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Version: 3.4.x

Supported scripts

Supported scripts

Scripts are used to define and run actions but also properties inside nodes. For now, the following script languages are supported:

Scripting LanguageVersion
Python (Jython)2.7.0
Nashorn engine (JavaScript)15.4



We use Jython.

Jython is an implementation of the high-level, dynamic, object-oriented language Python seamlessly integrated with the Java platform. Jython is an open-source solution.


  • Supports Python 2.7 most common python libs can be imported, ex: math, time, etc.
  • Java libs can also be imported: details here
»Python 2.7.18 documentation»Jython»Jython FAQs


Decision Model and Notation (DMN) is a standard for Business Decision Management.

FLOWX uses (based on camunda-engine-dmn version 7.14.0) which is built on DMN 1.3 standards.


camunda-engine-dmn supports DMN 1.3, including Decision Tables, Decision Literal Expressions, Decision Requirements Graphs, and the Friendly Enough Expression Language (FEEL)

»Decision Model and Notation (DMN)»DMN 1.3 specs

More information:

»Intro to DMN»DMN Business Rule Action


MVEL is a powerful expression language for Java-based applications. It provides a plethora of features and is suited for everything from the smallest property binding and extraction, to full-blown scripts.

»Mvel documentation»Maven repository: Mvel 2.4.0 final

More information:

»Intro to MVEL


Groovy is a multi-faceted language for the Java platform. The language can be used to combine Java modules, extend existing Java applications and write new applications

We use and recommend Groovy 3.0.8 version, using groovy-jsr223 engine.


Groovy has multiple ways of integrating with Java, some of which provide richer options than available with JSR-223 (e.g. greater configurability and more security control). JSR-223 is recommended when you need to keep the choice of language used flexible and you don't require integration mechanisms not supported by JSR-223.


JSR-223 (spec) is a standard scripting API for Java Virtual Machine (JVM) languages . The JVM languages provide varying levels of support for the JSR-223 API and interoperability with the Java runtime.

»Groovy Language Documentation»[Java] Class GroovyScriptEngineImpl

Nashorn Engine (JavaScript)

Nashorn engine is an open source implementation of the ECMAScript Edition 5.1 Language Specification. It also implements many new features introduced in ECMAScript 6 including template strings; let, const, and block scope; iterators and for..of loops; Map, Set, WeakMap, and WeakSet data types; symbols; and binary and octal literals. It is written in Java and runs on the Java Virtual Machine.

Latest version of Nashorn is 15.4, available from Maven Central. You can check the changelog to see what's new.

»GitHub - Nashorn»OpenJDK - Nashorn

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