I was facing the same issue and found that my rules file was not making it into my JAR file. Because I am using Maven, I was able to include: <resources> <resource> <directory>src/main/resources/rules</directory> </resource> </resources> in my pom.xml file. This allowed my rules files to be included inside of my jar and everything worked fine afterwards. -- View this message in context: http://drools.46999.n3.nabble.com/Unable-to-get-LastModified-for-Classpat... Sent from the Drools: User forum mailing list archive at Nabble.com.