topic Error in getValue from Expression in Alfresco Archive

Error in getValue from Expression

nandoztx — Thu, 09 Feb 2012 14:53:17 GMT

Hi everyone!I have a problem in getValue from Expression attrib in JavaDeletegate implemented class.When Expression attrib don't has value, so, attrib.getValue(execution) throw an exception like as: org.activiti.engine.ActivitiException: Unknown property used in expression.‍My example:in serviceri

Re: Error in getValue from Expression

nandoztx — Wed, 29 Feb 2012 15:38:05 GMT

I solve this with a workaround:
before endEvent, run a scriptTask to check if processVar is setted:


<scriptTask id="anything" scriptFormat="groovy">
<script>
try { personName; } catch (MissingPropertyException mpe) { personName = ""; }
</script>
</scriptTask>

I don't know if activiti will fix this in nexts releases, but, it works for now.

Re: Error in getValue from Expression

ronald_van_kuij — Wed, 29 Feb 2012 16:58:04 GMT

Activiti cannot fix it afaik. It is a EL issue. A none existing process variable is used, EL give you an exception. Try setting it to 'null' or '' instead of not having it at all. Catching the error in Activiti is impossible since there can be no differentiation between a not existing property and e.g. a typo (and thus a non-existing property)