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Extensions with JRuby doesn't work anymore

Tiago | Last updated: Apr 12, 2016 08:08PM UTC

I am developing burp extensions using JRuby. My code needs to use some ruby libs (require 'uri', require 'json', etc), but when I try to load my plugin in Burp's extension tab, the following error was thrown: LoadError: no such file to load -- require require at org/jruby/RubyKernel.java:937 <top> at <script>:12 org.jruby.embed.EvalFailedException: (LoadError) no such file to load -- require at org.jruby.embed.internal.EmbedEvalUnitImpl.run(EmbedEvalUnitImpl.java:131) at org.jruby.embed.jsr223.JRubyEngine.eval(JRubyEngine.java:118) at burp.ut.<init>(Unknown Source) at burp.pxf.a(Unknown Source) at burp.wke.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) Caused by: org.jruby.exceptions.RaiseException: (LoadError) no such file to load -- require at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:937) at RUBY.<top>(<script>:12) Even when I tried to run another ruby extension from Burp App Store (Faraday for example), supposed to be working fine, I have received the same kind of error was shown as exhibited below: LoadError: no such file to load -- xmlrpc/client require at org/jruby/RubyKernel.java:937 <top> at <script>:16 org.jruby.embed.EvalFailedException: (LoadError) no such file to load -- xmlrpc/client at org.jruby.embed.internal.EmbedEvalUnitImpl.run(EmbedEvalUnitImpl.java:131) at org.jruby.embed.jsr223.JRubyEngine.eval(JRubyEngine.java:118) at burp.ut.<init>(Unknown Source) at burp.pxf.a(Unknown Source) at burp.wke.run(Unknown Source) at java.lang.Thread.run(Thread.java:745) Caused by: org.jruby.exceptions.RaiseException: (LoadError) no such file to load -- xmlrpc/client at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:937) at RUBY.<top>(<script>:16) I have installed all gems and my JRuby was installed using rvm.

PortSwigger Agent | Last updated: Apr 13, 2016 09:28AM UTC

We're not seeing any problems installing Faraday. Note that Faraday requires version 1.7 or later of JRuby, which might explain the problem.

Burp User | Last updated: Apr 13, 2016 11:45PM UTC

Hi Dafydd, I really appreciate your answer to my question, but I am not sure what's happening, I have all version requirements (jruby, etc), I tried to run burp/jruby using kali linux as well, but it doesn't work. The problem is that jruby or burp weren't finding the path to load ruby libs, this way when I use for example: require 'uri', the exception previously described was thrown. These issues are blocking me to finish my burp extension.

PortSwigger Agent | Last updated: Apr 14, 2016 08:01AM UTC

We testing using jruby-complete-1.7.10.jar. With this configured at Extender / Options / JRuby Environment, the Faraday extension loads without any problems.

Burp User | Last updated: Mar 19, 2017 02:33AM UTC

I can confirm I was seeing the same error message with regard to the Faraday extension being unable to load the 'xmlrpc/client' library that Tiago posted above. I tried with both JRuby 9.1.8.0 and JRuby 1.7.26, both reporting the same error. I could "require xmlrpc/client" manually via the 'jirb' repl, so I was at a loss as far as why Burp couldn't find it. Following Dafydd's advice, I grabbed "JRuby 1.7.26 Complete.jar," from jruby.org/download, and the Faraday extension loaded without any problems. Thanks for your help, Dafydd. Thanks also, Tiago, for posting this question.

Burp User | Last updated: Aug 03, 2018 09:58AM UTC