# Following just regular installer instructions: Error: Could not find or load main class org.jruby.Main **URL:** \ **Category:** Logstash\ **Created:** [January 7, 2018, 8:54pm UTC](https://discuss.elastic.co/t/following-just-regular-installer-instructions-error-could-not-find-or-load-main-class-org-jruby-main/114426 "2018-01-07T20:54:12Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Kieren\_Johnstone](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kieren_johnstone/32/26311_2.png) [@Kieren\_Johnstone](https://discuss.elastic.co/u/Kieren_Johnstone)\ **Post date:** [January 7, 2018, 8:54pm UTC](https://discuss.elastic.co/t/following-just-regular-installer-instructions-error-could-not-find-or-load-main-class-org-jruby-main/114426/1 "2018-01-07T20:54:12Z")
Kierens-MBP:bin kieren$ ./logstash --? Java HotSpot(TM) 64-Bit Server VM warning: Option UseParNewGC was deprecated in version 9.0 and will likely be removed in a future release. Java HotSpot(TM) 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release. Error: Could not find or load main class org.jruby.Main Caused by: java.lang.ClassNotFoundException: org.jruby.Main My pwd doesn't contain any colon. I literally just downloaded and unzipped the latest logstash, installed the JDK as requested, and tried to run an example. I'm following [https://www.elastic.co/blog/getting-started-with-hosted-elasticsearch-v5-and-a-sample-dataset](https://www.elastic.co/blog/getting-started-with-hosted-elasticsearch-v5-and-a-sample-dataset), which clearly a bit dodgy since the git repo it says to use the conf from indicated that's a legacy conf. But I'm not getting that far. Why won't a clean install of logstash run at all, please? ---
**Author:** ![Kieren\_Johnstone](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kieren_johnstone/32/26311_2.png) [@Kieren\_Johnstone](https://discuss.elastic.co/u/Kieren_Johnstone)\ **Post date:** [January 7, 2018, 8:56pm UTC](https://discuss.elastic.co/t/following-just-regular-installer-instructions-error-could-not-find-or-load-main-class-org-jruby-main/114426/2 "2018-01-07T20:56:44Z")
Ok, some more digging, the install pages say Java 9 is not supported. Why then does invoking Logstash and clicking "More info" take me to a page with a big fat Java 9 download button? ---
**Author:** ![Kieren\_Johnstone](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kieren_johnstone/32/26311_2.png) [@Kieren\_Johnstone](https://discuss.elastic.co/u/Kieren_Johnstone)\ **Post date:** [January 7, 2018, 9:02pm UTC](https://discuss.elastic.co/t/following-just-regular-installer-instructions-error-could-not-find-or-load-main-class-org-jruby-main/114426/3 "2018-01-07T21:02:22Z")
Update: Java 8 fails in the same way. ---
**Author:** ![Kieren\_Johnstone](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kieren_johnstone/32/26311_2.png) [@Kieren\_Johnstone](https://discuss.elastic.co/u/Kieren_Johnstone)\ **Post date:** [January 7, 2018, 9:12pm UTC](https://discuss.elastic.co/t/following-just-regular-installer-instructions-error-could-not-find-or-load-main-class-org-jruby-main/114426/4 "2018-01-07T21:12:23Z")
Update.. 'unzip logstash-whatever.zip' on the commandline didn't work, however if I extract the zip using OS X / Finder it's fine. I say fine, I then get: [FATAL] 2018-01-07 21:10:32.722 [main] runner - An unexpected error occurred! {:error=\>#\, :backtrace=\>["/Users/kieren/Downloads/logstash-6.1.1 2/vendor/jruby/lib/ruby/stdlib/uri/rfc3986\_parser.rb:67:in `split'", "/Users/kieren/Downloads/logstash-6.1.1 2/vendor/jruby/lib/ruby/stdlib/uri/rfc3986_parser.rb:73:in`parse'", "/Users/kieren/Downloads/logstash-6.1.1 2/vendor/jruby/lib/ruby/stdlib/uri/rfc3986\_parser.rb:117:in `convert_to_uri'", "/Users/kieren/Downloads/logstash-6.1.1 2/vendor/jruby/lib/ruby/stdlib/uri/rfc3986_parser.rb:88:in`join'", "/Users/kieren/Downloads/logstash-6.1.1 2/vendor/jruby/lib/ruby/stdlib/uri/common.rb:265:in `join'", "/Users/kieren/downloads/logstash-6.1.1 2/logstash-core/lib/logstash/runner.rb:234:in`execute'", "/Users/kieren/downloads/logstash-6.1.1 2/vendor/bundle/jruby/2.3.0/gems/clamp-0.6.5/lib/clamp/command.rb:67:in `run'", "/Users/kieren/downloads/logstash-6.1.1 2/logstash-core/lib/logstash/runner.rb:214:in`run'", "/Users/kieren/downloads/logstash-6.1.1 2/vendor/bundle/jruby/2.3.0/gems/clamp-0.6.5/lib/clamp/command.rb:132:in `run'", "/Users/kieren/downloads/logstash-6.1.1 2/lib/bootstrap/environment.rb:67:in`'"]} Any tips at all? ---
**Author:** ![Kieren\_Johnstone](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/kieren_johnstone/32/26311_2.png) [@Kieren\_Johnstone](https://discuss.elastic.co/u/Kieren_Johnstone)\ **Post date:** [January 7, 2018, 9:13pm UTC](https://discuss.elastic.co/t/following-just-regular-installer-instructions-error-could-not-find-or-load-main-class-org-jruby-main/114426/5 "2018-01-07T21:13:58Z")
Is this - [https://stackoverflow.com/questions/41391781/logstash-5-1-1-bad-uriis-not-uri](https://stackoverflow.com/questions/41391781/logstash-5-1-1-bad-uriis-not-uri) - the answer? Seriously, how frail is this thing? Why doesn't the install guide mention this, yet it mentions colons? ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [February 4, 2018, 9:14pm UTC](https://discuss.elastic.co/t/following-just-regular-installer-instructions-error-could-not-find-or-load-main-class-org-jruby-main/114426/6 "2018-02-04T21:14:02Z")
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