topic Re: jRuby scripting setting up guidelines wanted in Alfresco Archive

jRuby scripting setting up guidelines wanted

zloy — Wed, 08 Jul 2015 11:44:50 GMT

Hi,I'm new to developing for Activiti bpm. These days I mainly used its REST API, and now I need to make some scripts in jRuby. I looked through Activiti user guide and didn't find any directions how to make avitiviti server to execute scripts in ruby, except that I should put jruby.jar to CLASSPAT

Re: jRuby scripting setting up guidelines wanted

trademak — Thu, 09 Jul 2015 06:59:36 GMT

We have seen a lot of Javascript and Groovy scripts, but jRuby I've not used that much. What kind of direction are you looking for? You should be able to write a jRuby script like you are used to. Process variables will be available as jRuby variables and there's an execution variable that's a DelegateExecution instance which you can use for more complex logic.

Best regards,

Re: jRuby scripting setting up guidelines wanted

zloy — Thu, 09 Jul 2015 14:20:18 GMT

I mainly write in ruby, while java and jruby fields are new to me. This time I need to write a scripting task which propagates process variables to remote REST service. Basically I need to write a script which reads configuration yaml file to instantiate a connection to remote REST service using Faraday gem, and make a POST request.

Yesterday I spent all day to make my hello world script run in script task in test process. It took so long cause I couldn't find any directions how to make activiti run jruby script. Seems it's obvious to java guys, but to me as rubyist it was very unclear. I managed it, picking bits of relevant info over the Internet. Today I spent to figure out how to install and make Faraday gem available to my test script, where to place gems, shall I set special permissions to gem files, etc, and finally I could `require 'faraday'`. And I'm not sure I did it right way. I still can not use bundler, despite it's installed just like faraday:

export GEM_HOME=/var/lib/tomcat6/shared/gems
export GEM_PATH=/var/lib/tomcat6/shared/gems
java -jar jruby-complete-1.7.21.jar -S gem install bundler

My task fails when I put `require 'rubygems'; require 'bundler/setup' in it. But I think I can get along without it.

I found no tutorial how to make activiti use jruby, how to install gems, how to use Gemfile, nor how to write simple scripts which access process variables. Sad, but true, I stuck in every trivial bit of work.

That is why I'd appreciate for any jruby scripting examples.

Re: jRuby scripting setting up guidelines wanted

jbarrez — Tue, 14 Jul 2015 19:06:48 GMT

There are some other people trying out JRuby scripting, but it's not very successful: http://forums.activiti.org/content/scripttask-jruby-cannot-access-execution-variable

I'm also not sure if the 'traditional' way of using gems will work. JRuby as a scripting engine is limited and does not read gems like the regular ruby does.

Like Tijs said, we don't see many rubyist passing here, so I can't really help you out with examplex I'm afraid.

Doing a post request with Java is another option of course, which many people here could help you with, but then you'd need to get some Java knowledge of course :s