Warnings when installing logstash?

**URL:** <https://discuss.elastic.co/t/warnings-when-installing-logstash/203201>\
**Category:** Logstash\
**Created:** [October 11, 2019, 9:35am UTC](https://discuss.elastic.co/t/warnings-when-installing-logstash/203201 "2019-10-11T09:35:59Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![hanserik](https://avatars.discourse-cdn.com/v4/letter/h/d26b3c/32.png) [@hanserik](https://discuss.elastic.co/u/hanserik)\
**Post date:** [October 11, 2019, 9:35am UTC](https://discuss.elastic.co/t/warnings-when-installing-logstash/203201/1 "2019-10-11T09:35:59Z")

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When installling release 7.4 of logstash, I get below warnings. Do I need to be concerned? What needs to be done?

OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.  
WARNING: An illegal reflective access operation has occurred  
WARNING: Illegal reflective access by com.headius.backport9.modules.Modules to method java.lang.Object.finalize()  
WARNING: Please consider reporting this to the maintainers of com.headius.backport9.modules.Modules  
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations  
WARNING: All illegal access operations will be denied in a future release  
/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/pleaserun-0.0.30/lib/pleaserun/platform/base.rb:112: warning: constant ::Fixnum is deprecated  
Successfully created system startup script for Logstash

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**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [October 11, 2019, 3:12pm UTC](https://discuss.elastic.co/t/warnings-when-installing-logstash/203201/2 "2019-10-11T15:12:16Z")

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Those are expected. You do not need to be concerned.

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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:** [November 8, 2019, 3:12pm UTC](https://discuss.elastic.co/t/warnings-when-installing-logstash/203201/3 "2019-11-08T15:12:19Z")

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