[jboss-jira] [JBoss JIRA] (DROOLS-5345) Class loading issue in Eclipse Equinox OSGi container

[Richard Schurig (Jira)]

Richard Schurig created DROOLS-5345:
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             Summary: 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


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}




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