java-programmer >>Java server performance

Java server performance - jeety

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- 1
  - Did anyone upload file to php server by using swing applet before? Need help!!!Hi,
    
    I need a help. Recently I wrote a swing applet for uploading files to
    php server. It seems that everything is fine now. I can get the exactly
    same size files in the server. For text file, there is no any problem
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    and etc.), those files can not be openned after they are uploaded to
    sever even the size is exactly the same as orignal files.
    I think that it should be caused by "Content-Type".
    For testing, I change my Content-Type to "image/gif" to send gif files.
    However, the problem is still there. Now, I have no idea about this
    problem. Could any one give me a favor? Thanks in advance!!!
    
    I attached the code related to connection and sending data here for
    your review.
    
    public boolean upload() throws Exception{
    boolean done = false;
    String file_name = file.getName();
    String file_data = readFile();
    
    StringBuffer response = new StringBuffer("");
    
    OutputStream os = null;
    BufferedReader in = null;
    HttpURLConnection conn = null;
    
    try{
    URL serverURL = new URL(url);
    // connect to server
    URLConnection uc = serverURL.openConnection();
    conn = (HttpURLConnection) uc;
    conn.setAllowUserInteraction(true);
    conn.setInstanceFollowRedirects(true);
    // set connection as POST
    conn.setRequestMethod("POST");
    
    conn.setDoOutput(true); // turns it into a post
    
    // setup headers
    conn.setRequestProperty(
    "Content-Type",
    "multipart/form-data; boundary=" + CONTENT_BOUNDARY);
    
    conn.setRequestProperty("Accept-Language", "en-us");
    conn.setRequestProperty("Accept-Encoding", "gzip, deflate");
    
    conn.setRequestProperty("CACHE-CONTROL", "no-cache");
    
    os = conn.getOutputStream();
    
    String request =
    "--"
    + CONTENT_BOUNDARY
    + "\r\n"
    + "Content-Disposition: form-data; name=\"upfile\"\r\n\r\n"
    + file_name
    + "\r\n"
    + "--"
    + CONTENT_BOUNDARY
    + "\r\n"
    + "Content-Disposition: form-data; name=\"upfile\"; filename=" +
    file_name
    + "\r\nContent-Type: multipart/form-data\r\n\r\n"
    + file_data //file is read into a string here, is it OK? But no
    other choose.
    + "\r\n"
    + "--"
    + CONTENT_BOUNDARY
    + "\r\n";
    
    System.out.println("DEBUG: Sending the following request:\n\r" +
    request);
    System.out.println("DEBUG: Sending the post request...\n\r");
    os.flush();
    
    os.write(request.getBytes(), 0, request.getBytes().length);
    os.flush();
    
    in = new BufferedReader(new
    InputStreamReader(conn.getInputStream()));
    String inputLine;
    
    while ((inputLine = in.readLine()) != null) {
    response.append(inputLine);
    }
    
    // closing connections
    in.close();
    in = null;
    os.close();
    os = null;
    conn.disconnect();
    conn = null;
    
    done = true;
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    Let me know if you need more information.
    
    Thanks,
    Amit.
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    works when run from IDE. When I try to load it into a web browser I
    get
    
    java.security.AccessControlException: access denied
    (java.util.PropertyPermission oracle.jserver.version read)
    
    What's up?
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    I want to build a thin java swing client.
    
    How to do it?
    
    tks
    
    Programador
    ----------------------------------
    email***@***.com
- 4
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    have a canvas, what should i do in order to save what's currently on
    it to a file?
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    Is there a way to AUTOMATICALLY check if all mentioned *.jar files really exist?
    
    I could imagine a command (or even java class) which checks this from command line:
    
    java check_cp &CLASSPATH%
    
    or similar
    
    J.
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    from a custom JComponent. At this point I have put an instance of a subclass
    of JComponent in a JScrollPane and placed it in the center of a
    BorderLayout. I then added a mouse listener to the subclass of JComponent,
    traced through the code to make sure I am acutally adding the listener, but
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- 6
  - Filechooser appearanceI am using Netbeans. I need a JFileChooser to pop up in it's own
    window, but i'm not sure how to make this happen. i'm new to java gui
    programming. could someone please point me in the direction of (or
    just provide) a clear-cut example of how to do this, as I can' seem to
    find one?
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  - XML call XSL that calls xml through document() elementHello,
    
    I am trying to create an XML document on the fly that sends some
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    I reference the xsl document:
    
    <?xml version="1.0" encoding="ISO-8859-1"?>
    <?xml-stylesheet type="text/xsl" href="web-primary.xsl"?>
    
    I am just trying to hardcode the request to prove that this is possible
    for the time being so the parameters are already in the xsl that will
    eventually be variables.
    
    but I am unsure what else to include in the first XML file to make the
    call to the web-primary.xsl????? My XSL is complete and the
    corresponding XSL files are complete.
    
    The xsl doc has a document element that calls the correct xml file that
    contains the data.
    
    My reason for doing all of this is because Firefox will not allow me to
    go to a remote xml file from the server so I want the browser to do the
    work of getting the remote xml file. If you have a better way of doing
    this, please let me know.
    
    thx.
- 11
  - Need help creating a program to create sudukoStill a little rough at this language but i need to create a program
    for my class. Was wanting to create a java program that makes sudukos.
    It doesn't need a GUI or anything like that just ouput to a txt file
    ot to the screen. I would appreciate any help or direction.
- 14
  - Novice Form QuestionI am a novice at JSP / HTML and have a Forms releated question. I am
    really looking for sample code I can leverage to help understand how
    to address non-trivial form layouts.
    
    I undestand the how to build a -simple- form with a few input fields
    and process this with JSP - Struts interaction. Unfortunately, I am
    weak in HTML / JavaScript and I need to understand and build a more
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    Basically my form must look something like this:
    
    User Name: _________________ Baggage Type ____________
    
    Add Button | Remove Button Add Button | Remove Button
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    | Dick | | SomeBagType 2 |
    | Harry | | SomeBagType 3 |
    | Jane | | SomeBagType 4 |
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    Note that there are 6 buttons on the form. The Add / Remove buttons
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- 14
  - card shuffling errorI am relatively new to java programming and I am working on a card
    project for school. I had finished and tested every method with error
    in my Deck class. However, in the time it took to pick up dinner it is
    now producing errors. I would greatly appreciate anyone input and help.
    This is the error that is produce when invoking the shuffle method.
    
    java.lang.IndexOutOfBoundsException: Index: 235, Size: 51
    at java.util.ArrayList.RangeCheck(ArrayList.java:546)
    at java.util.ArrayList.get(ArrayList.java:321)
    at Deck.swap(Deck.java:176)
    at Deck.shuffle(Deck.java:129)
    
    public class Deck
    {
    /** The number of cards in a deck */
    public static final int DECK_SIZE = 52;
    /** The number of times to shuffle */
    public static final int TIMES_TO_SHUFFLE = 1000;
    
    private ArrayList deck; // a deck of cards
    
    /**
    * Constructor for objects of class Deck
    */
    public Deck()
    {
    deck = new ArrayList();
    newDeck();
    }
    
    /**
    * Load a new deck with all DECK_SIZE cards
    */
    public void newDeck()
    {
    if (deck.size() > 0){
    deck = null;
    }
    else{
    //Hearts
    deck.add(new Card("Ace","Hearts",11));
    deck.add(new Card("Two","Hearts",2));
    deck.add(new Card("Three","Hearts",3));
    deck.add(new Card("Four","Hearts",4));
    deck.add(new Card("Five","Hearts",5));
    deck.add(new Card("Six","Hearts",6));
    deck.add(new Card("Seven","Hearts",7));
    deck.add(new Card("Eight","Hearts",8));
    deck.add(new Card("Nine","Hearts",9));
    deck.add(new Card("Ten","Hearts",10));
    deck.add(new Card("Jack","Hearts",10));
    deck.add(new Card("Queen","Hearts",10));
    deck.add(new Card("King","Hearts",10));
    
    //Diamonds
    deck.add(new Card("Ace","Diamonds",11));
    deck.add(new Card("Two","Diamonds",2));
    deck.add(new Card("Three","Diamonds",3));
    deck.add(new Card("Four","Diamonds",4));
    deck.add(new Card("Five","Diamonds",5));
    deck.add(new Card("Six","Diamonds",6));
    deck.add(new Card("Seven","Diamonds",7));
    deck.add(new Card("Eight","Diamonds",8));
    deck.add(new Card("Nine","Diamonds",9));
    deck.add(new Card("Ten","Diamonds",10));
    deck.add(new Card("Jack","Diamomds",10));
    deck.add(new Card("Queen","Diamonds",10));
    deck.add(new Card("King","Diamonds",10));
    
    //Spades
    deck.add(new Card("Ace","Spades",11));
    deck.add(new Card("Two","Spades",2));
    deck.add(new Card("Three","Spades",3));
    deck.add(new Card("Four","Spades",4));
    deck.add(new Card("Five","Spades",5));
    deck.add(new Card("Six","Spades",6));
    deck.add(new Card("Seven","Spades",7));
    deck.add(new Card("Eight","Spades",8));
    deck.add(new Card("Nine","Spades",9));
    deck.add(new Card("Ten","Spades",10));
    deck.add(new Card("Jack","Spades",10));
    deck.add(new Card("Queen","Spades",10));
    deck.add(new Card("King","Spades",10));
    
    //Clubs
    deck.add(new Card("Ace","Clubs",11));
    deck.add(new Card("Two","Clubs",2));
    deck.add(new Card("Three","Clubs",3));
    deck.add(new Card("Four","Clubs",4));
    deck.add(new Card("Five","Clubs",5));
    deck.add(new Card("Six","Clubs",6));
    deck.add(new Card("Seven","Clubs",7));
    deck.add(new Card("Eight","Clubs",8));
    deck.add(new Card("Nine","Clubs",9));
    deck.add(new Card("Ten","Clubs",10));
    deck.add(new Card("Jack","Clubs",10));
    deck.add(new Card("Queen","Clubs",10));
    deck.add(new Card("King","Clubs",10));
    }
    }
    /**
    * Add a single card to the deck.
    * @param a Card object
    */
    public void addCard(Card newCard)
    {
    // add a card to the deck
    deck.add(newCard);
    }
    
    /**
    * Shuffle the deck. This involves selecting random pairs of
    * cards and swapping them, the number of times to swap determined
    * by the constant TIMES_TO_SHUFFLE.
    */
    public void shuffle()
    {
    //Zero the deck vector
    deck.removeAllElements();
    
    int index1 ,index2;
    for (int i = 0; i < DECK_SIZE ; i++) {
    index1 = (int)(Math.random()*TIMES_TO_SHUFFLE);
    index2 = (int)(Math.random()*TIMES_TO_SHUFFLE);
    swap (index1, index2);
    }
    }
    
    /**
    * Display the entire contents of the deck. Not used in the
    * game but useful for debugging.
    */
    
    public void showDeck()
    {
    Iterator it = deck.iterator();
    while(it.hasNext()) {
    Card currentCard = (Card) it.next();
    System.out.println(currentCard);
    }
    }
    
    /**
    * Remove the top card from the deck.
    * @return the Card object removed or null if there is nothing in
    the deck.
    */
    public Card takeCard()
    {
    int index = 0;
    if (index >= deckSize()) {
    return null;
    }
    else{
    return (Card) deck.remove(0);
    }
    }
    
    /**
    * Return size of deck
    */
    public int deckSize()
    {
    return deck.size();
    }
    
    /**
    * Card Swap method
    */
    public void swap(int index1, int index2) {
    Card temp = (Card)deck.get(index1);
    deck.set(index1, deck.get(index2));
    deck.set(index2, temp);
    }
    
    /**
    * Methods returns card index and card description - testing
    purpose
    */
    public void displayCardIndex()
    {
    for (int index = 0; index < deckSize(); index++)
    {
    System.out.println("Index: " + index + " Card : " +
    deck.get(index));
    }
    }
    
    }
- 15
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    I'd be gratefull for a push in the right direction.
    
    thanks
    
    sal
    
    ps this is my final year University Computer Science project
    
    for more details on the project
    http://www.mellowmoose.org/project.html
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    --
    Hi Flex

Author

Message

saila

Posted: 2006-4-23 21:39:00

Top

java-programmer, Java server performance - jeety Hi All,

I am working on an application where a servlet need to handle min 600
request / sec(which will keep on increasing in future)
So I am not able to decide which application server I should use.

As I go through some benchmarks I came to know that Jetty's performance
is better but
I don't know how much load it can handle.

Is there any who has used Jetty on heavy traffic application?

or is there any another servlet container / HTTP Server which can
handle such a load

Plz suggest me.

Thanks in Advance.

Rajiv Girdhar

Wibble

Posted: 2006-4-24 1:26:00

Top

java-programmer >> Java server performance - jeety saila wrote:
> Hi All,
>
> I am working on an application where a servlet need to handle min 600
> request / sec(which will keep on increasing in future)
> So I am not able to decide which application server I should use.
>
> As I go through some benchmarks I came to know that Jetty's performance
> is better but
> I don't know how much load it can handle.
>
> Is there any who has used Jetty on heavy traffic application?
>
> or is there any another servlet container / HTTP Server which can
> handle such a load
>
> Plz suggest me.
>
> Thanks in Advance.
>
> Rajiv Girdhar
>
Tomcat seems to do a little better than Jetty but its all good.

http://www.webperformanceinc.com/library/reports/ServletReport/

I think that the servlet engine doesn't make that big a difference,
rather than the clustering and load balancing of the containing
app server. At 600 transactions per second, your database may
also be significant bottleneck. Depending on your database, it
may be alot easier to throw CPU's at the middle tier than the
DB.

Index ‹ java-programmer

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- 15
  - Applet startup error - simple questionGreetings!
    
    I am running into a very strange problem with a very simple code
    
    In my html page I have the following code:
    
    <applet codebase="/" code="InterApplet" width="400" height="150"
    name="InterApplet">
    <param name="OutFrame" value="outFrame" valuetype="object">
    no support for java
    </applet>
    
    When I load the page on Windows 2000 machine running IE6 it works fine
    - applet loads. However, when I try to open this page on a Windows XP
    machine also running IE6 it can't find the applet "load: class
    InterApplet not found". I have my custom built web server so I could
    actually see that the browser did make a request for InterApplet.class
    and web server has served it.
    
    So what in the world is happening?!? This is very frustrating.
    
    I have not done any serious java programming since '97...
    
    Thanks for your time.