tkobayas commented on issue #6529:
URL:
https://github.com/apache/incubator-kie-drools/issues/6529#issuecomment-3584356831
Workarounds until 10.2.0 will be released:
- Use non-RuleUnit / non-executable-model : The issue happens only with
executable-model (regardless of RuleUnit). So the workaround is to use
non-executable-model, which means to use the the traditional DRL without
RuleUnit and configures the dependency `drools-engine-classic`. The doc says
`drools-engine-classic` is deprecated, but it still works and can be a
workaround until 10.2.0 will be released.
- Avoid `exists XXX from` : The bug is related to `exists XXX from`. It
doesn't mean that `exists XXX from always` causes the issue, but if you replace
`exists XXX from` with a different expression, the issue would disappear.
For example)
```
import static com.model.Utils.hasChildOlderThan;
rule "Rule 2"
when
House() from entry-point houses
$person: Person() from entry-point people
//exists Child(age > 18) from $person.children
eval(hasChildOlderThan($person, 18))
not School() from entry-point schools
then
rulesFired.add("rule2");
end
```
```
public class Utils {
public static boolean hasChildOlderThan(Person person, int age) {
return person.getChildren().stream().anyMatch(a -> a.getAge() > age);
}
}
```
If you are migrating from old drools version, probably the first option
(non-executable-model) is easier. Traditional DRL is still fully supported, so
you are not forced to use RuleUnit.
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