working projects are attached This simple code works in Groovy project: {code} KieServices ks = KieServices.Factory.get(); KieRepository kr = ks.getRepository(); KieFileSystem kfs = ks.newKieFileSystem(); // String drl = new File("rules/r1.drl").getText() // kfs.write("src/main/resources/org/kie/example5/HAL5.drl", drl); KieBuilder kb = ks.newKieBuilder(kfs); kb.buildAll(); // kieModule is automatically deployed to KieRepository if successfully built. {code} but it fails with error if executed in Grails 2.2.4 application {code} 1. ERROR errors.GrailsExceptionResolver - ClassNotFoundException occurred when processing request: [GET] /grails-drools6/drools/index 2. org.drools.compiler.kie.builder.impl.KieModuleCache$KModuleCache. Stacktrace follows: 3. Message: org.drools.compiler.kie.builder.impl.KieModuleCache$KModuleCache 4. Line | Method 5. ->> 366 | run in java.net.URLClassLoader$1 6. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7. | 355 | run in '' 8. | 354 | findClass . . . . . . . . in java.net.URLClassLoader 9. | 424 | loadClass in java.lang.ClassLoader 10. | 357 | loadClass . . . . . . . . in '' 11. | 2521 | privateGetDeclaredMethods in java.lang.Class 12. | 1845 | getDeclaredMethods . . . in '' 13. | 46 | getLocked in org.codehaus.groovy.util.LazyReference 14. | 33 | get . . . . . . . . . . . in '' 15. | 64 | loadEngine in grails.drools6.DroolsService 16. | 8 | index . . . . . . . . . . in grails.drools6.DroolsController 17. | 195 | doFilter in grails.plugin.cache.web.filter.PageFragmentCachingFilter 18. | 63 | doFilter . . . . . . . . in grails.plugin.cache.web.filter.AbstractFilter 19. | 1145 | runWorker in java.util.concurrent.ThreadPoolExecutor 20. | 615 | run . . . . . . . . . . . in java.util.concurrent.ThreadPoolExecutor$Worker 21. ^ 724 | run in java.lang.Thread {code} do I need to configure custom (Grails) class loader to Kie ?