当socket.bind（）被调用时，应用程序关闭 - Android上的JeroMQ

Question

我是新来的编程与消息队列一般，我一直在尝试使用ZeroMQ简单的Android应用程序。我在单独的线程中在同一设备上运行服务器和客户端程序。这是我的Server类：

public class ZeroMQServer implements Runnable{ 
private Handler uiThreadHandler; 

public ZeroMQServer(Handler uiThreadHandler) { 
    this.uiThreadHandler = uiThreadHandler; 
} 

@Override 
public void run() { 
    ZMQ.Context context = ZMQ.context(1); 
    ZMQ.Socket socket = context.socket(ZMQ.REP); 
    socket.bind("tcp://*:5570"); 

    while(!Thread.currentThread().isInterrupted()) { 
     byte[] msg = socket.recv(0); 
     uiThreadHandler.sendMessage(
       Util.bundledMessage(uiThreadHandler, new String(msg))); 
     socket.send(Util.reverseInPlace(msg)+"", 0); 
    } 
    socket.close(); 
    context.term(); 
} 

这是客户端类：

public class ZeroMQMessageTask extends AsyncTask<String, Void, String> { 
private final Handler uiThreadHandler; 

public ZeroMQMessageTask(Handler uiThreadHandler){ 
    this.uiThreadHandler = uiThreadHandler; 
} 

@Override 
protected String doInBackground(String... params) { 
    ZMQ.Context context = ZMQ.context(1); 
    ZMQ.Socket socket = context.socket(ZMQ.REQ); 
    socket.connect("tcp://localhost:5570"); 

    socket.send(params[0].getBytes(), 0); 
    String result = new String(socket.recv(0)); 

    socket.close(); 
    context.term(); 

    return result; 
} 

@Override 
protected void onPostExecute(String result) { 
    uiThreadHandler.sendMessage(Util.bundledMessage(uiThreadHandler, result)); 
} 

这是主要活动的启动在另一个线程服务器，并实现了clickListener调用的代码段客户。

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    textView = (TextView)findViewById(R.id.text_console); 
    editText = (EditText)findViewById(R.id.text_message); 

    new Thread(new ZeroMQServer(serverMessageHandler)).run(); 

    findViewById(R.id.button_send_message).setOnClickListener(
      new View.OnClickListener() { 
       @Override 
       public void onClick(View v) { 
        new ZeroMQMessageTask(clientMessageHandler).execute(getTaskInput()); 
       } 

       protected String getTaskInput() { 
        return editText.getText().toString(); 
       } 
      }); 
} 

我遇到的问题是，只要应用程序启动，它就会自动关闭。当我从服务器上删除socket.bind("tcp://*:5570");行时，它不再关闭，但也不能按照它应有的方式工作，因为服务器不会听。

我同时在清单中授予了INTERNET和ACCESS_WIFI_STATE权限。

在这个问题上的任何帮助表示赞赏。

编辑： 我已经把断点在.bind()线，这是我得到的错误：

Didn't find class "java.net.StandardProtocolFamily" on path: 
    DexPathList[ 
    [zip file "/data/app/com.example.victor.zeromqrabbitmq-1/base.apk", 
    zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_dependencies_apk.apk", 
    zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_0_apk.apk", 
    zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_1_apk.apk", 
    zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_2_apk.apk", 
    zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_3_apk.apk", 
    zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_4_apk.apk", 
    zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_5_apk.apk", 
    zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_6_apk.apk", 
    zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_7_apk.apk", 
    zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_8_apk.apk", 
    zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_9_apk.apk" 
    ], 
    nativeLibraryDirectories=[ 
    /data/app/com.example.victor.zeromqrabbitmq-1/lib/arm, 
    /vendor/lib, /system/lib 
    ] 
    ] 

EDIT2：全logcat的错误：

09-01 00:44:19.878 13082-13205/com.example.victor.zeromqrabbitmq E/Error: Exception: 
09-01 00:44:20.188 13082-13205/com.example.victor.zeromqrabbitmq E/AndroidRuntime: FATAL EXCEPTION: 
     AsyncTask #1 
     Process: com.example.victor.zeromqrabbitmq, PID: 13082 
     java.lang.RuntimeException: An error occurred while executing doInBackground() 
      at android.os.AsyncTask$3.done(AsyncTask.java:309) 
      at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354) 
      at java.util.concurrent.FutureTask.setException(FutureTask.java:223) 
      at java.util.concurrent.FutureTask.run(FutureTask.java:242) 
      at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234) 
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) 
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) 
      at java.lang.Thread.run(Thread.java:818) 
     Caused by: java.lang.NoClassDefFoundError: Failed resolution of: Ljava/net/StandardProtocolFamily; 
      at zmq.io.net.tcp.TcpAddress.family(TcpAddress.java:50) 
      at zmq.io.net.tcp.TcpListener.setAddress(TcpListener.java:171) 
      at zmq.SocketBase.bind(SocketBase.java:363) 
      at org.zeromq.ZMQ$Socket.bind(ZMQ.java:2333) 
      at com.example.victor.zeromqrabbitmq.ZeroMQServer.doInBackground(ZeroMQServer.java:24) 
      at com.example.victor.zeromqrabbitmq.ZeroMQServer.doInBackground(ZeroMQServer.java:10) 
      at android.os.AsyncTask$2.call(AsyncTask.java:295) 
      at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
      at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234) 
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) 
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) 
      at java.lang.Thread.run(Thread.java:818) 
     Caused by: java.lang.ClassNotFoundException: Didn't find class "java.net.StandardProtocolFamily" on path: DexPathList[[zip file "/data/app/com.example.victor.zeromqrabbitmq-1/base.apk", zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_dependencies_apk.apk", zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_0_apk.apk", zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_1_apk.apk", zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_2_apk.apk", zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_3_apk.apk", zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_4_apk.apk", zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_5_apk.apk", zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_6_apk.apk", zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_7_apk.apk", zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_8_apk.apk", zip file "/data/app/com.example.victor.zeromqrabbitmq-1/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[/data/app/com.example.victor.zeromqrabbitmq-1/lib/arm, /vendor/lib, /system/lib]] 
      at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56) 
      at java.lang.ClassLoader.loadClass(ClassLoader.java:511) 
      at java.lang.ClassLoader.loadClass(ClassLoader.java:469) 
      at zmq.io.net.tcp.TcpAddress.family(TcpAddress.java:50) 
      at zmq.io.net.tcp.TcpListener.setAddress(TcpListener.java:171) 
      at zmq.SocketBase.bind(SocketBase.java:363) 
      at org.zeromq.ZMQ$Socket.bind(ZMQ.java:2333) 
      at com.example.victor.zeromqrabbitmq.ZeroMQServer.doInBackground(ZeroMQServer.java:24) 
      at com.example.victor.zeromqrabbitmq.ZeroMQServer.doInBackground(ZeroMQServer.java:10) 
      at android.os.AsyncTask$2.call(AsyncTask.java:295) 
      at java.util.concurrent.FutureTask.run(FutureTask.java:237) 
      at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234) 
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) 
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) 
      at java.lang.Thread.run(Thread.java:818) 
      Suppressed: java.lang.ClassNotFoundException: java.net.StandardProtocolFamily 
      at java.lang.Class.classForName(Native Method) 
      at java.lang.BootClassLoader.findClass(ClassLoader.java:781) 
      at java.lang.BootClassLoader.loadClass(ClassLoader.java:841) 
      at java.lang.ClassLoader.loadClass(ClassLoader.java:504) 
        ... 13 more 
     Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available 
09-01 00:44:20.699 13082-13206/com.example.victor.zeromqrabbitmq E/Surface: getSlotFromBufferLocked: unknown buffer: 0xb810d418 

看起来像一个简单的classNotFound错误，但是它引用了一个带有“android package”的类，这意味着它不属于任何外部库。那么怎么可能找不到？

Answer 1

您遇到的问题是您使用的JeroMQ版本与Android不兼容。此拉取请求：https://github.com/zeromq/jeromq/pull/471添加了对Android 10及更高版本的支持，但仅适用于0.4.3-SNAPSHOT。

Answer 2

也许删除*与本地主机

Answer 3

规则0替换）习惯于总是使用调用一个Poller.poll(aTimeoutInMILLISECONDs)方法，以保持在什么事件需要得到服务的控制（如果有的话）的外部事件循环的生态系统

规则1）内切勿使用在严重的，生产级代码REQ/REP，because of it's inherent hard-wired affinity to fall into an un-salvageable mutual dead-lock.

规则2）始终偏好显式地址.bind()-s。隐式扩展和通配符扩展不适用于策划的生产级部署，因为系统将依赖于外部翻译 - 而不是外部翻译 - 而不是外部翻译 - 而不是一个明确的全球广告地址（即使教科书示例显示其他练习...）

规则3）不要犹豫，使用assert();或try:/except:处理实践中，这样就可以充分足够的定位和诊断任何异常的根本原因。ZeroMQ错误工具在大多数语言绑定中都可用。