We are deploying our Spring Boot Rules Engine service inside of a container in a JAR file.

When we execute

 RuleUnitProvider.get().createRuleUnitInstance(appointmentAccessUnit); 

we get the following error:

java.lang.RuntimeException: Cannot find any rule unit for RuleUnitData of class:....AppointmentAccessUnit

After debugging the code I found that the error occurs in RuleUnitProviderImpl::ruleResourcesForUnitClass (line 113 in 8.33.0.Final)

The line

Optional.ofNullable(new File(path).listFiles())

looks for the DRL files in `file:/opt/dir/service/lib/rules-engine-1.0.0.jar!/com/site/dir/dir/v1/service/rules` which always comes up empty since the `listFiles` method doesn't really work with JAR files.