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正常运行时代码无效,但在调试(eclipse)中工作

[英]Code not working when running normally, but working in debug (eclipse)

我真的很困惑:当我在eclipse中正常运行我的程序时,我的一些代码无法正常工作,但是当我使用调试模式单独运行每个步骤时,它确实工作了。

码:

public void showConnectDialog() {
    ConnectDialog connectDialog = new ConnectDialog();
    connectDialog.setVisible(true);
    //Until here, code runs
    while(! connectDialog.getConnected()) {};
    //The next line does only run in debug
    JOptionPane.showMessageDialog(connectDialog, "Connected", "Connected", JOptionPane.INFORMATION_MESSAGE);

}

连接器(一旦用户在对话框中点击“连接”)就启动(作为线程):

private class ServerConnector implements ActionListener, Runnable {

    @Override
    public void actionPerformed(ActionEvent e) {
        if (! IP_field.getText().equals("")) {
            if (! isConnecting) {
                new Thread(new ServerConnector(), "ServerConnector").start();

            }

        }
        else {
            JOptionPane.showMessageDialog(dialog, 
                                          "Enter an IP address", 
                                          "Enter IP", 
                                          JOptionPane.WARNING_MESSAGE);

        }

    }

    @Override
    public void run() {
        try {
            setConnecting(true);
            Socket socket = connect();
            if (socket != null) {
                ObjectOutputStream oOut = new ObjectOutputStream(socket.getOutputStream());
                ObjectInputStream oIn = new ObjectInputStream(socket.getInputStream());
                if (login(oOut, oIn)) {
                    isConnected = true;
                    setConnecting(false);

                }
                else {
                    socket.close();

                }

                setConnecting(false);

            }

        }
        catch (RSPException e) {
            e.printStackTrace();
            System.exit(1);

        }
        catch (Exception e) {
            //If an exception occurs, setConnecting() will be true. This 
            //not good, so it has to be set to false
            e.printStackTrace();
            setConnecting(false);

        }

    }

    private boolean login(ObjectOutputStream oOut, ObjectInputStream oIn) 
            throws ClassNotFoundException, IOException, RSPException {
        //Send login request action:
        oOut.writeObject(new LoginAction(ActionSender.CLIENT, getID(), 
                                         getPassword()));

        Object obj = oIn.readObject();
        if (obj instanceof LoginActionResult) {
            LoginActionResult result = (LoginActionResult) obj;
            if (result.getResult() == LoginResults.SUCCES) {
                return true;

            }
            else if (result.getResult() == LoginResults.FAIL_ON_ID) {
                JOptionPane.showMessageDialog(dialog, 
                                              "Invalid password or ID", 
                                              "Can't login", 
                                              JOptionPane.ERROR_MESSAGE);
                return false;

            }
            else if (result.getResult() == LoginResults.FAIL_ON_PASSWORD) {
                JOptionPane.showMessageDialog(dialog, 
                                              "Invalid password or ID", 
                                              "Can't login", 
                                              JOptionPane.ERROR_MESSAGE);
                return false;

            }
            else if (result.getResult() == LoginResults.SERVER_FULL) {
                JOptionPane.showMessageDialog(dialog, 
                                              "Couldn't connect: \n" +
                                              "Server is full", 
                                              "Failed to connect", 
                                              JOptionPane.WARNING_MESSAGE);
                return false;

            }
            else {
                return false;

            }

        }
        else {
            System.out.println(obj);
            throw new RSPException("Server is not following the protocol.");

        }

    }

    private void setConnecting(boolean connecting) {
        if (connecting) {
            SwingUtilities.invokeLater(new Runnable() {

                @Override
                public void run() {
                    connectButton.setEnabled(false);

                }
            });
            SwingUtilities.invokeLater(new Runnable() {

                @Override
                public void run() {
                    connectButton.setText("Connecting...");

                }
            });

        }
        else {
            SwingUtilities.invokeLater(new Runnable() {

                @Override
                public void run() {
                    connectButton.setText("Connect");

                }
            });
            SwingUtilities.invokeLater(new Runnable() {

                @Override
                public void run() {
                    connectButton.setEnabled(true);

                }
            });

        }

        isConnecting = connecting;

    }

    private String getAddressFromTextField() {
        return IP_field.getText();

    }

    private InetAddress getInetAddress(String fullAddress) {
        try {
            if (fullAddress.contains(":")) {
                String[] splitAddress = fullAddress.split(":");
                return InetAddress.getByName(splitAddress[0]);

            }
            else {
                return InetAddress.getByName(fullAddress);

            }
        }
        catch (UnknownHostException e) {
            return null;

        }

    }

    private int getPort(String fullAddress) {
        try {
            String[] splittedAddress = fullAddress.split(":");
            return Integer.valueOf(splittedAddress[1]);

        }
        catch (NumberFormatException ex) {
            return -1;

        }
        catch (NullPointerException 
             | ArrayIndexOutOfBoundsException 
             | PatternSyntaxException ex) {
            //Returning default port value: 25566, because no port was given
            return 25566;

        }

    }

    @SuppressWarnings("resource")
    private Socket connect() {
        Socket socket = null;

        InetAddress address = null;
        if ((address = getInetAddress(getAddressFromTextField())) == null) {
            return null;

        }
        int port = getPort(getAddressFromTextField());

        try {
            socket = new Socket(address, port);

        }
        catch (ConnectException e ) {
            Socket retrySocket = null;
            if ((retrySocket = retryConnect(address, port)) == null) {
                JOptionPane.showMessageDialog(dialog,
                                              "Connection timed out", 
                                              "Failed to connect", 
                                              JOptionPane.ERROR_MESSAGE);
                setConnecting(false);

            }
            else {
                socket = retrySocket;

            }

        }
        catch(IOException e) {
            e.printStackTrace();

        }

        return socket;

    }

    private Socket retryConnect(InetAddress address, int port) {
        Thread waitThread = new Thread(new Runnable() {

            @Override
            public void run() {
                try {
                    //Will wait 15(000) (milli)seconds before stopping with
                    //trying to connect.
                    //One second (1000 millis) is for debugging and testing
                    Thread.sleep(1000);

                }
                catch (InterruptedException e) {
                    e.printStackTrace();

                }

            }

        });

        waitThread.start();

        while (waitThread.isAlive()) {
            try {
                return new Socket(address, port);

            }
            catch (ConnectException e) {
                //Do nothing, will re-attempt to connect.

            }
            catch (IOException e) {
                e.printStackTrace();

            }

        }

        return null;

    }

    private String getID() {
        return ID_field.getText();

    }

    private String getPassword() {
        if (getID().equals("master")) {
            return "masterPassword";

        }
        else {
            return new String(passwordField.getPassword());

        }

    }

}

getConnected()一旦连接到服务器就返回true 连接器在单独的线程上运行。

编辑 :我试图将代码放入getConnected() while块,然后它工作。 为什么它会起作用而不是其他?

我有同样的问题,但有一些更多的规范。 代码在32位工作正常但我在64位有这个问题(我使用本机库所以我需要维护两者)。

我找到的解决方案是在while循环中添加Thread.sleep()。 我不知道它为什么会起作用,所以你的猜测和我的一样好。

更好的解决方案可能是实现观察者模式而不是无限循环。 但这需要一些重新分解。

我有一个非常类似的问题,一个“while”循环不会运行,那个循环是我的主要例程。 我如何得到循环运行是在循环中完成的第一件事是睡眠:

    try
        {Thread.sleep(0);}
    catch (Exception e)
        {e.printStackTrace();}

这足以让一切顺利。

正如其他答案所建议的那样,使用Thread.sleep()应该可以解决问题,但这不是一个非常好的方法。 相反,我们应该使用Thread.yield()

为什么yield而不sleep

请参阅: Thread.Sleep(0)和Thread.Yield()之间的区别以及Thread.sleep(0)和Thread.yield()语句是否相同?

为什么会这样?

当我们只运行线程时,操作系统将它们置于“空闲”状态,当它被“唤醒”时,它就不会。 另一方面,在调试模式下,我们有一个受控环境。 操作系统几乎无法控制它,因为一切都在逐步,缓慢地进行。 如果我们在没有任何断点的情况下运行调试几次,在几次成功运行之后,我们应该看到相同的效果。

我在UIAutomator中遇到了与UiObject2等待的问题(Until.findObject(),20)。

Thread.yield() - 适合我

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