[rules-users] Memory leak when deploying to Maven repository?

Hello everybody, I use Drools to create rules from an external source and create an artifact from those rule strings, putting it into a local repository. A minimalistic working example can be found at https://github.com/dadadom/MavenMemoryLeakMinimalExample The code, taken from that example, is basically like this: ReleaseId releaseId = new ReleaseIdImpl("some:releaseid:1.0.0-SNAPSHOT"); String rules = "rule \"testrule\ ... "; KieServices kServices = KieServices.Factory.get(); KieFileSystem kfs = kServices.newKieFileSystem(); kfs.write("src/main/resources/someBase/testrule", rules); kfs.generateAndWritePomXML(releaseId); String kmoduleXmlString = "<kmodule ... </kmodule>"; kfs.writeKModuleXML(kmoduleXmlString.getBytes()); KieModule kieModule = kServices.newKieBuilder(kfs).getKieModule(); try { File pomFile = new File(System.getProperty("java.io.tmpdir"), "pom.xml"); try (FileOutputStream fos = new FileOutputStream(pomFile)) { fos.write(KieBuilderImpl.generatePomXml(releaseId).getBytes()); fos.flush(); } catch (IOException e) { e.printStackTrace(); } final MavenRepository mavenRepository = MavenRepository.getMavenRepository(); mavenRepository.deployArtifact(releaseId, (InternalKieModule) kieModule, pomFile); When I call this method in a ServletContextListener in a Tomcat Server (version 7 or 8) and undeploy the application afterwards, I get a memory leak. Tomcat tells me that the application has a memory leak: The following web applications were stopped (reloaded, undeployed), but their classes from previous runs are still loaded in memory, thus causing a memory leak (use a profiler to confirm): /mvntest Looking at the memory dump with e.g. JProfiler, I can trace the dangling instances back to an object static INSTANCE of class org.drools.compiler.kie.builder.impl.KieRepositoryImpl So it seems like there is something which I am either missing or which is a bug. I cannot find any .close() or .release() method or something alike on any of the involved objects ... If anyone could give me a hint how to solve this problem, I'd be happy not to litter my memory no more :) Regards and thanks Dominik ........................................................................... mit freundlichen Gr??en / kind regards Dominik Sandjaja Fon: +49 (0) 203 60878 183 Fax: +49 (0) 203 60878 222 e-mail: dominik.sandjaja(a)it-motive.de it-motive AG Zum Walkm?ller 6 47269 Duisburg info(a)it-motive.de http://www.it-motive.de .............................................................................. Vorsitzender des Aufsichtsrats: Dr.-Ing. J?rgen Sturm Vorstand: Horst-Dieter Deelmann (Vors.), Matthias Heming, Christoph Tim Klose HRB 9207, Amtsgericht Duisburg