java - "no viable alternative at input n" and "mismatched input" -

i have following class

public class droolsobjectrule {      private string backend;     private long time;     private long avgtime;     private boolean allow=true;     private string message;      //set      //get } 

my rule

rule "rule_3_increment_more"   salience 3   when     $drol: droolsobjectrule(backend == "ad1" &&  (2 * $drol.avgtime) > $drol.time) [this line 33]       $drol.setmessage("rule 3"); end 

when run code following error

caused by: java.lang.illegalargumentexception:   [33,48]: [err 101] line 33:48 no viable alternative @ input '2'           in rule "rule_3_increment_more" in pattern droolsobjectrule  [33,79]: [err 102] line 33:79 mismatched input ')' expecting '('           in rule "rule_3_increment_more" in pattern droolsobjectrule in pattern $drol.time 

any idea?

the rule works correctly in 5.3.0, 5.6.0, 5.5.0, 6.0.0 , 6.1.0.

if use older version, stick legacy form of constraints:

droolsobjectrule( backend == "ad1", $avgtime: avgtime,                   time < 2*$avgtime )