StringIndexOutOfBoundsException in readFromJar ---------------------------------------------- Key: DROOLS-849 URL: https://issues.jboss.org/browse/DROOLS-849 Project: Drools Issue Type: Bug Components: core engine Affects Versions: 6.2.0.Final Environment: Ubuntu, Netbeans, openjdk-7, maven Reporter: Benjamin Carlyle Assignee: Mario Fusco Fix For: 6.3.0.CR1 I am trying to get a small app of the ground which loads a number of KieModules from jar files. I found that in cases where the jar contains a file in the jar's root directory a SIOOBE is raised as follows: I have run into what may be the same issue trying to get a small application up with a separate jar for my module. The NPE I found was thrown as follows: Exception in thread "main" java.lang.StringIndexOutOfBoundsException: String index out of range: -1 at java.lang.String.substring(String.java:1911) at org.drools.compiler.compiler.io.memory.MemoryFileSystem.readFromJar(MemoryFileSystem.java:457) at org.drools.compiler.kie.builder.impl.KieServicesImpl.newKieBuilder(KieServicesImpl.java:105) at com.siemens.systematics.configurator.ConfiguratorMain.loadModule(ConfiguratorMain.java:59) at com.siemens.systematics.configurator.ConfiguratorMain.loadModules(ConfiguratorMain.java:54) at com.siemens.systematics.configurator.ConfiguratorMain.main(ConfiguratorMain.java:32) This is caused by entry.getName().lastIndexOf('/') returning -1 for (in my case) a name of "rules.drl". The module itself was created using the 6.2.0Final maven archetype so it seems like this should be a common occurrence. I did find one users' report of this issue on a forum from 2013. A workaround appears to be just to ensure that the rules.drl file is not in the root directory.