Issue Reproducer: Drools Classloader does not work in Spring Fat Jar for Executable Model

To reproduce: mvn clean install java -jar target/DroolsExecutableReproducer-8.0.0-SNAPSHOT-exec.jar

Expected: Print 70

Actual: An exception related to not being able to find class files. In particular, it trying to find the class files in the main jar, when they are actually stored in BOOT-INF/drools-lib.jar.