drccrd opened a new issue, #6784:
URL: https://github.com/apache/incubator-kie-drools/issues/6784
**Summary:** When a pattern has no identifier, the exec model auto-generates
one; to do so, `ClassPatternDSL.findFirstInnerBinding` parses **every**
constraint with `DrlxParseUtil.parseExpression` — a stricter parser than the
`ConstraintParser.drlxParse` used for actual constraint compilation. If that
strict parse throws, the `ParseProblemException` propagates and aborts the
whole KieBase build from the naming pre-pass, masking the real compilation and
yielding a confusing error.
**Reproducer** (`Child extends Person`; constraint uses the subtype-match
idiom `class == X.class`):
```drl
import org.test.Person;
import org.test.Child;
rule R when
Person( class == Child.class )
then end
```
- **Actual:** `ParseProblemException: Encountered unexpected token … at line
1, column 1`, thrown from `findFirstInnerBinding` → aborts the build.
**Root cause:** `findFirstInnerBinding` does not guard the `parseExpression`
call. A constraint the strict parser can't parse cannot contribute an inner
binding for naming anyway, so it should not abort the build.
**Suggested fix:** catch the parse failure, log it (rule + pattern type +
offending expression), and skip it — letting the real compilation path
(`findAllConstraint` → `drlxParse`) either compile the constraint or report a
proper error.
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