Darin Wilcox [http://community.jboss.org/people/zoikks] created the discussion "Re: Rules Accessing ArrayList as Process Parameters" To view the discussion, visit: http://community.jboss.org/message/641993#641993 -------------------------------------------------------------- Hi Yu, Thanks for the comment.  It is possible to write the objects into working memory and iterate over them.  The real intent of the question was why can't the ArrayList be accessed directly from the process as a parameter while other objects types can be? - Darin -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/641993#641993] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]

Maciej Swiderski [http://community.jboss.org/people/swiderski.maciej] created the discussion "Re: Rules Accessing ArrayList as Process Parameters" To view the discussion, visit: http://community.jboss.org/message/642306#642306 -------------------------------------------------------------- Darin, after spending some time on this issue I came up with following (that seems to be working fine): package org.zoikks.drools   import java.util.ArrayList; import java.util.List; import org.drools.runtime.process.WorkflowProcessInstance;   rule "Sample Rule" ruleflow-group "testgroup"     when         $process : WorkflowProcessInstance()         $a:  ArrayList()               from collect( String() from $process.getVariable("arrayList"))   then                     System.out.println("Sample Rule run successfully.");                     System.out.println("Count: " + $a.size()); end   Somehow $process.getVariable() returns strings instead of entire array list. HTH -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/642306#642306] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]

Maciej Swiderski [http://community.jboss.org/people/swiderski.maciej] created the discussion "Re: Rules Accessing ArrayList as Process Parameters" To view the discussion, visit: http://community.jboss.org/message/642543#642543 -------------------------------------------------------------- I do believe it works as designed. "from clause" is to reason over collection elements so it returns data type that is inside the collection. Alternatively you could try to just check if such process variable exists, for instance with "eval" and in consequence section access the array list (I think that works properly). Cheers -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/642543#642543] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]