java-programmer >>Just upgraded to the newest jdk 1.5

Just upgraded to the newest jdk 1.5

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- 2
  - Using Using EventListenerList for non gui object listeningI have a non gui object that i would like to make available for
    listeners but instead of using collection/list i am using the class
    javax.swing.event.EventListenerList to hold my listeners.
    
    I understand that if it's non gui then i should not involve gui classes.
    However, is this acceptable?
- 3
  - comp.lang.java.{help,programmer} - what they're for (mini-FAQ 2004-10-08)Last-Modified: Fri Oct 8 11:38:42 2004 by David Alex Lamb
    Archive-name: computer-lang/java/help/minifaq
    Posting-Frequency: every 4 days
    
    Before posting read Jon Skeet's "How to get answers on the comp.lang.java.*
    newsgroups" at http://www.pobox.com/~skeet/java/newsgroups.html
    
    Java FAQs and advice:
    - Java FAQ (Andrew Thompson) http://www.physci.org/codes/javafaq.jsp
    including his list of other FAQs http://www.physci.org/codes/javafaq.jsp#faq
    - Java/Javascript/Powerbuilder HOWTO (Real Gagnon)
    http://www.rgagnon.com/howto.html
    - Java Glossary (Roedy Green) http://www.mindprod.com/jgloss.html
    - jGuru jFAQs (John Zukowski) http://www.jguru.com/jguru/faq/
    - Focus on Java (John Zukowski) http://java.about.com/
    - Java Q&A (David Reilly) http://www.davidreilly.com/jcb/faq/
    - Java GUI FAQ (Thomas Weidenfeller) http://www.physci.org/guifaq.jsp
    
    comp.lang.java.help Set-up problems, catch-all first aid.
    According to its charter, this unmoderated group is for immediate help
    on any Java problem, especially when the source of the difficulty is
    hard to pin down in terms of topics treated on other groups.
    This is the appropriate group for end-users, programmers and
    administrators who are having difficulty installing a system capable of
    running Java applets or programs. It is also the right group for
    people trying to check their understanding of something in the
    language, or to troubleshoot something simple.
    
    comp.lang.java.programmer Programming in the Java language.
    An unmoderated group for discussion of Java as a programming language.
    Specific example topics may include:
    o types, classes, interfaces, and other language concepts
    o the syntax and grammar of Java
    o threaded programming in Java - sychronisation, monitors, etc.
    o possible language extensions (as opposed to API extensions).
    The original charter said that discussion explicitly should not include
    API features that are not built into the Java language and gave examples
    like networking and the AWT. These days AWT belongs in clj.gui, and
    networking (and many other APIs) are often discussed in clj.programmer.
    
    Do not post binary classfiles or long source listings on any of these
    groups. Instead, the post should reference a WWW or FTP site (short source
    snippets to demonstrate a particular point or problem are fine). For some
    problems you might consider posting a SSCCE (Short, Self Contained, Correct
    (Compilable), Example); see http://www.physci.org/codes/sscce.jsp
    
    Don't post on topics that have their own groups, such as:
    comp.lang.java.3d The Java 3D API
    comp.lang.java.advocacy Arguments about X versus Y, for various Java X and Y
    comp.lang.java.beans JavaBeans and similar component frameworks
    comp.lang.java.corba Common Object Request Broker Architecture and Java
    comp.lang.java.databases Using databases from Java
    comp.lang.java.gui Java graphical user interface design and construction
    comp.lang.java.machine Java virtual machines, like JVM and KVM
    comp.lang.java.security Using Java securely
    comp.lang.java.softwaretools Tools for developing/maintaining Java programs
    Don't cross-post between these groups and c.l.j.programmer or .help -- it just
    wastes the time of people reading the general groups.
    
    Don't post about JavaScript; it's a different language. See
    comp.lang.javascript instead.
    --
    "Yo' ideas need to be thinked befo' they are say'd" - Ian Lamb, age 3.5
    http://www.cs.queensu.ca/~dalamb/ qucis->cs to reply (it's a long story...)
- 3
  - Web Services Performance problemI am trying to use web services in our project in websphere server, In
    this we are using swing as client to connect the EJB, which is running
    thru web services. we are able to connect EJB and get the response
    from websphere server using web services. The below code is in EJB as
    business method
    
    public Vector getData(){
    Vector v = new Vector();
    for(int i=0;i<20000;i++)
    v.add("String");
    return v;
    }
    I use SOAP RPC encoding and in the client side i use SOAP.jar to
    connect the web service and get the response.
    but it takes around 8 seconds to get the response.
    
    at the same time, i used below code in EJB as business method
    
    public Vector getData(){
    Vector v = new Vector();
    for(int i=0;i<20000;i++)
    v.add(new DataObject("String"));
    return v;
    }
    
    public class DataObject{
    String str = null;
    public DataObject(String data){
    str = data;
    }
    
    public String getData(){
    return str;
    }
    
    public void setData(String data){
    this.data = data;
    }
    
    }
    
    here, i create object for my own DataObject class.
    
    now i connect to this EJB, it takes double the amount of time to get
    the response.
    
    Please help me, Is there any other way to increase the performance of
    web services?
    
    Thanks,
    Raja
- 4
  - Java 1.5 and system fontsHi,
    
    I don't know if this is the right group to ask this (if not, where
    should I post?), but here we go: I have two machines, both running
    Debian, and installed the official Sun JDK (1.5.0_05) on both. Here's
    the question: on one machine, Java applications find all fonts that
    have been installed on the system; on the other, Java applications only
    find a very small set of standard fonts.
    
    Obviously, there must a difference between the two systems (they are
    certainly not identical, although they are pretty similar) -- but I
    can't think what it could be. It is certainly not a configuration in
    the JDK itself, because the two installations on both machines are
    identical (I even diff-ed both directories to be sure :-) What I don't
    know is how to make fonts available to the JVM - or, what I have done
    wrong/correct on either machine. I know the fonts have been installed,
    because running Gimp (for instance) on either machine finds all the
    fonts. The fontconfig configuration in /etc/fonts is also identifical
    as far as I can see (I don't know if that has anything to do with
    anything, but I checked anyway :) Also, both systems are running defoma
    (the Debian font manager), but I don't know if that can help in any way
    here.
    
    Any pointers or hints would be appreciated,
    
    Thanks,
    
    Edsko
- 7
  - question about DES APIHello All,
    
    The following is the code I wrote to do DES encryption.
    public byte[] run ()throws Exception
    {
    // TODO Auto-generated method stub
    byte[] re = null;
    byte[]re1 = null;
    if (key.length != 8){
    throw new DesException("Invalid Key!!!");
    }
    KeyGenerator kg = KeyGenerator.getInstance("DES");
    SecretKey sk = kg.generateKey();
    SecretKeySpec desKey = new SecretKeySpec(key, "DES");
    Cipher des = Cipher.getInstance("DES");
    if ((comm == Cipher.DECRYPT_MODE) && (data.length != 8)){
    throw new DesException("Invalid Key!!!");
    }
    des.init(Cipher.ENCRYPT_MODE, desKey);
    int l = des.getOutputSize(8);
    re = des.doFinal(data);
    
    des.init(Cipher.DECRYPT_MODE, desKey);
    l = des.getOutputSize(16);
    re1 = des.doFinal(re);
    return re;
    }
    
    I don't understand why I try entrypt 8 bytes data, the the length of
    return value is 16 bytes, the first 8 bytes are what I want, what are
    last 8 bytes? as far as I know, for des, the input block is 8 bytes,
    output block is 8 bytes too. I use this return value to decrypt, I got
    correct value.
    
    If I just input first 8bytes to decrypt I got exception.
    
    Anyone can explain this to me or recommend any detail document about
    these API?
    
    Thanks a lot.
- 7
  - Java ArchitectDoes this forum have an experienced Java Architect? I would like to
    bounce a few questions to someone with some industry experience. I am
    the project manager for a new software app. I would like some advice on
    java architecture and technologies. Appreciate this is all high-level,
    but if certain technologies jump out to you then please let me know.
    
    Scenario: Message brokering of news items over a LAN
    
    User view is a java applet or could be java enabled web page (some kind
    of smart console running on their PC desktop)
    
    For now the application will have 50 users all on the same internal
    network.
    
    Central Oracle/SQL Server Repository - holding messages.
    
    All clients communicate with central database that holds messages and
    configuration information.
    
    Based on the config. found each java client will dynamically build drag
    and drop lists/trees of this information.
    
    Ability to screen capture based on a user selection and upload the
    image to a DB repository
    
    Each client will be able to post new messages to the server which will
    need to alert the other clients.
    
    An author of a message can see if messages have been read by the
    consumers. If the user has not read the author can send a warning to
    that particular user.
    
    Licensing needs to be built in to restrict to 50 concurrent users.
    
    Security login screens are required. Use central db server to
    authenticate.
    
    Scenario2: This is where it gets interesting. How would this change in
    a WAN scenario? - Could this even work using zero front print java?
    
    Also if you live in/near London then please let me know.
    Andy
- 10
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- 10
  - load JNI from resource file?I am able to write a C native interface and load it using the
    System.loadLibrary() routine.
    
    Is there anyway to store the native interface library (say
    "hello.dll") into a jar and then load the file from the jar?
- 10
  - Eclipse IDE Javadoc TooltipsHi:
    
    I'm using the Eclipse IDE for Java development, but am running into
    some problems with the "Content\Code Assist" feature. Normally, when I
    partially enter the name of a particular class of package, the IDE
    automatically displays possible completions based on that string of
    text. However, the IDE is also supposed to show me the associated
    Javadoc for that class.
    
    I know that this feature is enabled because it is able to show me the
    associated Javadocs for any classes that I write myself and reside in
    the current project.
    
    I have set the Javadoc location for that project to the following
    directory (gotten after unzipping the documentation download file):
    
    file:/E:/Java API/docs/api/
    
    However, it does not show any Javadocs for the other classes that are
    in the Java API.
    
    Can anyone help out?
    
    Thanks,
    - ADH
- 12
  - Quick questionI am not sure if this is the group i should post this question so
    maybe you can point me in the right direction.
    
    I have a computer and when I install the java runtime environment it
    installs but when i try to access a page that uses java the screen
    freezes and some times turnes scrambles with blue colors. I have
    never seen anything like this. The OS works fine otherwise. I have
    tryed to uninstall and reinstall. The web site I go to needs it and
    if you don't have it installed it begins an installation for you.
    Thanks for any help you can give me
    Ben Dunning
- 15
  - Converting byte array to stringHi,
    I am trying to convert a byte array to a string. I am using the
    possible ways
    but not getting the result.
    
    DatagramPacket dgram = new DatagramPacket(buf, buf.length);
    ByteArrayInputStream byteIn = new ByteArrayInputStream (dgram.getData
    (), 0, dgram.getLength ());
    
    ObjectInputStream oin = new ObjectInputStream(byteIn);
    Object obj = oin.readObject();
    String recvString = obj.toString();
    DataInputStream dataIn = new DataInputStream (byteIn);
    String recvString = dataIn.readLine();
    
    String recvString = new String(dgram.getData(),0,dgram.getLength());
    String recvString = dataIn.readLine();
    
    I am trying all these to convert my byte array to a string
    But I am getting exception as invalid header.
    
    Can anybody please suggest me.
    
    Regards,
    Hari.
- 15
  - Execute JSP within a servlet ?Hi folks,
    
    A bug in cocoon prevents me from using it with JSP ... so I decided to
    do my own implementation. I want to load up and execute a JSP file from
    within a servlet, and from the generated XML doc apply an XSL style
    sheet, then send back HTML to the browser. This is doable right ? since
    a jsp doc somehow gets compiled and executed within a servlet anyway
    ... Is there an example of how this can be done ?
    Also, am I going to miss out on some possible caching that happens
    magically when I invoke a jsp directly from the browser ?
    
    Many thanks,
    
    galpi
- 15
  - Java help websiteI am very new for Java programming, and I am looking for some Java help
    website with a lot of examples and explan, anyone can help
- 15
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    us at any time.
    
    visit http://www.real-article.com/java/index.php
- 15
  - Screen Fonts in SwingHello everybody;
    
    Is there a way to access screen fonts (Fixedsys, Courier, Terminal ...)
    on a windows machine using java swing. I tried the following. . .
    
    GriphicsEnvironment.getAvailableFontFamilyNames()
    
    but it does not return screen font names. I also tried
    
    Font fn=new Font("Courier",Font.PLAIN,10)
    
    But it returns 'Courier New' font instead of 'Courier'.

Author

Message

Christian Laursen

Posted: 2005-3-26 18:54:00

Top

java-programmer, Just upgraded to the newest jdk 1.5 I just upgraded my jdk 1.5 to the newest version in ports after I saw a
commit fixing a performance issue.

My swing application now behaves very well without being sluggish at all
and looks much nicer than with jdk 1.4.

Thank you very much for your great work on this.

--
Christian Laursen

Index ‹ java-programmer

Next
- 1
  - How about to lauch a new thread in a constructor?I read one piece of code written by somebody and behold interesting
    class as below:
    
    class SomeFramework {
    public SomeFramework() {
    ...
    DameonThread dameon = new DameonThread();
    dameon.start();
    }
    
    private doSomething() {
    ...
    }
    
    private class DameonThread extends Thread {
    public void run() {
    ...
    doSomething();
    ...
    }
    }
    }
    
    As you can see, in the constructor of SomeFramework, one thread is
    launched and that thread will call the SomeFramework instance's private
    method. Perhaps the author design this code to make the client code
    easy. The client just call "new SomeFramework()" and everything is done.
    No need to coding like
    SomeFramwork framework = new SomeFramework();
    framework.lauch();
    
    However, the problem is that it is possible that when the dameon is
    started, CPU will go into run and call doSomething() of the instance of
    SomeFramework. But, at that time, the constructor is not returned. Is it
    reasonable to call a method of a un-instanstized object? Curiously, this
    code works well all the time. Luckily, before dameon is started, all
    member variables are instantized in constructor, but I really think this
    code is ugly and should be avoided.
- 2
  - metadata and stored proceduresHi everybody,
    
    I use a CallableStatement to run my stored procedure, and I would like
    to retrive the columns name of the result.
    So I try to use the getMetaData method of my CallableStatement, but it
    returns me null futhermore than le callablestatement returns data.
    How can I do to retrieve my columns names ?
    Thanks
    
    Thomas
- 3
  - crash during file writing, how to recover ?Hi
    I'm writing a commercial program which must be reliable. It has to do
    some basic reading and writing to and from files on the hard disk,
    and also to a floppy.
    
    I have foreseen a potential problem. The program may crash
    unexpectedly while writing to the file. If so, my program should
    detect this during startup, and then (during startup) probably delete the
    data added to the file and redo the writing operation.
    
    Are file writing operations atomic ? ie when you write to a file,
    will it either do it succesfully, OR say half fail (eg write a few letters
    and not finish), OR not commit any changes to the file if a crash at
    this point occurs?
    
    My next question is how is this handled in commercial programming? I
    plan on writing a flag (say, a simple char) to another file (this
    would signal that a file write is about to begin), and then
    removing this char after the file writing operation is completed.
    Then on startup i just check the flags. if flag hasn't been removed a
    crash occurred, so have to open file and get rid of any garbage.
    
    Has anyone done anything similar b4? if so how did you handle this
    crash scenario. My application could totally stuff up if i don't
    handle this right.
    
    by the way, i'm using the java language and api. this might effect
    how files are written to, so i thought i should mention this.
    
    MANY THANKS
    Joseph
- 4
  - why not Java?
    The company I am working for hired a guy three months ago which is a strong M$
    fan, and I am a Java fan and also a SCJP, but somehow he and my ex-boss deceide
    we should have a standard language for future projects (we are using VB6
    currently), so he said we all should using VB.Net/ASP.Net now, and he said I
    should forget what I know about Java/JSP. When I said "Since VB.Net/ASP.Net are
    both new to us, why cannot we give Java a chance?", but he said ".Net is the
    future." and from his eyes, he seems want to say "you are fired if you do not
    want move to .Net."
    
    Should I find a new Java job?
- 5
  - Interfaces vs. Abstract.Greetings,
    
    I have googled around a bit about this one and consulted my various Java
    tomes on the differences between abstract classes and interfaces.
    
    They seem to be similar ideas *_BUT_* interfaces have no method code (i.e.
    only abstract methods), just signatures and final static identifiers.
    Abstract classes can have method code as well a abstract methods, constants
    and non-constants.
    
    It is possible for a class to implement multiple interfaces (in C++ talk
    inherit from multiple abstract base classes) but a class can only extend
    one other class (again in C++ese inherit from one class).
    
    Is this understanding correct?
    
    What general guidelines do you use to determine when to use an interface vs.
    abstract classes?
    
    For example I am working on creating a ReportWriter. I want the ReportWriter
    to be able to write out in PostScript, text, and in HTML. I am thinking
    about using an interface.
    
    All three need to create headers, footers, and write detail lines. However,
    the details of each operation are completely different from the other.
    
    Thanks
    
    --
    From: Mark A Framness <email***@***.com>
    http: http://netnet.net/~farmer/index.html
    
    With all of thy getting, get understanding!
    Proverbs 4:7
- 6
  - Set Txd always UPHello,
    
    I use Java Comm, and i would like to know if i can use Txd (or td)
    like RTS or DTR with Java Comm and how could I do this?
    
    sample setTxd( true) and Txd=12v
    setTxd( false) and Txd=-12v
- 7
  - native jdk release schedule questionHi folks,
    
    I am trying to find any information regarding the release schedules of
    native java1.4 in binary form. As far as I understand the license allows for
    a binary distribution. On the freebsd site latest news regarding java is
    from December 2003. How do things look like? Or my question makes no sense
    at all?
    
    Cheers, Dani
    
    _______________________________________________
    email***@***.com mailing list
    http://lists.freebsd.org/mailman/listinfo/freebsd-java
    To unsubscribe, send any mail to "email***@***.com"
- 8
  - executing a jsp from a java applicationI have a jsp that checks which clients that are connected. This works
    well! When I from a browser loads the jsp page, information about how
    many clients is connected is presented in the browser and also
    appended to a logfile on the Windows 2003 server machine.
    
    Now I want to write a Java application that is to always be running on
    the server. In this Java application there is a timer that expires,
    lets say every 10 minutes. When the timer expires a certain method
    (lets call it timerEventHandler) in the java application executes.
    
    Question:
    
    How can timerEventHandler execute the jsp so that information about
    connected clients is appended to the logfile at every 10 minute?
    
    I would really like som code for this. I have searched the Internet
    for a couple of days now. I tried using JEditorPane and construct a
    minimal webbrowser that would load the jsp page, but after trying
    several examples of java webbrowsers it seems that I am behind proxys,
    firewalls, or whatever that makes it impossible for me to load a
    webpage. I can however start IE and load the page. Does anyone have an
    idea what can be done?
    
    thanks
- 9
  - Memory utilizationI was trying to profile the following piece of code using NetBeans:
    
    public static void main(String[] args)
    {
    Map<String, String> map = new HashMap<String, String>();
    for( int i = 0; i < Integer.MAX_VALUE; ++i )
    {
    map.put(Integer.valueOf(i).toString(),
    Integer.valueOf(i).toString());
    }
    }
    
    I set my max and min heap size to be 1GB. I find that the program dies
    after having created 4M entries (at which point the heap used is at
    1GB) although the memory used by the objects as indicated by the
    Netbeans memory profiler is the following:
    
    String -- 48MB
    char[] -- 48 MB
    HeapCharBuffer -- 45MB
    Integer -- 19MB
    HashMap$Entry -- 19MB
    
    This totals to less than 200 MB and the rest of the objects are at 0%
    of the total used memory at most another 200MB. How come the heap
    usage is at 1GB at this point of time? I am extremely confused. Could
    someone please explain what might be going on?
    
    Thanks
    A
- 10
  - No window control in an Application WindowHi,
    
    After following a JFACE eclipse example, i created a new class that
    extends ApplicationWindow that create a nice window with tool bar, menu
    bar and status bar. That's great.... but my window doesn't have window
    controls to minimize or iconify it, only the quit element (the cross)!
    Does anybody know which attribute i have to set to have window
    controls?
    
    Thx
    
    0o.
- 11
  - Data entry applicationHi,
    I am an intermediate computer science student and I am in need of a "macro
    type" tool/language that will let me automate a data entry process. The
    data entry is rather simple but requires connecting to a server in between
    data inputs, which ends up taking a lot of time per entry (about 10 minutes
    per complete entry). On average, there are 50 - 100 entries to be made (10
    min * 50 entries = one hell of a boring day.) The data that is to be
    entered is in Excel, and then I (or some other unlucky person) must enter
    the data manually into a prompt/DOS-like program run in the Windows (2000)
    environment.
    
    Would you know of anything that could help? Is there a way to do something
    like this with any language? What would be required to setup the automation
    (in the Windows environment)? I am pondering if a simple Windows
    application that replicates key-strokes and has a timer capability would do
    the trick (although I doubt it would be able to read the spreadsheets)?
    
    Please let me know if you have any suggestions or comments. My thanks in
    advance for any help.
    
    email***@***.com
- 12
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    This also occurs in some other Java applications I downloaded and
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    I am not sure why this happens. But what I do know is that some laptop
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    Not sure if anyone can give any input to what might be causing this --
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- 13
  - Serialize Applet to a web server via Servlet ProblemHi,
    
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    There is 2050 bytes in byte array on my applet before sending it, and
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    Where is my mistake ?
    Regards
    Philippe
    
    Applet
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    {
    ObjectOutputStream out;
    System.out.println("Debut Test WRITE APPLET...");
    
    //Serialisation de la frame
    try
    {
    String m_URL=new
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    String string4=m_URL;
    System.out.println("w01 "+string4);
    
    URL u=new URL(string4);
    
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    ObjectOutputStream oos = new ObjectOutputStream(baos);
    oos.writeObject(this);
    oos.flush();
    oos.close();
    byte b[] = baos.toByteArray();
    
    HttpURLConnection urlc = (java.net.HttpURLConnection)
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    urlc.setDoInput(true);
    urlc.setUseCaches(false);
    urlc.setAllowUserInteraction(false);
    
    urlc.setRequestProperty("Content-Type",
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    String lengthString = String.valueOf(baos.size());
    urlc.setRequestProperty("Content-Length", lengthString);
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    out = new ObjectOutputStream(urlc.getOutputStream());
    out.write(b);
    
    if (urlc.getResponseCode() != HttpURLConnection.HTTP_OK) {
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    out.flush();
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    -------------------------------------------------------------------------
    
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    public void doPost(HttpServletRequest req, HttpServletResponse resp)
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    InputStream in = req.getInputStream();
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    f.close();
    
    if(debug) System.out.println("XXServlet write04 ");
    
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- 14
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    Im currently hosted with godaddy, but I think I need to jump away from
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    http://www.adsinmedia.com/JSP-Servelets-Hosting-India.html
    http://www.visionwebhosting.net/
    http://www.belahost.com/pp/index.php
    
    thanks for any feedback!
- 15
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