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I download it at https://www.elastic.co/downloads/logstash. And test it in CentOS 7.0. The JRE's version is 1.8.0_101. When I run ./bin/logstash agent -f config/log4j_to_es.conf it prints:

Unable to find JRuby.
If you are a user, this is a bug.
If you are a developer, please run 'rake bootstrap'. Running 'rake' requires the 'ruby' program be available.

I download the TAR.GZ package. I don't know how to fix it.

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I have found something really interesting relating to this error, where we see the following error: Unable to find JRuby.

In short, it turned out for me that the TAR.GZ file was incompletely unpacked.

I had a .tar.gz file and used tar -xzf command to extract its contents into a filesystem directory. What was missing was the following directory: logstash-5.5.2/vendor/jruby

I then found out that my server's filesystem was out of space, hence only partial TAR.GZ extraction happened. When I cleared up the filesystem, and unpacked the logstash archive, everything works! Happy days!

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In a tarballed installation, jruby exists under the vendor folder. Make sure it exists. The logstash command you're running is basically a shell script, which sources a lib file bin/logstash.lib.sh

Also, try running in debug mode:

export DEBUG=1
./bin/logstash --help

The likely culprit is:

  • you've set JAVA_HOME, which means you're using the OS java.
  • you've accidentally set the USE_RUBY environment variable
  • I run export JAVACMD=which java`` and I print the JAVA_HOME /usr/java/jdk1.8.0_101/bin. So it seems right. Then I print the USE_RUBY and get nothing. – blackdog Sep 26 '16 at 3:33
  • Having checked the shell, I can't find jruby in vender. How can I fix it? – blackdog Sep 26 '16 at 3:40

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