JBPM and JEXL Integration

Following steps need to perform to configure the JEXL as a expression language for the JBPM.

1) Create a jbpm.default.scriptmanager.xml file.

     File contains following tag.

<?xml  version="1.0" encoding="UTF-8" ?>

<jbpm-configuration>





<process-engine-context>





<script-manager default-expression-language="jexl" default-script-language="jexl">



<script-language name="jexl" 

    factory="org.apache.commons.jexl2.scripting.JexlScriptEngineFactory" />





<script-language name="juel" factory="org.jbpm.pvm.internal.script.JuelScriptEngineFactory" />





<script-language name="bsh" factory="org.jbpm.pvm.internal.script.BshScriptEngineFactory" />





<script-language name="groovy"

   factory="org.jbpm.pvm.internal.script.GroovyScriptEngineFactory" />




</script-manager>





</process-engine-context>





</jbpm-configuration>

2) Import jbpm.default.scriptmanager.xml file into jbpm.default.cfg.xml file.

3) For the decision node specify the condition as follows.

  <decision name="evaluate document">
    <transition to="submit document">
      <condition expr="content=='good'" lang="jexl" />
    </transition>
    <transition to="try again">
      <condition expr="content=='not so good'" lang="jexl"/>
    </transition>
    <transition to="give up" />
  </decision>