Logstash: not compatible with jdk1.9

[cbwleft]

• Version: logstash-5.6.2，openjdk version "9-internal"
• Operating System: ubuntu16.04 LTS
• Steps to Reproduce:
  I run logstash with bin/logstash -e 'input{stdin{}}output{stdout{codec=>rubydebug}}'，an error occurred says LoadError: Unsupported platform: x86_64-linux
  I paste the full input and output in the following:

`~/Desktop/logstash-5.6.2$ java -version
openjdk version "9-internal"
OpenJDK Runtime Environment (build 9-internal+0-2016-04-14-195246.buildd.src)
OpenJDK 64-Bit Server VM (build 9-internal+0-2016-04-14-195246.buildd.src, mixed mode)
~/Desktop/logstash-5.6.2$ bin/logstash -e 'input{stdin{}}output{stdout{codec=>rubydebug}}'
OpenJDK 64-Bit Server VM warning: Option UseParNewGC was deprecated in version 9.0 and will likely be removed in a future release.
io/console on JRuby shells out to stty for most operations
Sending Logstash's logs to /home/cbwleft/Desktop/logstash-5.6.2/logs which is now configured via log4j2.properties
[2017-10-10T17:37:00,685][INFO ][logstash.modules.scaffold] Initializing module {:module_name=>"netflow", :directory=>"/home/cbwleft/Desktop/logstash-5.6.2/modules/netflow/configuration"}
[2017-10-10T17:37:00,690][INFO ][logstash.modules.scaffold] Initializing module {:module_name=>"fb_apache", :directory=>"/home/cbwleft/Desktop/logstash-5.6.2/modules/fb_apache/configuration"}
[2017-10-10T17:37:00,713][INFO ][logstash.setting.writabledirectory] Creating directory {:setting=>"path.queue", :path=>"/home/cbwleft/Desktop/logstash-5.6.2/data/queue"}
[2017-10-10T17:37:00,733][INFO ][logstash.setting.writabledirectory] Creating directory {:setting=>"path.dead_letter_queue", :path=>"/home/cbwleft/Desktop/logstash-5.6.2/data/dead_letter_queue"}
LoadError: Unsupported platform: x86_64-linux
require at org/jruby/RubyKernel.java:1040
require at /home/cbwleft/Desktop/logstash-5.6.2/vendor/bundle/jruby/1.9/gems/polyglot-0.3.5/lib/polyglot.rb:65
(root) at /home/cbwleft/Desktop/logstash-5.6.2/vendor/jruby/lib/ruby/shared/ffi/ffi.rb:69
require at org/jruby/RubyKernel.java:1040
require at /home/cbwleft/Desktop/logstash-5.6.2/vendor/bundle/jruby/1.9/gems/polyglot-0.3.5/lib/polyglot.rb:65
(root) at /home/cbwleft/Desktop/logstash-5.6.2/vendor/jruby/lib/ruby/shared/ffi.rb:1
require at org/jruby/RubyKernel.java:1040
require at /home/cbwleft/Desktop/logstash-5.6.2/vendor/bundle/jruby/1.9/gems/polyglot-0.3.5/lib/polyglot.rb:65
(root) at /home/cbwleft/Desktop/logstash-5.6.2/vendor/jruby/lib/ruby/shared/ffi.rb:1
(root) at /home/cbwleft/Desktop/logstash-5.6.2/logstash-core/lib/logstash/util/prctl.rb:1
require at org/jruby/RubyKernel.java:1040
require at /home/cbwleft/Desktop/logstash-5.6.2/vendor/bundle/jruby/1.9/gems/polyglot-0.3.5/lib/polyglot.rb:65
LibC at /home/cbwleft/Desktop/logstash-5.6.2/logstash-core/lib/logstash/util/prctl.rb:3
(root) at /home/cbwleft/Desktop/logstash-5.6.2/logstash-core/lib/logstash/util/prctl.rb:2
(root) at /home/cbwleft/Desktop/logstash-5.6.2/logstash-core/lib/logstash/util.rb:1
set_thread_name at /home/cbwleft/Desktop/logstash-5.6.2/logstash-core/lib/logstash/util.rb:20
execute at /home/cbwleft/Desktop/logstash-5.6.2/logstash-core/lib/logstash/runner.rb:245
(root) at /home/cbwleft/Desktop/logstash-5.6.2/lib/bootstrap/environment.rb:71

`

[jordansissel]

Indeed, Java 9 is not yet supported by Logstash.

[cbwleft]

which make me confused is， I followed the installation steps，which says Java 8 or higher is required for Logstash 5.x. so I thought java 9 won't be the problem，nothing prompted me that I should use java 8 instead.

[jordansissel]

Java 9 was released barely a month ago. It's ok that our documentation is
not yet updated. There are only so many hours in the day :)

On Tue, Oct 10, 2017 at 5:55 PM cbwleft [e-mail] wrote:

Which confused me is，I followed the installation steps，which says Java 8
or higher is required for Logstash 5.x. so I thought java 9 won't be the
problem，nothing prompted me that I should use java 8 instead.

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[CamJN]

Java 9 was released Sept 22, it is now Dec 21. Are there any updates on getting this working?

[jordansissel]

Still not supported. There is work still needing to be done. I have no ETA.

[CamJN]

Java 9 will be EOL in Mar 2018, looks like it's literally never going to be supported? With Java moving to a rapid release schedule you're going to have to move faster on supporting new versions or dump the java dep for pure ruby.