[rules-users] List<String> wrongly coerced to Object

[aitchnyu]

I want to compare two List<String>'s if they have elements in common. I made
the following rule (actually two of them):

*----rule----*
rule "hardConflictIsIn"
    when
	$hc : HardConstraint(
			    $attribute  : attribute,
			    operator == "is in",
			    $values : strAttributeValue,
			    $period : period
			    )
	$stp : SubjectTeacherPeriod(
				    period == $period,
				    //Collections.disjoint( $t.attributes["tags"], values_list)
				    eval( Collections.disjoint( *strAttributeMap.get($attribute)*,
$values) == false )
				    )
    then
	insertLogical(new IntConstraintOccurrence("hardConflictIsIn", 
		ConstraintType.NEGATIVE_HARD,1,
                $hc,$stp));
end

*----rule----*

But I get the following error:

*----error----*
Exception in thread "main" java.lang.IllegalStateException: There are errors
in the scoreDrl's:
Rule Compilation error : [Rule name='hardConflictNotIn']

in/co/technovia/timetabler/domain/Rule_hardConflictNotIn_8b50378322e744d883618db9941a8e66.java
(9:1204) : The method disjoint(Collection<?>, Collection<?>) in the type
Collections is not applicable for the arguments (*Object*, List)

Rule Compilation error : [Rule name='hardConflictIsIn']

in/co/technovia/timetabler/domain/Rule_hardConflictIsIn_d7f4ca0884754cf894e7cbdb96cee30e.java
(9:1203) : The method disjoint(Collection<?>, Collection<?>) in the type
Collections is not applicable for the arguments (Object, List)


	at
org.drools.planner.config.solver.SolverConfig.buildRuleBase(SolverConfig.java:238)
	at
org.drools.planner.config.solver.SolverConfig.buildSolver(SolverConfig.java:170)
	at
org.drools.planner.config.XmlSolverConfigurer.buildSolver(XmlSolverConfigurer.java:103)
	at
in.co.technovia.timetabler.TimeTableApp.createSolver(TimeTableApp.java:61)
	at in.co.technovia.timetabler.TimeTableApp.main(TimeTableApp.java:45)
*----error----*

So something get'ted from the map SubjectTeacherPeriod.strAttributeMap is
wrongly coerced to an Object? I defined my SubjectTeacherPeriod class this
way:

*----class snippet----*

public class SubjectTeacherPeriod{
    ...
    private Map<String, Integer> num_attribute_map = new HashMap<String,
Integer>();
    private Map<String,List&lt;String>> str_attribute_map = new
HashMap<String,List&lt;String>>();
    ...
    public Map<String,List&lt;String>> getStrAttributeMap(){
	return this.str_attribute_map;
    }
    ...
    
*----class snippet----*

How can I fix this?

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