Netty SSL服务器和客户端

似乎服务器拒绝wireshark输出中的tls协商，但我无法从代码中看出原因。它基于有效的代码，只是它被弃用了，因此我用新的API进行了更新。代码是要开始的。需要使用真实的证书。有人知道服务器为什么发送tcp FIN，ACK吗

我有以下服务器代码：

    ServerBootstrap sbssl = new ServerBootstrap();
    bossGroupSsl = new NioEventLoopGroup(1);
    workerGroupSsl = new NioEventLoopGroup();
    sbssl.group(bossGroupSsl, workerGroupSsl).option(ChannelOption.SO_RCVBUF, 8192).handler(new LoggingHandler(LogLevel.DEBUG))
            .option(ChannelOption.RCVBUF_ALLOCATOR, new FixedRecvByteBufAllocator(8192))
            .channel(NioServerSocketChannel.class)
            .childHandler(new ChannelInitializer<SocketChannel>() {

                @Override
                protected void initChannel(SocketChannel ch) throws Exception {
                    ChannelPipeline cp = ch.pipeline();
                    SelfSignedCertificate cert = new SelfSignedCertificate();
                    SslContext cont2 = SslContextBuilder.forServer(cert.privateKey(), cert.certificate()).build();
                    SSLEngine engine = cont2.newEngine(ch.alloc());
                    cp.addLast("ssl", new SslHandler(engine));

但这并不是（tcp fin，ack）：

---

Netty 4.1.20.Final解决了服务器没有响应的问题。不过，ChannelComplete在服务器端调用了几次，而在客户端有一个空指针。所有这些都不会影响客户机-服务器进程的功能。

似乎存在NullPointerException。请注意，当服务器端配置了不推荐使用的方法SslContext.newServerContext时，就会出现空指针。还要注意，服务器端的Android/客户端和JSSE使用openssl。

        Bootstrap b = new Bootstrap();
        group = new NioEventLoopGroup();
        Log.d(RegisterAttemptSSL.class.getName(), "connecting");
        InetSocketAddress ria = new InetSocketAddress(toHostname, portDestination);
        b.group(group).channel(NioSocketChannel.class).option(ChannelOption.IP_TOS, 24)
                .remoteAddress(ria).handler(new ChannelInitializer<SocketChannel>() {
            @Override
            protected void initChannel(SocketChannel ch) throws Exception {
                SslContext cont2 = SslContextBuilder.forClient().trustManager(InsecureTrustManagerFactory.INSTANCE).build();
                SSLEngine engine = cont2.newEngine(ch.alloc(), toHostname, portDestination);
                engine.setEnabledProtocols(new String[] {"TLSv1.2"});
                ch.pipeline().addLast(new SslHandler(engine, false));

    ServerBootstrap sbssl = new ServerBootstrap();
    bossGroupSsl = new NioEventLoopGroup(1);
    workerGroupSsl = new NioEventLoopGroup();
    sbssl.group(bossGroupSsl, workerGroupSsl).option(ChannelOption.SO_RCVBUF, 8192)
            .option(ChannelOption.RCVBUF_ALLOCATOR, new FixedRecvByteBufAllocator(8192))
            .channel(NioServerSocketChannel.class).handler(new LoggingHandler(LogLevel.DEBUG))
            .childHandler(new ChannelInitializer<SocketChannel>() {

                @Override
                protected void initChannel(SocketChannel ch) throws Exception {
                    ChannelPipeline cp = ch.pipeline();
                    SelfSignedCertificate cert = new SelfSignedCertificate();
                    SslContext cont = SslContext.newServerContext(cert.certificate(), cert.privateKey());
                    cp.addLast("ssl", cont.newHandler(ch.alloc()));

                    SelfSignedCertificate cert = new SelfSignedCertificate();
                    SslContext cont = SslContext.newServerContext(cert.certificate(), cert.privateKey());
                    //SslContext cont2 = SslContextBuilder.forServer(cert.privateKey(), cert.certificate()).build();
                    //SSLEngine engine = cont2.newEngine(ch.alloc());
                    //engine.setUseClientMode(true);;
                    //cp.addFirst("ssl", new SslHandler(engine));
                    cp.addFirst("ssl", cont.newHandler(ch.alloc()));

                    SelfSignedCertificate cert = new SelfSignedCertificate();
                    SslContext cont = SslContext.newServerContext(cert.certificate(), cert.privateKey());
                    SslContext cont2 = SslContextBuilder.forServer(cert.privateKey(), cert.certificate()).build();
                    SSLEngine engine = cont2.newEngine(ch.alloc());
                    //cp.addFirst("ssl", new SslHandler(engine));
                    cp.addFirst("ssl", cont.newHandler(ch.alloc()));