org.drools.compiler.kie.builder.impl.InternalKieModule.createKieModule(ReleaseId releaseId, File jar)

has a couple of issues
1) there is not a check on the actual type of File received as parameter: it expects it to be a "jar" - but this is not checked anywhere - so

ZipFile zipFile = new ZipFile(jar)

throws an exception whenever the given file is not a "jar"

2) every exceptions are catch and simply logged; but it seems that whatever exception may happen inside this if

if (zipEntry != null) {
                KieModuleModel kieModuleModel = KieModuleModelImpl.fromXML( zipFile.getInputStream( zipEntry ) );
                setDefaultsforEmptyKieModule( kieModuleModel );
                return kieModuleModel != null ? InternalKieModuleProvider.get( adapt( releaseId ), kieModuleModel, jar ) : null;
            }

it is actually a grave exception, since it means that it was impossible to retrieve an expected KieModule out of a given "kjar" (we know it is a kjar because zipEntry != null)