log.debug("Failed to load handler class " + className, ex);
                        }
                        if (handlerClass == null) {
                            handlerClass = ClassLoader.getSystemClassLoader().loadClass(className);
                        }
                        handler = (URLStreamHandler) handlerClass.newInstance();
                        break;
                    } catch (final Exception ex) {

                        } catch (final Exception ex) {}
                        if (handlerClass == null) {
                            handlerClass = ClassLoader.getSystemClassLoader().loadClass(className);
                        }
                        handler = (URLStreamHandler) handlerClass.newInstance();
                        break;
                    } catch (final Exception ex) {}

    // Check the assumptions above.

    // FRQ tries to load the Finalizer class (for the reference-collecting thread) in a few ways.
    // If the class is accessible to the system ClassLoader (ClassLoader.getSystemClassLoader())
    // then FRQ does not bother to load Finalizer.class through a separate ClassLoader. That happens
    // in our test environment, which foils the purpose of this test, so we disable the logic for

                }
            }
        }
        return logs;
    }

    protected ClassWorld createClassWorld() {
        return new ClassWorld("plexus.core", ClassLoader.getSystemClassLoader());
    }

    protected abstract Invoker createInvoker(ClassWorld classWorld);

    protected abstract Parser createParser();

            return targetClassLoader;
        }
        if (thisClassLoader != null) {
            return thisClassLoader;
        }

        final ClassLoader systemClassLoader = ClassLoader.getSystemClassLoader();
        if (systemClassLoader != null) {
            return systemClassLoader;
        }

        throw new ClIllegalStateException(MessageFormatter.getMessage("ECL0001", "ClassLoader"));
    }

    /**

            return nameSet.stream().sorted().collect(Collectors.toList());
        }
        for (final File jarFile : jarFiles) {
            try (FileSystem fs = FileSystems.newFileSystem(jarFile.toPath(), ClassLoader.getSystemClassLoader())) {
                final Path xmlPath = fs.getPath("fess_ds++.xml");
                if (!Files.exists(xmlPath)) {
                    if (logger.isDebugEnabled()) {