Question

我们刚刚从Sun更新了我们的服务器，运行Solaris 9,32位。（安装在2005年）到新的CentOS 5，（linux）64位。

最新的Java版本是1.6.0_20（但我们不再能够访问有关旧版Java的信息）。

Java applet（OPMClient）的一部分开始抛出IOExeption：

import java.applet.*;
import java.awt.*;
import java.net.*;
import java.io.*;
import java.util.*;

public class OPMClient extends Applet {
    ...
    public static final int PORT = 8888;
    MineCanvas minecanvas;
    ...
    public void clientSend() {
    try {
        s = new Socket(this.getCodeBase().getHost(), PORT);
        in = new DataInputStream(s.getInputStream());
        out = new DataOutputStream(s.getOutputStream());
        listener = new SolutionListener(in, minecanvas);
    }
    catch (IOException e) {e.printStackTrace();} //showStatus("IOException in clientSend()");}
    ...
    }        

    public boolean action(Event e, Object arg) {
    ...
    if (arg.equals("Submit")) {
    if (action(null, "Update Grid")) {
        minecanvas.Submit();
    } else {
        return true;
    }
}
     ...
}

class MineCanvas extends Canvas {
    ...
    public void Submit() {
    if (position == -1) {
        errorString = "No ore has been entered!";
        mode = ERROR;
        repaint();
    } else {
        ComputeGridValue();
        parent.clientSend();
    }
}
    ...
   }

我们试图弄清楚为什么会这样，但经过几个小时的努力，没有成功。任何人都可以帮助我们解决这个问题吗？堆栈跟踪在

之下

java.net.ConnectException: Connection timed out: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at OPMClient.clientSend(OPMClient.java:128)
at MineCanvas.Submit(OPMClient.java:423)
at OPMClient.action(OPMClient.java:118)
at java.awt.Component.handleEvent(Unknown Source)
at java.awt.Component.postEvent(Unknown Source)
at java.awt.Component.postEvent(Unknown Source)
at java.awt.Component.postEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Exception in thread "AWT-EventQueue-2" java.lang.NullPointerException
at OPMClient.clientSend(OPMClient.java:138)
at MineCanvas.Submit(OPMClient.java:423)
at OPMClient.action(OPMClient.java:118)
at java.awt.Component.handleEvent(Unknown Source)
at java.awt.Component.postEvent(Unknown Source)
at java.awt.Component.postEvent(Unknown Source)
at java.awt.Component.postEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.awt.EventQueue$2.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

非常感谢。 P.S。：希望这不是一个明显的问题。

真诚的，你的，颜

Answer 1

哪个特定行抛出IOException？你能不能抓住它，所以我知道吗？行“s = new Socket（this.getCodeBase（）。getHost（），PORT）;”如果在创建套接字时发生I / O错误，则会抛出它，可能是因为this.getCodeBase（）有一个I / O异常（可能是因为坏的url？）。如果在创建输入流时发生I / O错误，套接字关闭，套接字未连接或套接字输入已使用shutdownInput（）关闭，则IOException将仅发生在输入流部分中。同样，如果在创建输出流时发生I / O错误或者套接字未连接，它只会出现在输出流部分。

Java：服务器更新后的IOException

1 个答案: