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Groovy is an object-oriented programming language for the Java platform. It is a dynamic language with features similar to those of Python, Ruby, Perl, and Smalltalk. It can be used as a scripting language for the Java Platform. It is easy to learn, has smooth Java integration, vibrant and rich ecosystem and powerful features. To know more about Groovy, see the official Groovy Documentation.

Learning Groovy

To learn more about the Groovy language:

• Start with our Groovy tutorial: Groovy tutorial

• Introduction to Groovy: See Learn Groovy in Y minutes and Learn Groovy in one Video

• Tutorials - many tutorials are available online, such as TutorialsPoint, Groovy with SmartThings and The Groovy 2 Tutorial

• References - See The Apache Groovy programming language and The Complete Apache Groovy Developer Course

Groovy in JMWE

Groovy in JMWE can be used either to write a Groovy expression or a Groovy template in the workflow extension configuration. 

Groovy expression results in JMWE are used in various Conditions, Validators, and Post-functions, including:

Conditions:

• Target issues section of Related Issues Condition and Related Issues Status Condition when Issues returned by a Groovy script or Issues returned by JQL search is selected under Which Issues field.

• Condition on related issues section of Related Issues Condition and Related Issues Status Condition

• Scripted (Groovy) Condition  to execute a condition

Validators:

• Target issues section of Related Issues Validator and Related Issues Status Validator when Issues returned by a Groovy script or Issues returned by JQL search is selected under Which Issues field.

• Condition on related issues section of Related Issues Validator and Related Issues Status Validator

• Scripted (Groovy) Validator  to execute a validator

• Conditional execution/validation using a Groovy expression in all the validators

Post-functions:

• Target issues section of all post-functions that operate on related issues when Issues returned by a Groovy script or Issues returned by JQL search is selected under Which Issues field.

• All post-functions with the Conditional execution/validation using a Groovy expression  section to execute a post-function conditionally

• Comment issue  and Comment related issues  post-functions to create the body of the comment by selecting Groovy expression as the Comment type

• Create/Clone issue(s)  post-function to

  • Calculate a project by selecting Calculated in Project

  • Calculate a parent issue key by selecting Calculated in Parent issue

  • Set fields of new issue by selecting Groovy expression as the Value type and 

  • Add a comment to the current issue by selecting Groovy expression as the Comment type

  • Multiple iterator section of the Create/Clone issue post-function

• Display message to user post-function to input

  • Message title

  • Message body

  • Action type

• Email Issue  post-function to

  • Write the Subject, HTML body, Text body

  • Attachments returned by a Groovy script

  • Set the Recipients from the script

  • Set email addresses from the script

  • Exclude users

• Link issues to the current issue in

  • JQL expression

  • Filter expression

• Scripted (Groovy) operation on issue  post-function to execute a Groovy script against an issue

• Set field value  and Set field value of linked issues  post-functions to set a field value by selecting Groovy expression as the Value type

• Transition current issue, Transition linked issues and Transition related issues post-functions in

  • Calculated transitions

  • Add field in transition screen with the result of a Groovy script

• Unlink issues from the current issue  post-function to unlink issues based on the result of a Groovy condition

• Groovy Console  of the JMWE Administration section to test/run Groovy scripts

• Shared Groovy Scripts under JMWE administration

• Transitions activity tab on issue view page , to show the Transitions activity tab on the issue view screen based on a Groovy condition

Writing Groovy scripts in JMWE

To learn how to write groovy scripts for JMWE, see:

• Groovy editor - This document explains you the Groovy editor in JMWE where you can write your Groovy script or Groovy template.

• Variables and functions used in a Groovy expression - This document explains you the variables available for your Groovy scripts and how to create new variables in your Groovy scripts.

• API Interfaces - The document details the API interfaces

• Accessing the fields of an issue - This document explains you on how to access the fields of an issue.

• Expected value for each field type when the value type is a Groovy expression - This document lists the expected values for each field type of your issue.

• Groovy templates - This document explains you on how to write Groovy templates in the Groovy editor

• Groovy script tester - This document explains the Groovy script tester which helps you test your written script or template and debug it.

Using Groovy Grapes

JMWE for Jira Server/Data Center now supports Groovy Grapes for dependency management and to import external libraries into Groovy scripts within JMWE. You can now add maven repository dependencies (and other repositories) to your classpath. See http://docs.groovy-lang.org/latest/html/documentation/grape.html for more information.

As an example, the following script grabs the OpenCSV library from Maven Repository:

@GrabResolver(name='opencsv', root='https://mvnrepository.com')
@Grab(group = 'com.opencsv', module = 'opencsv', version = '4.2')
class Example {
  Object getExternalLibrary() {
    return Class.forName('com.opencsv.bean.CsvToBeanBuilder').getDeclaredMethods()*.name
  }
}
new Example().getExternalLibrary()