public static void releaseAll() {
        // since SLF4J based JCL does not make use of classloaders, there is nothing
        // to do here
    }
Release any internal references to previously created {@link LogFactory}
instances, after calling the instance method <code>release()</code> on
each of them. This is useful in environments like servlet containers, which
implement application reloading by throwing away a ClassLoader. Dangling
references to objects in that class loader would prevent garbage
collection.
jcl-over-slf4j/src/main/java/org/apache/commons/logging/LogFactory.java