Drools Runtime does not recognize Custom Operator Parameter ----------------------------------------------------------- Key: DROOLS-2486 URL: https://issues.jboss.org/browse/DROOLS-2486 Project: Drools Issue Type: Feature Request Components: core engine Affects Versions: 7.7.0.Final Reporter: bharath mogali Assignee: Mario Fusco Problem Statement: We have few custom operators for Date and Strings, which are implemented looking at Str operator like shown here: https://github.com/kiegroup/drools/blob/f7ab4ee3c88d767a8cbb372c2db1afa84... with below configuration in kie.properties.conf: drools.evaluator.str = com.company.drools.operators.StrEvaluatorDefinition For Custom Str operator we created, Drools runtime is not able to make distinction between Str[begins] and Str[ends]. What this means is when we are running below tests, we expect Rule-1 to fail and Rule-2 to get activated. But what we noticed is, Rule-2 will not be activated. // Facts input into drools : // str1 = drools // str2 = dr rule "Rule-1" when message : Customer( str1 str[endsWith] str2 ) then System.out.println("Rule - Str 1 - fired"); end rule "Rule-2" when message : Customer( str1 str[startsWith] str2 ) then System.out.println("Rule - Str 2 - fired"); end Other Observations: If we change RHS to a a string literal like shown below, then Rule-2 will be Activated. // Facts input into drools : // str1 = drools // str2 = dr rule "Rule-1" when message : Customer( str1 str[endsWith] "abc" ) then System.out.println("Rule - Str 1 - fired"); end rule "Rule-2" when message : Customer( str1 str[startsWith] str2 ) then System.out.println("Rule - Str 2 - fired"); end Finally We removed Str custom operator, and then used the out of the box Str operator provided by drools. We ran below mentioned tests again, this time Rule-2 gets activated. // Facts input into drools : // str1 = drools // str2 = dr rule "Rule-1" when message : Customer( str1 str[endsWith] str2 ) then System.out.println("Rule - Str 1 - fired"); end rule "Rule-2" when message : Customer( str1 str[startsWith] str2 ) then System.out.println("Rule - Str 2 - fired"); end Based on our tests, it seems like custom operators are not processed correctly.