# Cannot run logstash using cmd please help!

**URL:** <https://discuss.elastic.co/t/cannot-run-logstash-using-cmd-please-help/139426>\
**Category:** Logstash\
**Created:** [July 10, 2018, 8:30pm UTC](https://discuss.elastic.co/t/cannot-run-logstash-using-cmd-please-help/139426 "2018-07-10T20:30:15Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Shraddha\_Srivastav](https://avatars.discourse-cdn.com/v4/letter/s/7ba0ec/32.png) [@Shraddha\_Srivastav](https://discuss.elastic.co/u/Shraddha_Srivastav)\
**Post date:** [July 10, 2018, 8:30pm UTC](https://discuss.elastic.co/t/cannot-run-logstash-using-cmd-please-help/139426/1 "2018-07-10T20:30:15Z")

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Hi,

I installed logstash ZIP folder using [https://www.elastic.co/downloads/logstash](https://www.elastic.co/downloads/logstash). Also prepared a logstash.conf config file, followed the steps as explained on this: [https://www.elastic.co/guide/en/logstash/current/configuration.html](https://www.elastic.co/guide/en/logstash/current/configuration.html). But Im getting the follwing error:

C:\Users\shraddhasrivastav\Downloads\logstash-6.3.1\bin\>logstash -f logstash-simple.conf  
Unrecognized VM option 'UseParNewGC'  
Error: Could not create the Java Virtual Machine.  
Error: A fatal exception has occurred. Program will exit.

Please help to solve.

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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:** [July 10, 2018, 8:44pm UTC](https://discuss.elastic.co/t/cannot-run-logstash-using-cmd-please-help/139426/2 "2018-07-10T20:44:57Z")

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The default jvm.options file assumes that you are running a HotSpot JVM. If you are running something else you may need to adjust it. You could start by just commenting that out. What JVM are you using? (What does 'java -version' produce?)

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**Author:** ![Shraddha\_Srivastav](https://avatars.discourse-cdn.com/v4/letter/s/7ba0ec/32.png) [@Shraddha\_Srivastav](https://discuss.elastic.co/u/Shraddha_Srivastav)\
**Post date:** [July 10, 2018, 9:22pm UTC](https://discuss.elastic.co/t/cannot-run-logstash-using-cmd-please-help/139426/3 "2018-07-10T21:22:14Z")

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HEY,

iAM RUNNING java version 8:

C:\>"C:\Program Files\Java\jdk1.8.0\_171\bin\java" -version  
java version "1.8.0\_171"  
Java(TM) SE Runtime Environment (build 1.8.0\_171-b11)  
Java HotSpot(TM) 64-Bit Server VM (build 25.171-b11, mixed mode)

When i run the logstash command i get error:

C:\Users\shraddhasrivastav\Downloads\logstash-6.3.1\bin\>logstash -f logstash-simple.conf  
could not find java; set JAVA\_HOME or ensure java is in PATH

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<div class="post-metadata">

**Author:** ![Shraddha\_Srivastav](https://avatars.discourse-cdn.com/v4/letter/s/7ba0ec/32.png) [@Shraddha\_Srivastav](https://discuss.elastic.co/u/Shraddha_Srivastav)\
**Post date:** [July 10, 2018, 9:25pm UTC](https://discuss.elastic.co/t/cannot-run-logstash-using-cmd-please-help/139426/4 "2018-07-10T21:25:07Z")

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i even ran  
C:\Users\shraddhasrivastav\Downloads\logstash-6.3.1\bin\>echo %JAVA\_HOME%  
%JAVA\_HOME%

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [August 7, 2018, 9:25pm UTC](https://discuss.elastic.co/t/cannot-run-logstash-using-cmd-please-help/139426/5 "2018-08-07T21:25:11Z")

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