presto-main/src/main/java/io/prestosql/server/PluginClassLoader.java/PluginClassLoader/getResources
class PluginClassLoader:    @Override
    public Enumeration<URL> getResources(String name)
            throws IOException
    {
        // If this is an SPI resource, use SPI resources
        if (isSpiClass(name)) {
            return spiClassLoader.getResources(name);
        }

        // Use local resources
        return super.getResources(name);
    }