UnknownHostException: C

[Akash Singh]

I am getting "java.net.UnknownHostException: C", when invoking user help doc on Windows XP. Same code works fine on Linux and Windows 2000.
Here is my code:

 
 /**
     * holds url for user help file
     */
    private static final String DOCUMENTATION_URL = "file://"
                            + System.getProperty("user.dir")
                            + System.getProperty("file.separator")
                            + "userDocs"
                            + System.getProperty("file.separator")
                            + "ui"
                            + System.getProperty("file.separator")
                            + "LogOnUserDoc.htm";
 /**
     * Acts as Action Listener to invoke documents(help)
     */
    private class DocumentListener implements ActionListener {
        /**
         * Handles actionPerformed event initiated by help menu item
         *
         * @param event The event initiated by help menu item
         */
        public void actionPerformed(ActionEvent event) {
            try {
                    JEditorPane pane = new JEditorPane();
                    pane.setEditable(false);
                    pane.setPage(DOCUMENTATION_URL);
                    JScrollPane scroller = new JScrollPane();
                    scroller.getViewport().add(pane);
                    JDialog dialog = new JDialog(ConnectionUI.this,
                                                HELP_DIALOG_TITLE, false);
                    dialog.getContentPane().add(scroller);
                    dialog.pack();
                    setupScreenSizeLocation(10, 60, dialog);
                    dialog.setVisible(true);

            } catch (IOException e) {
                ConnectionUI.this.setCursor(defaultCursor);
                //errorMessage: System could not locate document;
                //check if document exists.
                String errMsg = UIResources.getMessage("CLN_ERR014");
                JOptionPane.showMessageDialog(null, errMsg,
                                              "",
                                              JOptionPane.ERROR_MESSAGE);
            }
        }
    }
 

Could any help me on this. Why am I getting this error on Windows XP.
Regards.
Akash

[Denis Spirin]

private static final String DOCUMENTATION_URL = "file://"
+ System.getProperty("user.dir")
+ System.getProperty("file.separator")
+ "userDocs"
+ System.getProperty("file.separator")
+ "ui"
+ System.getProperty("file.separator")
+ "LogOnUserDoc.htm";

I guess you get something like :
file://somePath\userDocs\ui\LogOnUserDoc.htm
Is it correct URL?
Regards
[ April 10, 2004: Message edited by: Denis Spirin ]

[Akash Singh]

Thanks Denis for your reply.
I am not able to resolve this issue. This problem only comes when I test
my FBN Assignment on XP. On Linux and Windows 2000, I get user help doc, that is an HTML page.

DOCUMENTATION_URL resolved as :
file://C:\scjd\userDocs\ui\LogOnUserDoc.htm
And my file is in this location. In fact with this URL(file://C:\scjd\userDocs\ui\LogOnUserDoc.htm) , IE browser displays the LogOnUserDoc.htm. I do'nt why it is not resolving this URL from the code on XP.
Below is the stack trace of the exception.
java.net.UnknownHostException: C
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.net.NetworkClient.doConnect(Unknown Source)
at sun.net.NetworkClient.openServer(Unknown Source)
at sun.net.ftp.FtpClient.openServer(Unknown Source)
at sun.net.ftp.FtpClient.<init>(Unknown Source)
at sun.net.www.protocol.ftp.FtpURLConnection.connect(Unknown Source)
at sun.net.www.protocol.ftp.FtpURLConnection.getInputStream(Unknown Sour
ce)
at javax.swing.JEditorPane.getStream(Unknown Source)
at javax.swing.JEditorPane.setPage(Unknown Source)
at javax.swing.JEditorPane.setPage(Unknown Source)
at suncertify.ui.ConnectionUI$DocumentListener.actionPerformed(Connectio
nUI.java:794)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(Unknow
n Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$MouseInputHandler.mouseRelease
d(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(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)
Regards,
Akash

[Denis Spirin]

Hi,
I think you should try using this URL:
file://C:/scjd/userDocs/ui/LogOnUserDoc.htm
I dont work on Windows so I m not sure. Anyway, in Java both URL and URI are not platform dependent, i.e. there s no need to use "file.separator" property. The same relates to RMI (which uses URL).
Hope it helps,

[Burk Hufnagel]

Originally posted by Akash Singh:
DOCUMENTATION_URL resolved as :
file://C:\scjd\userDocs\ui\LogOnUserDoc.htm
java.net.UnknownHostException: C
at java.net.PlainSocketImpl.connect(Unknown Source)

Regards,
Akash

I'm not a guru, but it looks to me like "C:" is being treated as a host name, as in HostName ort. Try dropping the "C:" and just use "\scjd\..." and see what happens.
Burk

[Akash Singh]

Thanks for reply Denis and Berk.
This is solved.
Actually is has to be :
file:///C:\scjd\userDocs\ui\LogOnUserDoc.htm

As per the URL syntax:
protocol://hostname/file
Since hostname part in blank in this case:
it will be "file:///file"
that is "file:///C:\scjd\userDocs\ui\LogOnUserDoc.htm".
But surprisingly, windows 2000 and Linux did not give any error with url "file://C:\scjd\userDocs\ui\LogOnUserDoc.htm". However Windowx XP is giving UnknowHostException for this url.
Regards,
Akask