127.0.0.1:9999: invalid IPv6 address

[fendo8888]

    public static void main(String[] args) throws Exception {
        HttpProxyServerConfig config = new HttpProxyServerConfig();
        config.setHandleSsl(true);
        config.setMaxHeaderSize(8192 * 2);
        new HttpProxyServer()
                .serverConfig(config)
                .start(9999);
    }

访问127.0.0.1:9999 报错：

java.net.UnknownHostException: 127.0.0.1:9999: invalid IPv6 address
	at java.net.InetAddress.getAllByName(InetAddress.java:1170)
	at java.net.InetAddress.getAllByName(InetAddress.java:1127)
	at java.net.InetAddress.getByName(InetAddress.java:1077)
	at io.netty.util.internal.SocketUtils$8.run(SocketUtils.java:156)
	at io.netty.util.internal.SocketUtils$8.run(SocketUtils.java:153)
	at java.security.AccessController.doPrivileged(Native Method)
	at io.netty.util.internal.SocketUtils.addressByName(SocketUtils.java:153)
	at io.netty.resolver.DefaultNameResolver.doResolve(DefaultNameResolver.java:41)
	at io.netty.resolver.SimpleNameResolver.resolve(SimpleNameResolver.java:61)
	at io.netty.resolver.SimpleNameResolver.resolve(SimpleNameResolver.java:53)
	at io.netty.resolver.InetSocketAddressResolver.doResolve(InetSocketAddressResolver.java:55)
	at io.netty.resolver.InetSocketAddressResolver.doResolve(InetSocketAddressResolver.java:31)
	at io.netty.resolver.AbstractAddressResolver.resolve(AbstractAddressResolver.java:106)
	at io.netty.bootstrap.Bootstrap.doResolveAndConnect0(Bootstrap.java:206)
	at io.netty.bootstrap.Bootstrap.access$000(Bootstrap.java:46)
	at io.netty.bootstrap.Bootstrap$1.operationComplete(Bootstrap.java:180)
	at io.netty.bootstrap.Bootstrap$1.operationComplete(Bootstrap.java:166)