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Script Task which uses XSLT

Note: This example works also only with the XSLT scriptengine extension which is part of the camunda bpm enterprise edition. This example is based on a new functionality in camunda BPM 7.2 and, as such, is subject to change.

This quickstart demonstrates how to use the XSLT script engine extension to transform data in camunda BPM. The example is classless, relying entirely on scripting and expression language.

The example includes a BPMN 2.0 process which invokes a simple script task which transforms the input data into an transformed XML output:

XLST Example Process

Overview

How it works

The execution listener attached to the start event references a groovy script.

<bpmn2:startEvent id="StartEvent_1" name="give input">
  <bpmn2:extensionElements>
    <camunda:executionListener event="end">
      <camunda:script scriptFormat="groovy" resource="org/camunda/bpm/example/xsltexample/readXmlFile.groovy" />
    </camunda:executionListener>
  </bpmn2:extensionElements>
</bpmn2:startEvent>

This groovy script loads the example XML file and saves it in the process variable customers.

import org.camunda.commons.utils.IoUtil

xmlData = IoUtil.fileAsString('org/camunda/bpm/example/xsltexample/example.xml')
execution.setVariable('customers', xmlData)

println 'Input XML:'
println xmlData

The following script task uses the xsl stylesheet to transform the XML saved in the customers process variable and saves the result in the xmlOutput process variable.

<bpmn2:scriptTask id="ScriptTask_1" name="convert input" scriptFormat="xslt" camunda:resource="org/camunda/bpm/example/xsltexample/example.xsl" camunda:resultVariable="xmlOutput">
  <bpmn2:extensionElements>
    <camunda:inputOutput>
      <camunda:inputParameter name="camunda_source">${customers}</camunda:inputParameter>
    </camunda:inputOutput>
  </bpmn2:extensionElements>
</bpmn2:scriptTask>

Before the process ends the execution listener of the end event again executes a groovy script.

<bpmn2:endEvent id="EndEvent_1" name="show output">
  <bpmn2:extensionElements>
    <camunda:executionListener event="start">
      <camunda:script scriptFormat="groovy" resource="org/camunda/bpm/example/xsltexample/printResult.groovy" />
    </camunda:executionListener>
  </bpmn2:extensionElements>
</bpmn2:endEvent>

This groovy script just prints the process variable xmlOutput which contains the transformed XML.

println '\nTransformed XML:'
println execution.getVariable('xmlOutput')

How to use it?

  1. Checkout the project with Git
  2. Read and run the unit test