Class loading issue in Eclipse Equinox OSGi container ----------------------------------------------------- Key: DROOLS-5345 URL: https://issues.redhat.com/browse/DROOLS-5345 Project: Drools Issue Type: Bug Components: core engine Affects Versions: 7.37.0.Final Reporter: Richard Schurig Assignee: Mario Fusco Priority: Major When using Drools inside an *Equinox* OSGi container (Oxygen, org.eclipse.osgi-3.12.0.v20170512-1932.jar) the logic inside {{org.drools.relective.classloader.ProjectClassLoader#isOsgiClassLoader}} does not work properly, i.e. the OSGi runtime is not detected. This leads to "The Eclipse JDT Core jar is not in the classpath" because the shaded and packed compiler classes cannot be found. Cause of the problem seems to be the fact that the {{EquinoxClassLoader}} does not implement {{BundleReference}} directly *but so does its superclass*. I tried and patched {{ProjectClassLoader}} with the following snippet and this seems to work: {code:java} private static boolean isOsgiClassLoader(final ClassLoader cl) { Class<?> clc = cl.getClass(); while (clc != null && !clc.equals(ClassLoader.class)) { if (Stream.of(clc.getInterfaces()).map(Class::getSimpleName).anyMatch(name -> name.equals("BundleReference"))) { return true; } clc = clc.getSuperclass(); } return false; } {code}