[rules-users] accumulate vs collect

[rouvas at di.uoa.gr]

Hi List,

I'm trying to count the number of objects I have in the Working Memory
using accumulate, but I'm having a ClassCastException thrown at me.

Using a variant with collect, everything work OK.

Can someone shed some light on this issue?
Is it related to https://jira.jboss.org/browse/JBRULES-2202 ?

I'm using Drools.5.0.1 and the fact is a declared one, as follows:

declare t_1
  regRowId : String
  versionId : String
  c_7 : String
  c_1 : String
  c_2 : String
  c_3 : String
  c_4 : String
  c_5 : String
  c_6 : Double
end

trying with :

v945 : Number ( doubleValue  >=  1 ) from accumulate ( p : t_1 (  c_6 >=
20100511 && c_7 == "5" ) , count(p) )

I'm getting a ClassCastException:t_1, while using :

v945 : ArrayList ( size  >=  1 ) from collect ( t_1 (  c_6 >= 20100511 &&
c_7 == "5" )  )

works OK.

The reason I'm preferring accumulate over collect, is that I'm not really
interested in constructing an ArrayList of the matched facts (worries
about memory consumption), all I want is how many of them are there.

The actual rule I'm using (although I don't think it matters) for the
accumulate variant, is:

rule "r95944.6"
	dialect "mvel"
	when
		gnId : GoodNumbers()
		 LogicalValue : Trader( gnId.goodNo==goodNo  )
		 v945 : Number ( doubleValue  >=  1 ) from accumulate ( p : t_1 (  c_6
>= 20100511 && c_7 == "5" ) , count(p) )
	then
		RaResultCode rrc = new RaResultCode();
		  rrc.setResultRuleId("95944");
		  rrc.setResultRuleVersionId("6");
		  rrc.setResultColor("R");
		  rrc.setResultRuleCode("01");
		  rrc.setResultAction("1");
		  rrc.setResultGoodNo(gnId.goodNo);
		insertLogical(rrc);
end

Thank you for your time.

-Stathis