question: public GetFormKeyCmd ( String processDefinitionId , String taskDefinitionKey ) { setProcessDefinitionId ( processDefinitionId ) ; if ( taskDefinitionKey == null || taskDefinitionKey . length ( ) < 1 ) { throw new ActivitiIllegalArgumentException ( "The task definition key is mandatory, but '" + taskDefinitionKey + "' has been provided." ) ; } this . taskDefinitionKey = taskDefinitionKey ; }
target:  Retrieves a task form key.