JESS: Inserting a fact created using assert into a multislot in in java

[portalguy]

I'm calling a java function to insert a fact (created in jess script using
assert) into a multislot, however I get the following message "Not a vector
type: "nil" JessHelper: insertFactToMultislot"
In the example below I'm basically adding an ancestor of type Human template
to a multislot field.

Thanks in advance for the help.


JessScript
-----------
(deftemplate Human
(slot Name (type STRING))
(multislot Ancestors))

(assert (Human (Name "a")
(Ancestors (assert (Human (Name "b")))(assert (Human (Name "c"))))
))

(defrule addToMS
"add to multislot"
?fact <- (Human (Name "a"))
=>
(call ?jessHelper insertFactToMultislot ?fact Ancestors (assert (Human (Name
"d"))))
)

java function
--------------
 public void insertFactToMultislot(Fact fact,String multislotName,Fact
factValue)
  {
    try
    {
      Value value=fact.getSlotValue(multislotName);
      ValueVector vecValue =value.listValue(engine.getGlobalContext());
      vecValue.add(new Value(factValue,RU.FACT));
    }
    catch (JessException e)
    {
      System.out.println(e.getMessage() + " JessHelper:
insertFactToMultislot");
    }
  }




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