private boolean hasPluginJar(URL[] urls) {
        for (URL url : urls) {
            // if (url.equals(pluginJarURL)) { fix very slow
            // http://michaelscharf.blogspot.com/2006/11/javaneturlequals-and-hashcode-make.html
            final String externalForm = url.toExternalForm();
            if (pluginConfig.getPluginJarURLExternalForm().equals(externalForm)) {
                return true;
            }
        }
        return false;
    }
@author Woonduk Kang(emeroad)
@author jaehong.kim
agent-module/profiler/src/main/java/com/navercorp/pinpoint/profiler/instrument/classloading/URLClassLoaderHandler.java