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Steps to Reproduce:

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Only one rule:

rule "test.n3 0"
when
$LIST : java.util.List( )
from accumulate( $Triple_1 : Triple( $CN : subject, predicate == "<http://deductions.sf.net/samples/princing.n3p.n3#number>", $N : object )
, collectList( $N ) )
$NUMBER : Number() from accumulate(
$NUMBER_STRING_ : String() from $LIST
, sum( Double.parseDouble( $NUMBER_STRING_)) )
then
system.out ("test.n3 0 fires");
end

Needs to have 3 object asserted:

new Triple( ( "<CN1>", "<number>", "200" );
new Triple( ( "<CN2>", "<number>", "100" );
new Triple( ( "<CN3>", "<number>", "100" );

The Triple class :

http://eulergui.svn.sourceforge.net/viewvc/eulergui/trunk/eulergui/src/main/java/n3_project/helpers/Triple.java

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Only one rule: rule "test.n3 0" when $LIST : java.util.List( ) from accumulate( $Triple_1 : Triple( $CN : subject, predicate == "< http://deductions.sf.net/samples/princing.n3p.n3#number >", $N : object ) , collectList( $N ) ) $NUMBER : Number() from accumulate( $NUMBER_STRING_ : String() from $LIST , sum( Double.parseDouble( $NUMBER_STRING_)) ) then system.out ("test.n3 0 fires"); end Needs to have 3 object asserted: new Triple( ( "<CN1>", "<number>", "200" ); new Triple( ( "<CN2>", "<number>", "100" ); new Triple( ( "<CN3>", "<number>", "100" ); The Triple class : http://eulergui.svn.sourceforge.net/viewvc/eulergui/trunk/eulergui/src/main/java/n3_project/helpers/Triple.java
Git Pull Request:
https://github.com/droolsjbpm/drools/pull/118

There is an infinite loop .
It happens in the addPackage step.
It happens whatever is in the then part

infinite loop in rule with accumulate, even if the then part does nothing