Determine how to use external library inside a script task

Determine how an external script library can be used in a script task. Possible
scopes would be:

• global for process engine
• local to deployment
• local to process definition
• local to activity

Python:

• in a shared process engine scenario the default python path is apache-tomcat-$VERSION/lib/Lib resp. jboss-as-$VERSION/modules/org/python/jython/lib/Lib
• in a embedded process engine scenario the default python path is /src/main/resources of the project
• the environment variable JYTHONPATH can contain multiple paths separated by colons which are added to the python path in the scripting engine

Groovy:

• in a shared process engine scenario for Tomcat /apache-tomcat-VERSION/lib/.jar and /src/main/resources/.groovy but non in JBoss
• in a embedded process engine scenario /src/main/resources/*.groovy for Tomcat and JBoss

Ruby:

• in a shared process engine scenario has to be added to jruby-complete-VERSION.jar:
• jruby-complete-1.7.12.jar!/META-INF/jruby.home/lib/ruby/1.9/site_ruby
• jruby-complete-1.7.12.jar!/META-INF/jruby.home/lib/ruby/shared
• jruby-complete-1.7.12.jar!/META-INF/jruby.home/lib/ruby/1.9
• in an embedded process engine scenario /src/main/resources/ :
• classpath:/META-INF/jruby.home/lib/ruby/1.9/site_ruby
• classpath:/META-INF/jruby.home/lib/ruby/shared
• classpath:/META-INF/jruby.home/lib/ruby/1.9

Javascript:

• jdk < 1.8 (rhino js engine) only supports a load function in the shell but not in the embedded scripting engine (maybe possible to provide function which reads files from classpath)
• jdk 1.8 (nashorn engine) unable to identify classpath for load function but with http it works, e.g. load("http://localhost:9000/test.js");