sharad-zee opened a new issue, #2293:
URL: https://github.com/apache/incubator-kie-issues/issues/2293
## 🐛 Bug: Drools 10.2.0 fails to compile minimal rule on Java 25
### Description
Drools **10.2.0** fails to compile even minimal rules when running on **Java
25**.
The compiler throws an `UnsupportedOperationException` in
`DummyConstraintBuilder.setExprInputs`.
Downgrading to **Drools 10.1.0** resolves the issue, indicating a regression
in 10.2.0.
---
### Expected Behavior
A minimal DRL rule should compile successfully using `KieBuilder.buildAll()`.
---
### Actual Behavior
Compilation fails with an `UnsupportedOperationException`.
---
### Environment
- **Drools Version:** 10.2.0 (Regression from 10.1.0)
- **Java Version:** 25
- **OS:** macOS (Darwin)
---
### Steps to Reproduce
1. Create a minimal DRL file:
```drl
package rules
rule "Minimal Rule"
when
String()
then
end
```
Compile using the following Java code:
```java
KieServices kieServices = KieServices.Factory.get();
KieFileSystem kieFileSystem = kieServices.newKieFileSystem();
kieFileSystem.write("src/main/resources/rules/test.drl", drlContent);
KieBuilder kieBuilder = kieServices.newKieBuilder(kieFileSystem);
kieBuilder.buildAll(); // Crashes here
```
Stack Trace
```
java.lang.UnsupportedOperationException
at
org.drools.compiler.rule.builder.ConstraintBuilder$DummyConstraintBuilder.setExprInputs(ConstraintBuilder.java:210)
at
org.drools.compiler.rule.builder.PatternBuilder.getExprBindings(PatternBuilder.java:1123)
at
org.drools.compiler.rule.builder.PatternBuilder.buildRelationalExpression(PatternBuilder.java:1108)
at
org.drools.compiler.rule.builder.PatternBuilder.buildExpression(PatternBuilder.java:986)
...
```
### Additional Context
Issue does not occur on Drools 10.1.0
Appears to be a regression introduced in 10.2.0
Reproducible with a minimal rule (no constraints)
Possible Root Cause (Speculative)
The failure occurs in DummyConstraintBuilder.setExprInputs, which may
indicate an incompatibility with Java 25 or a regression in constraint handling
logic.
### Workaround
Downgrade to Drools 10.1.0, where the issue does not occur.
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