java-programmer >>"NullPointerException". (was Re: ArrayOutOfbounds, how come?)

"NullPointerException". (was Re: ArrayOutOfbounds, how come?)

Index ‹ java-programmer

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- 1
  - Long delay using SSLSocketFactoryHi all,
    
    I need to do HTTPS requests from a WLS container through a proxy which
    requires encoded username/password authentication. Therefore, I am
    using an extension of SSLSocketFactory (part of SUN's JSSE), which
    does the proxy authentication for me and the tunnel handshake as well.
    
    Principally, the solution I thought of works. However, after starting
    the WLS, the very first connection to the proxy takes more than two
    minutes. Running the test once again, the connection to the proxy is
    established almost instantaneously. Can anyone explain the long delay
    in the first connection? It occurs when invoking method
    SSLSocketFactory.getDefault() (see the below code snippet).
    
    I scanned the port of the proxy and found no activity during the
    delay. Neither, there are any outgoing TCP packages from the source
    machine (where the JVM is running). So I assume that the delay is not
    due to a network problem; it must be somewhere in the depths of the
    JSSE classes.
    
    Best regards,
    Thomas Mantay
    
    Here is the code I am using:
    
    import java.net.*;
    import java.io.*;
    import java.security.*;
    import sun.misc.BASE64Encoder;
    import javax.net.*;
    import javax.net.ssl.*;
    
    public class SSLTunnelSocketFactory extends SSLSocketFactory {
    private String tunnelHost;
    private int tunnelPort;
    private SSLSocketFactory dfactory;
    private String tunnelPassword;
    private String tunnelUserName;
    private boolean socketConnected = false;
    private int falsecount = 0;
    
    /**
    * Constructor for the SSLTunnelSocketFactory object
    *
    *@param proxyHost The url of the proxy host
    *@param proxyPort the port of the proxy
    *@param proxyUserName username for authenticating with the
    proxy
    *@param proxyPassword password for authenticating with the
    proxy
    */
    public SSLTunnelSocketFactory(String proxyHost, int proxyPort,
    String proxyUserName, String proxyPassword) {
    NLUtil.ldebug("SSLTunnelSocketFactory", "Constructor", "creating
    Socket Factory with password/username");
    tunnelHost = proxyHost;
    tunnelPort = proxyPort;
    tunnelUserName = proxyUserName;
    tunnelPassword = proxyPassword;
    NLUtil.ldebug("SSLTunnelSocketFactory", "Constructor", "before
    getDefault()");
    
    Here is the line that causes the delay:
    
    dfactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
    NLUtil.ldebug("SSLTunnelSocketFactory", "Constructor", "after
    getDefault()");
    }
    
    /**
    * Gets the supportedCipherSuites attribute of the
    SSLTunnelSocketFactory
    * object
    *
    *@return The supportedCipherSuites value
    */
    public String[] getSupportedCipherSuites() {
    return dfactory.getSupportedCipherSuites();
    }
    
    /**
    * Gets the defaultCipherSuites attribute of the
    SSLTunnelSocketFactory
    * object
    *
    *@return The defaultCipherSuites value
    */
    public String[] getDefaultCipherSuites() {
    return dfactory.getDefaultCipherSuites();
    }
    
    /**
    * Gets the socketConnected attribute of the
    SSLTunnelSocketFactory object
    *
    *@return The socketConnected value
    */
    public synchronized boolean getSocketConnected() {
    return socketConnected;
    }
    
    /**
    * Creates a new SSL Tunneled Socket
    *
    *@param s Ignored
    *@param host destination host
    *@param port destination port
    *@param autoClose wether to close the socket
    automaticly
    *@return proxy tunneled socket
    *@exception IOException raised by an IO error
    *@exception UnknownHostException raised when the host is
    unknown
    */
    public Socket createSocket(Socket s, String host, int port,
    boolean autoClose)
    throws IOException, UnknownHostException {
    Socket tunnel = new Socket(tunnelHost, tunnelPort);
    doTunnelHandshake(tunnel, host, port);
    SSLSocket result = (SSLSocket) dfactory.createSocket(tunnel,
    host, port, autoClose);
    result.addHandshakeCompletedListener(
    new HandshakeCompletedListener() {
    public void handshakeCompleted(HandshakeCompletedEvent
    event) {
    NLUtil.ldebug("SSLTunnelSocketFactory", "handshakeCompleted",
    "Handshake Finished!");
    NLUtil.ldebug("SSLTunnelSocketFactory", "handshakeCompleted",
    "CipherSuite :" + event.getCipherSuite());
    NLUtil.ldebug("SSLTunnelSocketFactory", "handshakeCompleted",
    "SessionId: " + event.getSession());
    NLUtil.ldebug("SSLTunnelSocketFactory", "handshakeCompleted",
    "PeerHost: " + event.getSession().getPeerHost());
    setSocketConnected(true);
    }
    });
    // thanks to David Lord in the java forums for figuring out
    this line is the problem
    // result.startHandshake(); //this line is the bug which stops
    Tip111 from working correctly
    return result;
    }
    
    /**
    * Creates a new SSL Tunneled Socket
    *
    *@param host destination host
    *@param port destination port
    *@return tunneled SSL Socket
    *@exception IOException raised by IO error
    *@exception UnknownHostException raised when the host is
    unknown
    */
    public Socket createSocket(String host, int port)
    throws IOException, UnknownHostException {
    return createSocket(null, host, port, true);
    }
    
    /**
    * Creates a new SSL Tunneled Socket
    *
    *@param host Destination Host
    *@param port Destination Port
    *@param clientHost Ignored
    *@param clientPort Ignored
    *@return SSL Tunneled Socket
    *@exception IOException Raised when IO error occurs
    *@exception UnknownHostException Raised when the destination
    host is
    * unknown
    */
    public Socket createSocket(String host, int port, InetAddress
    clientHost,
    int clientPort)
    throws IOException, UnknownHostException {
    return createSocket(null, host, port, true);
    }
    
    /**
    * Creates a new SSL Tunneled Socket
    *
    *@param host destination host
    *@param port destination port
    *@return tunneled SSL Socket
    *@exception IOException raised when IO error occurs
    */
    public Socket createSocket(InetAddress host, int port)
    throws IOException {
    return createSocket(null, host.getHostName(), port, true);
    }
    
    /**
    * Creates a new SSL Tunneled Socket
    *
    *@param address destination host
    *@param port destination port
    *@param clientAddress ignored
    *@param clientPort ignored
    *@return tunneled SSL Socket
    *@exception IOException raised when IO exception occurs
    */
    public Socket createSocket(InetAddress address, int port,
    InetAddress clientAddress, int clientPort)
    throws IOException {
    return createSocket(null, address.getHostName(), port, true);
    }
    
    /**
    * Sets the socketConnected attribute of the
    SSLTunnelSocketFactory object
    *
    *@param b The new socketConnected value
    */
    private synchronized void setSocketConnected(boolean b) {
    socketConnected = b;
    }
    
    /**
    * Description of the Method
    *
    *@param tunnel tunnel socket
    *@param host destination host
    *@param port destination port
    *@exception IOException raised when an IO error occurs
    */
    private void doTunnelHandshake(Socket tunnel, String host, int
    port) throws IOException {
    NLUtil.ldebug("SSLTunnelSocketFactory", "doTunnelHandshake",
    "doTunnelHandshake start");
    OutputStream out = tunnel.getOutputStream();
    //generate connection string
    String msg = "CONNECT " + host + ":" + port + " HTTP/1.0\n"
    + "User-Agent: "
    + sun.net.www.protocol.http.HttpURLConnection.userAgent;
    if (!tunnelUserName.equals("") && !tunnelPassword.equals(""))
    {
    NLUtil.ldebug("SSLTunnelSocketFactory", "doTunnelHandshake",
    "Using proxy authencation with username '" + tunnelUserName + "' and
    password '" + tunnelPassword + "'.");
    //add basic authentication header for the proxy
    sun.misc.BASE64Encoder enc = new sun.misc.BASE64Encoder();
    String encodedPassword = enc.encode((tunnelUserName + ":"
    + tunnelPassword).getBytes());
    msg = msg + "\nProxy-Authorization: Basic " +
    encodedPassword;
    }
    msg = msg + "\nContent-Length: 0";
    msg = msg + "\nPragma: no-cache";
    
    msg = msg + "\r\n\r\n";
    
    NLUtil.ldebug("SSLTunnelSocketFactory", "doTunnelHandshake", "msg:
    " + msg);
    
    byte b[];
    try {
    //we really do want ASCII7 as the http protocol doesnt
    change with locale
    b = msg.getBytes("ASCII7");
    } catch (UnsupportedEncodingException ignored) {
    //If ASCII7 isn't there, something is seriously wrong!
    b = msg.getBytes();
    }
    out.write(b);
    out.flush();
    
    byte reply[] = new byte[200];
    int replyLen = 0;
    int newlinesSeen = 0;
    boolean headerDone = false;
    
    InputStream in = tunnel.getInputStream();
    boolean error = false;
    
    while (newlinesSeen < 2) {
    int i = in.read();
    if (i < 0) {
    throw new IOException("Unexpected EOF from Proxy");
    }
    if (i == '\n') {
    headerDone = true;
    ++newlinesSeen;
    } else
    if (i != '\r') {
    newlinesSeen = 0;
    if (!headerDone && replyLen < reply.length) {
    reply[replyLen++] = (byte) i;
    }
    }
    }
    
    //convert byte array to string
    String replyStr;
    try {
    replyStr = new String(reply, 0, replyLen, "ASCII7");
    } catch (UnsupportedEncodingException ignored) {
    replyStr = new String(reply, 0, replyLen);
    }
    
    //we check for connection established because our proxy
    returns http/1.1 instead of 1.0
    if (replyStr.toLowerCase().indexOf("200 connection
    established") == -1) {
    NLUtil.ldebug("SSLTunnelSocketFactory", "doTunnelHandshake",
    "replyStr: " + replyStr);
    System.err.println(replyStr);
    throw new IOException("Unable to tunnel through " +
    tunnelHost + ":" + tunnelPort + ". Proxy returns\"" + replyStr +
    "\"");
    }
    //tunneling hanshake was successful
    }
    
    }
- 1
  - Hashtable qWhen traversing an Enumeration of Hashtable keys, I know that modifying the
    HT can cause problems. But is doing lookups okay? E.g., in the following
    code:
    
    <assume ht is a reference to a Hashtable object>
    Enumeration e = ht.keys();
    Object o;
    while(e.hasmore()) {
    o = e.next();
    System.out.println(o + ": " + ht.get(o));
    }
    
    Is this guaranteed to print out all of the key-value pairs?
- 1
  - analytical Skill for Java Development> As an experiment, give an "experienced" developer a problem and watch
    > their
    > analytical and problem solving skills seriously fail him/her. This of
    > course, is the general case - there may be some corner cases where this
    > will
    > not occur.
    
    So how can one learn better problem solving skills? In addition to
    problem solving, where can one find better algorithms to use?
- 1
  - why allow multiple classes in one file?Hello,
    
    I'm pretty new to Java, so please don't yell at me if my question is
    dumb.
    
    Each public file should be in a separate file. I don't understand why
    is it allowed for a file contain additional non-public (default)
    classes. Why is it not one class per file, public or default?
    
    Thanks,
    Hilbert
- 1
  - Creating Object With Methods During RuntimeHello All,
    
    Is there a way to have a method create and name an object?
    
    If my question is not clear, what I mean is instead of this:
    
    ...
    Person abc = new Person();
    ...
    
    where the programmer specifies the name of the object and where in the
    program it is created, you have a method something like this:
    
    ...
    //the string that is passed to this method is generated by another
    //function which generates random strings - in other words, neither
    //the programmer nor the user are involved in this step directly
    
    private void createObject(String s)
    {
    Person s = new Person();
    }
    ...
    
    This might be used in a GUI simulation that is modeling the interaction
    of different species in an ecosystem, for example. At some point the
    user may wish to increase the complexity of the sim by adding more
    creatures of one type or another. They could press a button which would
    call the createObject function and insert another animal into the fray.
    
    I hope that is enough to sufficiently explain what I am asking, in any case.
    
    By the way, just in case you are wondering, I have not tested the
    example function above (I know it won't work as is). Normally I would
    try myself before asking here, but I don't have access to my PC right
    now and I can't find what I'm looking for on the internet.
    
    Thanks very much to any who can help.
    
    A
- 2
  - UIDefaults.getUI() failed for JInternalFrame$JDesktopIconI am using a particular Look and Feel, and a class derived from
    JInternalFrame. Whenever the JInternalFrame class is invoked, it generated
    an exception (please see stack trace at the bottom of this message).
    
    I know that to correct this exception, I must do something along the lines
    of the following:
    
    UIManager.put(XXX, YYY);// Where XXX is the String used to identify the
    JInternalFrame$JDesktopIcon's UIand YYY the ui class for it.
    
    However, I do not know how to go about discerning the values for XXX and
    YYY. How can I find those out? I have tried:
    UIManager.getLookAndFeelDefaults().put("ClassLoader",
    getClass().getClassLoader());
    UIManager.put("JDesktopIcon",
    javax.swing.JInternalFrame.JDesktopIcon.class.getName());
    UIManager.put("JInternalFrame",
    javax.swing.JInternalFrame.class.getName());
    updateUI();
    
    With no luck at al. Can someone please help me to find out what parameters I
    need to pass here? Thanks, Ike
    
    --------stack trace-----------------------
    UIDefaults.getUI() failed: no ComponentUI class for:
    javax.swing.JInternalFrame$JDesktopIcon[,0,0,0x0,invalid,hidden,alignmentX=0
    .0,alignmentY=0.0,border=,flags=0,maximumSize=,minimumSize=,preferredSize=]
    java.lang.Error
    at javax.swing.UIDefaults.getUIError(Unknown Source)
    at javax.swing.MultiUIDefaults.getUIError(Unknown Source)
    at javax.swing.UIDefaults.getUI(Unknown Source)
    at javax.swing.UIManager.getUI(Unknown Source)
    at javax.swing.JInternalFrame$JDesktopIcon.updateUI(Unknown Source)
    at javax.swing.JInternalFrame$JDesktopIcon.<init>(Unknown Source)
    at javax.swing.JInternalFrame.<init>(Unknown Source)
    at RalphVince.Controls.JScrollableDesktopPane.BaseInternalFrame.<init>()
- 4
  - how to map from display metrics to physical metrics...Suppose I have a screen which is 1024x768, how can I map this rectangle in
    pixels into physical world dimensions in meters or in inches? Actually I
    want to know the physical size of the viewable area of the monitor...
    
    Please help me...
- 5
  - JTextField : limit number of input charactersHi,
    
    How can I do limit the number of character into a JTextField component ? I'm
    a Newbie, and I've some problem with this.
    
    Other question, in a JTable, how can I do to put a DropDown into a field
    from a column ?
    
    Thanks for all
    
    Bernard
- 6
  - Final member troubleimport java.awt.Image;
    import javax.imageio.ImageIO;
    import java.io.*;
    
    public class FinalTryCatch {
    
    final Image someImage;
    
    public FinalTryCatch() {
    try {
    someImage = ImageIO.read(new File("someImageFile.gif"));
    } catch (IOException ioe) {
    someImage = null;
    }
    }
    
    public static void main(String[] args) {
    FinalTryCatch f = new FinalTryCatch();
    // Do some stuff
    }
    }
    
    This fails to compile with "variable someImage might already have been
    assigned" on "someImage = null;". Remove that line and it complains,
    "variable someImage might not have been initialized". Obviously. What would
    you do in this situation? Make the variable non-final? Have the constructor
    throw IOException? Something else?
- 6
  - aliasHi,
    
    I may be jumping guns here. I mean I'm totally new to java and yet, I
    feel the need to do something like this for typing much less,
    
    o = System.out.println; // problem, what data type for var of o here?
    undefined.
    or
    alias o = System.out.println; // alias is supposed to be a special
    command or the sort?
    
    then, I do something like this
    
    for (int i=0; i < 5; i++) {
    switch(i)
    case 0:
    case 2:
    case 4:
    o(i + " is an even number"); // instead of System.out.println(i +
    " is an even number");
    break;
    case 1:
    case 3:
    case 5:
    o(i + " is an odd number"); // instead of System.out.println(i + "
    is an odd number");
    break;
    default:
    o(i + " is neither an odd nor even number");
    // instead of System.out.println(i + " is neither an odd nor even
    number");
    }
    
    Doable? How? TIA.
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  - Secure FTP supported by Jakarta Commons Net?Does the FTP feature in Jakarta Commons/NET component support the
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  - Bug or featureHi, can someone explain the behaviour of that snip
    
    public class Test
    {
    public static void main(String[] args)
    {
    
    try
    {
    Class c = Class.forName("BUG");
    }
    catch (ClassNotFoundException e)
    {
    }
    System.out.println("Everything works?");
    
    try
    {
    Class c = Class.forName("NotbUg");
    }
    catch (ClassNotFoundException e)
    {
    }
    System.out.println("Still works?");
    
    try
    {
    Class c = Class.forName("bUg");
    }
    catch (ClassNotFoundException e)
    {
    }
    System.out.println("Everything works!!");
    }
    }
    
    class BUG
    {
    }
    
    In not works on JDK 1.4.2 but JDK 1.1.4. Bug or feature that question is.
    
    Thanks in advance.
    
    Serge
- 12
  - converting paper space to model space in dxf filesHello wise guys!
    
    I'm writing a piece of code (java) that shold parse and draw the
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  - JavaScript for MaximizationHi. I want onLoad(), to make my current IE window "maximized." I can resize
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- 16
  - Swing - how to catch all eventsProgramming in java for a while now, but I still have this silly
    problem that I don't know if the experts has a simple answer.
    
    I have a Swing app. Yes, simple stuff eh. Next, user logins to use
    the app. If they don't do anything (mouse move, key press) for a
    while, then I log out. The think is that detecting a mouse event, I
    have to register with each of the tabpane of the app. I don't like
    that. Also, I have to register with each components within the panel.
    The same for keyboard. For keyboard, it seems I can register event
    for just any component (with appropriate modifer to get the input map
    and action map). However, I still have to register all keys which are
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    I solve this simple and common problem? Thank you very much in
    advance.

Author

Message

V S Rawat

Posted: 2004-6-19 1:22:00

Top

java-programmer, "NullPointerException". (was Re: ArrayOutOfbounds, how come?) Mark Haase wrote:
>
> What exception, exactly?? Your subject says
> "ArrayOutOfBounds" but the catch block is
> "NullPointerException".

you got it right. it is indeed "NullPointerException".
mea culpa.

> You shouldn't be getting ArrayOutOfBoundsException, but
> your code will generate a NPE everytime because of a
> noobie mistake that you're making.

what is noobie?

> Below, you initialize a new array of JButton references,
> but each reference is still null.
>
>> button = new JButton[8][14];
>
> You need to put an object in each one of them before you
> start making calls like:
>
>
>> button[gridY1][gridX1].setText(button_text);
>
> How can you call setText on an object that doesn't exist?
> You can't. The runtime lets you know by throwing NPE.
>
> Do this:
>
> for (int i=0; i<8; i++)
> for (int j=0; j<14; j++)
> button[i][j] = new JButton();
>
> In the future, be more specific when you say "I have an
> error!! help!"..Name the exact error.

done.

no way. After changing to the following, it compiled pretty
well, but is still giving npe at = line.
-------------
JButton[][] button;
-----------------
for (int gridY1 = 0; gridY1 < d_rows; gridY1++) {
for (int gridX1 = 0; gridX1 < d_columns;
gridX1++) {
button[gridY1][gridX1] = new JButton();
}
}
-------------
when I changed the above block according to what was
suggested by Mr John in another thread of Mr Mike:
-------------
JButton[][] button = new JButton[d_rows][d_columns];
for (int gridY1 = 0; gridY1 < d_rows; gridY1++) {
for (int gridX1 = 0; gridX1 < d_columns;
gridX1++) {
button[gridY1][gridX1] = new JButton();
}
}
-------------
it again got compiled flawlessly, but I got npe at a further
line where I am refering a button for the first time:
------------
button[gridY1][gridX1].setText(button_text);
------------

what next?

-rawat

Roedy Green

Posted: 2004-6-19 3:56:00

Top

java-programmer >> "NullPointerException". (was Re: ArrayOutOfbounds, how come?) On Fri, 18 Jun 2004 22:52:21 +0530, V S Rawat <email***@***.com>
wrote or quoted :

>what is noobie?

see http://mindprod.com/jgloss/newbie.html

--
Canadian Mind Products, Roedy Green.
Coaching, problem solving, economical contract programming.
See http://mindprod.com/jgloss/jgloss.html for The Java Glossary.

Index ‹ java-programmer

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- 2
  - X3D and Java3DDoes anyone know if there are debs for X3D and Java3D that will work
    with Sarge? It seems that X3D depends on Java3D. I have the X3D jar
    but would prefer if possible to have a deb. I can't find either for
    Java3D and Sarge, the jars seem to be all for Woody. I know I'll need
    the nVidia drivers for my TNT2 card for this to work, but I think I can
    get those (if I can figure out which of the legacy drivers will work).
    
    I have the Sun 1.5 jre and sdk.
    
    Thanks!
    
    --
    Blessings
    
    Wulfmann
    
    Wulf Credo:
    Respect the elders. Teach the young. Co-operate with the pack.
    Play when you can. Hunt when you must. Rest in between.
    Share your affections. Voice your opinion. Leave your Mark.
    
    --
    To UNSUBSCRIBE, email to email***@***.com
    with a subject of "unsubscribe". Trouble? Contact email***@***.com
- 3
  - Binary distro o' java (freebsdfoundation down)So I was disheartened a few weeks ago to see:
    
    March 11, 2005 - www.FreeBSDFoundation.org temporarily unavailable due to hardware failure.
    Due to a hardware failure, the FreeBSD Foundation web site is temporarily unavailable. The full site will be restored within a few days.
    
    But I was looking forward to the site coming back up and being able to pull down some binary java packages. Alas, no-go yet. Can anyone point me to a recent binary package that will work on 4-STABLE?
    
    -Yanek.
    --
    ___________________________________________________________
    Sign-up for Ads Free at Mail.com
    http://promo.mail.com/adsfreejump.htm
- 4
  - Empty cacerts file installed by jdk-1.4.2p5 port causedThis is a multi-part message in MIME format.
    
    ------=_NextPart_000_0039_01C3BE43.75A7BFC0
    Content-Type: text/plain;
    charset="Windows-1252"
    Content-Transfer-Encoding: quoted-printable
    
    Hello,
    
    I was successfully running an SSL-enabled application on the Linux =
    version of JDK 1.4 on FreeBSD 4.8-STABLE, and decided to go native. When =
    I built the native JDK and ran my app on it, I got the following =
    exception when it attempted to open an SSL connection to a host the =
    Linux JDK had never had trouble connecting to:
    
    sun.security.validator.ValidatorException: No trusted certificate found
    
    After some research, I tracked down the problem to the =
    jre/lib/security/cacerts file installed by the jdk-1.4.2p5 port: it was =
    only 32 bytes in size and contained no certificates. I copied the =
    cacerts file from the Linux JDK's directory and that fixed the problem.
    
    Is this a known issue? Or am I the only human being in the world to ever =
    have this problem? I have attached the cacerts file installed by the =
    port.
    
    Please reply to the list only, for my supplied address is fake.
    
    Thanks,
    Nick
    
    ---
    MSN2Go - Web-based MSN Messenger client
    http://www.msn2go.com/
    
    ------=_NextPart_000_0039_01C3BE43.75A7BFC0
    Content-Type: application/octet-stream;
    name="cacerts.bak"
    Content-Transfer-Encoding: base64
    Content-Disposition: attachment;
    filename="cacerts.bak"
    
    /u3+7QAAAAIAAAAA4mhuRftD36TZkt1BzrayHGMw15I=
    
    ------=_NextPart_000_0039_01C3BE43.75A7BFC0
    Content-Type: text/plain; charset="us-ascii"
    MIME-Version: 1.0
    Content-Transfer-Encoding: 7bit
    Content-Disposition: inline
    
    _______________________________________________
    email***@***.com mailing list
    http://lists.freebsd.org/mailman/listinfo/freebsd-java
    To unsubscribe, send any mail to "email***@***.com"
    
    ------=_NextPart_000_0039_01C3BE43.75A7BFC0--
- 5
  - Graphics Line WidthNew to java Graphics, have been having a play, and have some good results,
    but only very basic.
    
    I can draw the primitive shapes, and fill them with a variety of fill
    effects.
    
    what I want to do is change the line thickness or width, very easy I'm sure
    but no where I've looked can help with this.
    
    any suggestions on this, and books for 2D graphics, available in the UK most
    gratefully appreciated.
    
    Thanks Deb
    
    ---
    Outgoing mail is certified Virus Free.
    Checked by AVG anti-virus system (http://www.grisoft.com).
    Version: 6.0.580 / Virus Database: 367 - Release Date: 06/02/2004
- 6
  - Applets on Sun site?Has anybody seen actual applets on Sun's
    site recently? Got any URL's?
    
    I went in search of them on the site recently.
    
    I found lots of _images_ of applets,
    as well as broken _links_ to applets,
    their was a slew of applet _code_ and
    many references to the applet _html tag_,
    but I could not find a single _applet_.
- 7
  - Using the network package for multicastingHi,
    
    Can someone point me out to a good article on how to create/use IP
    multicasting in Java applications? I'm interested in developing a
    program that will use it. Thanks
    
    Sona
- 8
  - Regex for finding a '?' in a StringIm trying to write a routine to replace the '?' in a String with values
    supplied by the client.
    
    ie
    
    String myString = "Hello there, my first name is ? and my surname is
    ?";
    String myRegex = "<a regex>";
    myString = myString.replaceFirst(myRegex, "David");
    myString = myString.replaceFirst(myRegex, "Bevan");
    System.out.println(mString);
    
    Required output is "Hello there, my first name is David and my surname
    is Bevan"
    
    What do i need as myRegex?
    
    Many thanks
    
    David Bevan
    http://www.davidbevan.co.uk
- 9
  - URGENT: JDeveloper : Error in Updation through ViewObjectHi
    
    I am getting a very simple but annoying problem. I have made a
    business component project in which I have created a ViewObject named
    "CountryView" using table in SQL Server. Table consists only two
    columns CountryId (which is primary) and CountryName.
    
    Uptill this it is smooth But when I test CountryView using Application
    I am getting error in updating a record. When I change countryName
    [haven't touched countryId] and then try to move on to next record, I
    get error "FOR UPDATE clause cannot be specified with READ ONLY
    CURSOR".
    
    I read some docs on net and get to know that I have to set application
    module's locking mode : optimistic. I did this and I can now move on
    to next record. But when I try to commit data I again get the same
    error i.e. "FOR UPDATE clause cannot be specified with READ ONLY
    CURSOR". I have tried it with two Drivers "Microsoft" and "DataDirect"
    but it has been of no use.
    
    I am using
    RDBMS : SQL SERVER
    SQL Flavor : SQL92
    Made view by selecting table from database
    Connection url :
    jdbc:microsoft:sqlserver://localhost:1433;SelectMethod=cursor;DatabaseName=june07
    
    You may use SelectMethod=direct. This error still comes. Strange thing
    is when I try the same thing on an Oracle Server and with SQL Flavour
    Oracle then it works fine.
    
    I would like to get the answers of following Qs.
    
    1. Why JDeveloper APIs use a "Select FOR UPDATE" query when I have
    called for commit and not just moving on to next record after
    updating. There must be some queries to check if the record has been
    locked by someone else.
    
    2. Am I using a wrong Driver / doing something [incorrect / foolish]
    or it is just a myth that JDeveloper + ADF APIs and SQL server are
    compatible using a third party Driver.
    
    and finally i will be grateful if someone can tell me how to bypass
    this.
    
    Thanks
    Nitin Goyal
- 10
  - "new" [<TypeArguments>] <ClassOrInterfaceType> "(" [<ArgumentList>] ")" According to
    
    http://java.sun.com/docs/books/jls/third_edition/html/expressions.html#15.9
    
    the following production holds
    
    <ClassInstanceCreationExpression> ::=
    "new" [<TypeArguments>] <ClassOrInterfaceType> "(" [<ArgumentList>] ")"
    
    What would be an example for a class instance creation expression
    with type arguments? Here's a reminder about those:
    
    <TypeArguments> ::=
    "<" <TypeArgument> {"," <TypeArgument>} ">"
    
    What I would understand would be:
    
    <ClassInstanceCreationExpression> ::=
    "new" <ClassOrInterfaceType> [<TypeArguments>] "(" [<ArgumentList>] ")"
- 11
  - problem with two JFrameI have a JFrame vith various JPanel. Attached to a component there's a
    listener. When double-click occured a second JFrame will open. If i
    close this with X all application go closed. Why why why why?!?!??!
    I want close second JFrame but not first! :-(
    
    Bye!
    
    - Simone -
    P.s. ...and always sorry for my bad english.
- 12
  - hibernate w/derby simple crudhi-
    
    i am really new to hibernate.
    i thought it would be cool to use in my hobby.
    i want to make the code that deals with the db more readable in my projects.
    i hope hibernate can help me in that regard.
    
    i am trying to add a record?
    i get an error that says attempting to modify an identity column.
    i didnt specify the identity column in my constructor call.
    
    i saw how to iterate through the table (read using HQL) but am looking
    for an example of create,update, delete. i am missing the example
    somewhere in my book (hibernate in action).
    
    with delete i probably just set part of a collection to null....right?
    
    if i can get help on this identity column issue, i may be able to figure the
    examples out myself.
    thank you,
    jim
    
    Session session = HibernateUtil.getSessionFactory().openSession();
    Transaction tx = session.beginTransaction();
    Date d1 = new Date(2006-10-14);
    Date d2 = new Date(2006-10-15);
    Accounts accounts = new Accounts("boo",d1,d2);
    
    session.save(accounts);
    tx.commit();
    session.close();
    
    --------------------------------------------------------------------------
    // pojo
    package bcalcpkg;
    // Generated Jan 6, 2007 1:38:27 AM by Hibernate Tools 3.2.0.beta8
    import java.util.Date;
    import javax.persistence.Column;
    import javax.persistence.Entity;
    import javax.persistence.Id;
    import javax.persistence.Table;
    import javax.persistence.Temporal;
    import javax.persistence.TemporalType;
    import javax.persistence.GeneratedValue;
    /**
    * Accounts generated by hbm2java
    */
    @Entity
    @org.hibernate.annotations.Entity(
    dynamicInsert = true, dynamicUpdate = true)
    @Table(name = "ACCOUNTS", schema = "USER1", uniqueConstraints = {})
    public class Accounts implements java.io.Serializable {
    // Fields
    @Id @GeneratedValue
    @Column(name = "ACCOUNTID")
    private int accountid;
    @Column(name = "ACCOUNTNAME")
    private String accountname;
    @Column(name = "ACCOUNTOPEN")
    private Date accountopen;
    @Column(name = "ACCOUNTCLOSE")
    private Date accountclose;
    
    // Constructors
    /** default constructor */
    public Accounts() {
    }
    /** minimal constructor */
    public Accounts(int accountid, String accountname, Date accountopen) {
    this.accountid = accountid;
    this.accountname = accountname;
    this.accountopen = accountopen;
    }
    /** full constructor */
    public Accounts( String accountname, Date accountopen,
    Date accountclose) {
    //this.accountid = accountid;
    this.accountname = accountname;
    this.accountopen = accountopen;
    this.accountclose = accountclose;
    }
    //public Accounts(String text) {
    //this.text = text;
    //}
    
    // Property accessors
    @Id
    @Column(name = "ACCOUNTID", unique = true, nullable = false, insertable =
    true, updatable = true)
    public int getAccountid() {
    return this.accountid;
    }
    public void setAccountid(int accountid) {
    this.accountid = accountid;
    }
    @Column(name = "ACCOUNTNAME", unique = false, nullable = true, insertable =
    true, updatable = true, length = 50)
    public String getAccountname() {
    return this.accountname;
    }
    public void setAccountname(String accountname) {
    this.accountname = accountname;
    }
    @Temporal(TemporalType.DATE)
    @Column(name = "ACCOUNTOPEN", unique = false, nullable = true, insertable =
    true, updatable = true, length = 10)
    public Date getAccountopen() {
    return this.accountopen;
    }
    public void setAccountopen(Date accountopen) {
    this.accountopen = accountopen;
    }
    @Temporal(TemporalType.DATE)
    @Column(name = "ACCOUNTCLOSE", unique = false, nullable = true, insertable
    = true, updatable = true, length = 10)
    public Date getAccountclose() {
    return this.accountclose;
    }
    public void setAccountclose(Date accountclose) {
    this.accountclose = accountclose;
    }
    
    }
- 13
  - what needed for j2me
    
    hi all, I'm starting developing stuff for siemens c55, but for starting
    I'd like to know what do I need to have to develop...
    I've got j2dsk1.4.2 but when I call javax it says it doesn't exist...
    what do I need to have in order to get my laptop undergoing on cell
    phone SW????
    
    nuno silva
- 14
  - Cloning JDBC connection?In a JDBC appllication I want to create a second connection, which I
    can run some queries while some longer queries hang on the primary
    connection. Surprisingly, I fail to see an easy way to create a second
    connection. The matter is as simple as getting user, pwd and url, but
    how to get those? The Connection interface doesn't have this info; the
    implementation class oracle.jdbc.driver.T4CConnection has it. It is a
    hidden class, however. DatabaseMetadata has everything but pwd.
- 15
  - any LWP::UserAgent equivalent in java && a java regex questionHi All
    
    I have found Perl's LWP::UserAgent and related packages useful. Does
    java have any thing
    equivalent i.e. that won't make me do encoding when I want to do an
    http POST? I am a newbie
    to java. Also, is there anything like java CPAN ?
    
    Also, in perl, if I do /some pattern (some other pattern)/ I get "some
    other pattern" in $1. I found
    out that () have different meanings in Java. The only to get $1 in
    Java is to write more lines.
    
    Thanks in advance
    
    Z. M. Wu