nagarajgond opened a new issue, #6539:
URL: https://github.com/apache/incubator-kie-drools/issues/6539
### Description
Below rule throws exception since it has leading zero with DRL10 parser.
**Same rule works fine with DRL6 parser**.
```
package com.test.drl;
unit PolicyUnit;
rule "rule2"
salience -110
when
result: /results[ this != null ]
( /facts [ name == "hour_of_the_day", value < 02 ])
then
result.addFiredRule("rule2");
end
```
```
Exception in thread "main" org.kie.api.builder.CompilationErrorsException:
Unable to create KieModule, Errors Existed: [Message [id=1,
kieBase=defaultKieBase, level=ERROR, path=test/drl/rules/rule2.drl, line=8,
column=0
text=no viable alternative at input '( /facts [ name ==
"hour_of_the_day", value < 02'], Message [id=2, kieBase=defaultKieBase,
level=ERROR, path=test/drl/rules/rule2.drl, line=8, column=0
text=mismatched input '[' expecting {'unit', 'function', 'global',
'declare', 'trait', 'type', 'rule', 'query', 'when', 'then', 'end', 'and',
'or', 'exists', 'not', 'in', 'from', 'collect', 'accumulate', 'acc', 'init',
'action', 'reverse', 'result', 'entry-point', 'eval', 'forall', 'over',
'groupby', 'matches', 'memberOf', 'contains', 'excludes', 'soundslike', 'str',
'after', 'before', 'coincides', 'during', 'includes', 'finishes', 'finishedby',
'meets', 'metby', 'overlaps', 'overlappedby', 'starts', 'startedby', 'window',
'attributes', 'salience', 'enabled', 'no-loop', 'auto-focus', 'lock-on-active',
'refract', 'direct', 'activation-group', 'ruleflow-group', 'date-effective',
'date-expires', 'dialect', 'calendars', 'timer', 'duration', '?/', 'abstract',
'assert', 'boolean', 'break', 'byte', 'case', 'catch', 'char', 'class',
'const', 'continue', 'default', 'do', 'double', 'else', 'enum', 'extends',
'final', 'finally', 'float', 'for', 'if', 'goto', 'implements', 'import', 'insta
nceof', 'int', 'interface', 'long', 'native', 'package', 'private',
'protected', 'public', 'return', 'short', 'static', 'strictfp', 'super',
'switch', 'synchronized', 'this', 'throw', 'throws', 'transient', 'try',
'void', 'volatile', 'while', 'module', 'open', 'requires', 'exports', 'opens',
'to', 'uses', 'provides', 'with', 'transitive', 'var', 'yield', 'record',
'sealed', 'permits', 'non-sealed', '(', ';', '?', '/', IDENTIFIER}], Message
[id=3, kieBase=defaultKieBase, level=ERROR, path=test/drl/rules/rule2.drl,
line=0, column=0
text=Parser returned a null Package]]
at
org.drools.compiler.kie.builder.impl.KieBuilderImpl.getKieModule(KieBuilderImpl.java:559)
at
org.drools.compiler.kie.builder.impl.KieBuilderImpl.getKieModule(KieBuilderImpl.java:545)
```
### Tech stack
Java 21
Drools 10.1.0
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