static String setSystemProperty(final String key, final String value) {
return getSecurityManager() == null ? setProperty(key, value) : doPrivileged(new WritePropertyAction(key, value));
}
static ClassLoader getClassLoader(final Class<?> clazz) {
return getSecurityManager() == null ? clazz.getClassLoader() : doPrivileged(new GetClassLoaderAction(clazz));
}