java-programmer >>Printing using CUPS in Linux and Java 1.5

Printing using CUPS in Linux and Java 1.5

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- 1
  - Referencing enclosing class from inner classHi everyone,
    I'm trying to understand inner classes, but came across the following
    problem. If I define two types (one is an inner class), and each type
    has a method with the same name, is there a way that I can call the
    enclosing instance's method from within an instance of the inner class?
    I'm guessing that (as per the example pasted below) the getValue()
    methods aren't overloaded or overridden because the two classes don't
    participate in super-class/sub-class OO relationship. I'd be grateful
    for any insight.
    Thanks,
    Jonathan
    
    public class EnclosingClass {
    
    private int _value = 100;
    
    private class InnerClass
    {
    public int getValue()
    {
    return _value * 2;
    }
    
    public void println()
    {
    System.out.println(getValue()); //<-- inner
    System.out.println(getText()); //<-- enclosing
    }
    }
    
    public int getValue()
    {
    return _value;
    }
    
    public String getText()
    {
    return "hello!";
    }
    
    public static void main(String[] args)
    {
    // create an instance of both classes and call the println method of
    the inner class
    new EnclosingClass().new InnerClass().println();
    }
    
    }
- 1
  - how to add double key listenerhi,
    i want to catch the key event when SHIFT+TAB are pressed simultaneously
    to shift focus to the previous focusable component. the key event is
    caught on a JComboBox. if somebody knows the code to do so plz post it.
    thanx in advance.
- 2
  - coordinating eventsHi there,
    
    I'm having difficulty trying to coordinate the sequence of events for
    populating a JTree with data received from a server app. I'm so-o-o-o close
    and yet no banana! It's proving to be very tricky processing. I could use
    some help in trying to make this work properly. Perhaps you may understand
    better as to why my efforts are being thwarted by the either the JTree
    object or its DefaultTreeModel?
    
    Here's the setup:
    
    1) I have a server app that, when requested from the client app, will
    provide a child count on any given directory node on the server. Also, it
    will serve up the names of each child node for any given node upon request.
    
    2) The client app contains a JTree object that I'm trying to initially
    populate with the root node. Subsequently, the plan is to dynamically
    populate any directory node in the JTree whenever the treeWillExpand( ... )
    event is triggered as the user tries to expand on a node.
    
    3) Throughout my code I have a number of System.out.println( ... )
    statements so that I can see what sequence of events are taking place as the
    client app makes requests to the server and receives replies back from the
    server. Also, some println(...) statements in some key methods which you'll
    see.
    
    4) The sequence of events is supposed to go like so:
    
    i) root node is created
    ii) as the root node is passed as a parameter when creating the JTree
    object
    the getChildCount( ) method of the root node [type DefaultTreeNode
    extends DefaultMutableTreeNode ]
    is called.
    
    public int getChildCount()
    {
    if (!hasChildren)
    {
    defineChildNodes();
    }
    return(super.getChildCount());
    }
    
    iii) Since the root node initially has no children, getChildCount( )
    then calls the method
    defineChildNodes( ).
    
    protected void defineChildNodes()
    {
    hasChildren = true;
    ref.requestChildCountFromServer(this);
    }
    
    As you can see, defineChildNodes( ) simply sets the flag
    hasChildren to true then
    calls a method requestChildCountFromServer(this) which exists in a
    class called Response
    referred here by the variable "ref". Also in the Response class
    there exists the method
    populateTree( ) which initially created the root node and JTree
    objects:
    
    protected void populateTree(String NodeName)
    {
    //System.out.println("Entering populatTree() method");
    //This could take a while, so change the cursor icon
    //ref.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
    try
    {
    String separator = "";
    if(ref.serverOS.equals("Windows"))
    separator = "\\";
    else
    separator = "/";
    rootNode = new DefaultTreeNode(NodeName, true, separator);
    expandingNode = rootNode;
    String rootPath = getLeadingPath(ref.rootPath);
    rootNode.setLeadingPath(rootPath);
    rootNode.setResponseReference(this);
    jTree1 = new JTree(rootNode);
    jTree1.setRootVisible(true);
    jTree1.setShowsRootHandles(true);
    jTree1.collapseRow(0);
    MouseListener popupListener = new PopupListener(ref);
    jTree1.addMouseListener(popupListener);
    
    //Listen to our own expand/collapse events to keep the labels in
    sync
    jTree1.addTreeWillExpandListener(this);
    
    }
    catch(Exception e){System.out.println("Exception in populateTree()
    method"); e.printStackTrace();return;}
    ....
    ....
    }
    
    iv) The requestChildCountFromServer( ) method then makes a request to
    the server app for
    the child count for the root node.
    
    v) I have a separate thread running that listens for all responses
    from the server
    called ResponseListener. In its run( ) method I have the
    following code:
    
    else if(connected == ref.ref.SENDING_CHILDCOUNT)
    {
    System.out.println("Received message: ReceivingChildCount");
    ref.expandingNode.numChildren = input.readInt();
    //expandingNode.setReceivedChildCount(true);
    ref.ref.imageLabel.setIcon(ref.ref.blank);
    ref.ref.textLabel.setText("");
    }
    
    When the root node was originally created I set a reference to it
    using a variable
    named expandingNode. Here you can see that the root node's
    instance variable
    named numChildren is set to a value read in by the DataInputStream
    object
    named input.
    
    vi) The requestChildCountFromServer( ) method in turn calls another
    method in the
    Response class named RequestChildrenFromServer(String path).
    RequestChildrenFromServer(String path) method requests from the
    server the names
    of all the child nodes for the root node.
    
    vii) ResponseListener then receives a response from the server:
    
    else if(connected == ref.ref.SENDING_TREE_DATA)
    {
    System.out.println("Received message: SendingTreeData");
    ref.expandingNode.TreeDataIncoming = true;
    ref.expandingNode.ReceiveChildrenFromServer(input);
    ref.ref.imageLabel.setIcon(ref.ref.blank);
    ref.ref.textLabel.setText("");
    }
    
    Here you can see that the root nodes method named
    ReceiveChildrenFromServer(input) is then called
    while passing it a reference to the DataInputStream so that the
    method can
    read in the names of the child nodes as they come in over the
    wire.
    
    viii) The root node's method ReceiveChildrenFromServer(input) then
    begins receiving the
    names of each child node, creates a new DefaultTreeNode object
    for each child node
    and adds it to the root node, seen below:
    
    protected void ReceiveChildrenFromServer(DataInputStream input)
    {
    System.out.println("Entering ReceiveChildrenFromServer()");
    
    DefaultTreeNode child = null;
    String name = "";
    try
    {
    
    //ref.ref.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
    //System.out.println("numChildren = " + numChildren);
    int nodeType = 0;//default
    //iterate through each of the children as they come in
    //from the server.
    for(int i = 0; i < numChildren; i++)
    {
    name = input.readUTF(); //get the name
    System.out.println("child node: " + name);
    child = new DefaultTreeNode(name); //create a new
    child node
    
    //determine if this node is a directory
    //or a file. Empty directories are denoted
    //as having (nodeType == -1)
    nodeType = input.readInt();
    //System.out.println("node type: " + nodeType);
    if(nodeType == 0)
    {
    //Since a file is a leaf node
    //we won't be needing to continue
    //reading in nodes for it.
    child.setResponseReference(ref);
    child.setAllowsChildren(false);
    child.setHasChildren(false);
    child.setLeadingPath(getWholeServerPath());
    if(ref.ref.serverOS.equals("Windows"))
    child.setSeparator("\\");
    else
    child.setSeparator("/");
    }
    else if(nodeType == -1)
    {
    child.setResponseReference(ref);
    child.setAllowsChildren(true); //It's an empty
    directory
    child.setHasChildren(false);
    child.setLeadingPath(getWholeServerPath());
    if(ref.ref.serverOS.equals("Windows"))
    child.setSeparator("\\");
    else
    child.setSeparator("/");
    
    }
    else
    {
    child.setResponseReference(ref);
    child.setAllowsChildren(true); //It's a directory
    with child nodes
    child.setHasChildren(true);
    child.setLeadingPath(getWholeServerPath());
    if(ref.ref.serverOS.equals("Windows"))
    child.setSeparator("\\");
    else
    child.setSeparator("/");
    }
    
    this.insert(child,i);
    }//end for loop
    
    //ref.ref.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
    }//end try
    catch(IOException ioe){ioe.printStackTrace();}
    catch(NullPointerException npe){npe.printStackTrace();}
    }//end method
    
    IT IS HERE THAT I RUN INTO PROBLEMS!!!!
    
    All the code you see compiles fine. What I found annoying is that, at
    run-time, the sequence of events were as I depict them here until I start
    reading in the names of the childnodes with the
    ReceiveChildrenFromServer(...) method. While it is going through its for
    loop, mysteriously the method getChildCount( ) is called again, which in
    turn calls defineChildNodes( ), which in turn calls
    requestChildCountFromServer(...), which interrupts the processing of the for
    loop in ReceiveChildrenFromServer(...) . Here is the read out from the
    console to prove it:
    
    ***************************************
    Entering requestChildCountFromServer
    waiting for response...
    checking...
    Received message: ReceivingChildCount
    checking...
    got ChildCount: 26 <<<Root node has 26 child nodes
    Entering RequestChildrenFromServer()
    path is: C:\JavaProjects
    Finished calling server for children
    Received message: SendingTreeData
    Entering ReceiveChildrenFromServer()
    checking for tree data ...
    child node: AssignmentServer <<<<ReceiveChildrenFromServer(...)
    method begins reading in names
    child node: AssignmentSubmitter
    child node: Borland
    child node: ClientServerJTreeProject
    child node: DBJavaBean
    child node: DirAdmin.bak
    Entering requestChildCountFromServer <<<This method is called by
    defineChildNodes( ) which was
    
    called by getChildCount( )
    waiting for response...
    checking...
    checking...
    Node Expanding.
    checking...
    checking...
    got ChildCount: 0 <<< Don't know
    why this is reading zero. It should be 26
    child node: DirectoryAdministratorProject <<<For loop from
    ReceiveChildrenFromServer(...) method
    
    resumes reading in names
    child node: EZSmtp
    child node: Icon Editor
    child node: images
    child node: IniFileProject
    child node: J2exe
    child node: JCalculator
    child node: JGridProject
    child node: JSlideShow
    child node: MSSTextEditorProject
    child node: MySQL_JDBC
    child node: PersonalNetSearchProject
    child node: Print_Preview
    child node: PropertiesFileAccessExample
    child node: Sample_EBusiness
    child node: SharewareProject
    child node: SystemTreeProject
    child node: TestProgram
    child node: Thread_Pooling
    child node: ZeroG
    Received message: ReceivingChildCount
    *****************************************
    
    Ultimately, I wind up with a root node being displayed in the JTree that
    only has maybe five or six child nodes displayed when there should be 26
    child nodes.
    
    For further clarity here are the methods requestChildCountFromServer(...)
    and RequestChildrenFromServer(...):
    
    public void requestChildCountFromServer(DefaultTreeNode node)
    {
    
    System.out.println("Entering requestChildCountFromServer");
    String name = "";
    try
    {
    //ref.ref.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
    
    output.writeInt(ref.PATH);
    output.flush();
    output.writeUTF(node.getWholeServerPath());
    output.flush();
    output.writeInt(ref.REQUEST_CHILD_COUNT);
    output.flush();
    System.out.println("waiting for response...");
    timer1 = new ChildCountTimer(node);
    timer1.start();
    timer1.join();
    System.out.println("got ChildCount: " + node.numChildren);
    if(node.numChildren > 0)
    {
    //NodeExpanding = false; //reset
    RequestChildrenFromServer(node.getWholeServerPath());
    //Set up TreeDataTimer so that we know we have a
    //response from the server.
    timer2 = new TreeDataTimer(node);
    timer2.start();
    timer2.join();
    }
    
    //ref.ref.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
    }
    catch(InterruptedException ie){}
    catch(IOException ioe){ioe.printStackTrace();}
    catch(NullPointerException npe){npe.printStackTrace();}
    }
    
    protected void RequestChildrenFromServer(String path)
    {
    System.out.println("Entering RequestChildrenFromServer()");
    
    //Request Children from server
    try
    {
    //ref.ref.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
    output.writeInt(ref.PATH);
    output.flush();
    System.out.println("path is: " + path);
    output.writeUTF(path);
    output.flush();
    //Sending REQUEST_CHILDREN should cause a response
    //from the server: SENDING_TREE_DATA
    output.writeInt(ref.REQUEST_CHILDREN);
    output.flush();
    
    //ref.ref.setCursor(Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR));
    
    }
    catch(IOException ioe){ioe.printStackTrace();}
    System.out.println("Finished calling server for children");
    }
    
    I realize this post is rather lengthy, however, I didn't know how else to
    explain my dilemma with this project. If you need more information, just
    ask.
    
    Please advise,
    
    Alan
- 5
  - javadoc -linkoffline helpHowdy All!
    
    I am trying to issue a javadoc command with the following linkoffline
    option:
    -linkoffline http://java.sun.com/j2se/1.4.1/docs/api
    C:/java/j2sdk1.4.1_01/docs/api
    
    Both the file path and the url are valid, but I find the generated
    links are of the form:
    
    file:///E:/phd/semiInterface/doc/http://java.sun.com/j2se/1.4.1/docs/api/java/lang/reflect/Method.html
    
    Can anyone advise how I can make this work?
    
    Thanks for any help!
    
    Rob
    :)
- 5
  - Zip file directory creation problemWhile extracting zip files I've come accross a strange error. I use the
    code below to check if the directory exists and create it if necessary. The
    problem is that it works for most zip files but I have a few zip files that
    do not properly extract using this code.
    
    What seems to be happening is the variable e is referencing a ZipEntry that
    is a directory but it is not being recognized as a directory in the code.
    
    So I get the following debug info printed:
    Extracting AuthorizedDBProject.zip to: D:\zips\AuthorizedDBProject
    D:\zips\AuthorizedDBProject\AuthorizedDBProject\AuthorizedDBProject.jpx (The
    system cannot find the path specified)
    
    The ZipEntry is: AuthorizedDBProject/AuthorizedDBProject.jpx but
    AuthorizedDBProject is not being created before extracting
    AuthorizedDBProject.jpx.
    
    Any pointers, suggestions will be appreciated.
    
    Code:
    ________________
    
    //location - a base directory to extract all the files
    
    try {
    in = new BufferedInputStream ( new FileInputStream ( _file ) );
    zin = new ZipInputStream ( in );
    ZipEntry e;
    while ( ( e = zin.getNextEntry () ) != null ) {
    File entryPath = new File ( location.toString () + File.separator +
    e.getName ());
    
    if ( e.isDirectory () ) {
    if ( !entryPath.exists()) {
    if(entryPath.mkdir()){
    System.out.println (entryPath + " does not exist,
    creating..." );
    }else{
    System.out.println (entryPath + " does not exist and there was
    a problem creating it!!!" );
    }
    }
    continue;
    }
    
    System.out.println(e.getName() + " is NOT a directory");
    System.out.println ( "Extracting: " + e.getName() + " to " +
    entryPath );
    out = new FileOutputStream ( entryPath );
    byte[] b = new byte[ 512 ];
    int len = 0;
    while ( ( len = zin.read ( b ) ) != -1 ) {
    out.write ( b , 0 , len );
    }
    out.close ();
    
    }
    extracted = true;
    } catch ( FileNotFoundException ex ) {
    System.out.println ( ex.getMessage () );
    } catch ( IOException io ) {
    System.out.println ( io.getMessage () );
    } finally {
    if ( out != null ) {
    try {
    out.close ();
    } catch ( IOException ex1 ) {
    System.out.println ( ex1.getMessage () );
    }
    }
    ...
    
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- 5
  - difference between endorsed and lib folders?hi..
    
    can somone please explain to me what is the difference between the
    endorsed and lib folders in common folder in tomcat? i tried reading
    the documentation but i couldn't figure it out.
- 5
  - Error Installing Jboss ServerHi,
    
    I am trying to install Jboss application server on linux. When I ran sh
    run.sh from Jboss Bin Directory, It gave me the following
    messages/Errors.
    
    JBoss Bootstrap Environment
    
    JBOSS_HOME: /home/cabig/jboss-4.0.2
    
    JAVA: /usr/java/j2sdk1.4.2_11/bin/java
    
    JAVA_OPTS: -server -Xms128m -Xmx128m -Dprogram.name=run.sh
    
    CLASSPATH:
    /home/cabig/jboss-4.0.2/bin/run.jar:/usr/java/j2sdk1.4.2_11/lib/tools.jar
    
    =========================================================================
    
    Failed to boot JBoss:
    java.lang.ClassNotFoundException: org.jboss.system.server.ServerImpl
    at java.net.URLClassLoader$1.run(URLClassLoader.java:199)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
    at
    org.jboss.system.server.ServerLoader.createServer(ServerLoader.java:271)
    at
    org.jboss.system.server.ServerLoader.load(ServerLoader.java:253)
    at org.jboss.Main.boot(Main.java:187)
    at org.jboss.Main$1.run(Main.java:463)
    at java.lang.Thread.run(Thread.java:534)
    
    Kindly let me know what the error is ? How to solve this ?
    
    Appreciate your Help,
    
    Thanks
    shan
- 7
  - Certification is a must in MNCs,the comming Future.Certification is a mark of excellence that you carry with you
    everywhere you go.
    
    Integer is a authorised testing center for .Net, Java, J2EE, Testing
    etc..... for the clients like Microsoft, Sun, IBM, Exin, Lotus and
    many more...
    
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    and many more...
    
    For more details Visit: http://www.integerblr.com
    For Registration: http://www.integerblr.com/registration/thomsonprometric.asp
    
    Regards
    Ramesh
- 8
  - redirect problemHi everyone,
    
    I have a problem, I am connectin to a lotus notes database to download
    a file (using URLConnection)
    
    ...gbp.nsf/agWebLAL?OpenAgent&UNID=A9D19EDE65447DF5C1256F2000465E87
    
    The thing is lotus notes doesn't give the filename, it redirects me to
    something first, then downloads the filename..
    
    Does anyone know of a way on how I can get the final url (the place
    where I am being redirected), filename and mimetype
    
    Thanks!
- 10
  - JSTL & Source Code
    
    JavaScript and CSS programmers have for years, been looking for the
    "holy grail", i.e., the ability to hide source code.
    
    Take at look at www.dice.com, do a job search then view source.....
    nothing there except JSTL noatation per below:
    
    -------------------------- start -------------------------------------
    
    
    
    
    
    
    
    ------------------------ end -----------------------------------------
    
    Was not aware that a fringe benefit of JSTL was the ability to hide
    html source code. How secure is this? Can someone hack it to get the
    html source?
    
    I'm one of those Java/JavaScript/CSS programmers that has created
    graphics with CSS on Web pages and would like to keep the code
    private. I have found a crude way but I like the above better.
    
    Thanks
- 12
  - casting from int to byte problemit looks like I have a strange problem.
    I have a small class with several byte 'properties'
    
    and I put a values into them from int values casting them to byte..
    but for some values (like 143), casting result (with (byte)) is -113???
    it's the same with 147 casted to -109...
    and it should be a byte value (means, there should be no negative values)..
    
    value is lowered for 256
    why?
    
    did I missed something?
- 13
  - [ANNOUNCE] DataDirect Technologies Releases DataDirect XQuery to Simplify XML and Relational Data Integration[ANNOUNCE] BEDFORD, Mass.--Sept. 20, 2005--DataDirect Technologies
    (http://www.datadirect.com), the software industry leader in
    standards-based components for connecting applications to data and an
    operating unit of Progress Software Corporation, today announced the
    release of DataDirect XQuery(TM), the first embeddable component for
    XQuery that is modeled after the XQuery API for Java(TM) (XQJ).
    Developers can download a free trial of DataDirect XQuery today at:
    http://www.datadirect.com/downloads/registration/xquery/index.ssp
    
    "Internet developers typically spend much of their time creating and
    restructuring XML, using data from many sources, generally including
    relational data. This task is much too tedious in most environments.
    Using DataDirect XQuery, which is based on the W3C's XML Query
    (XQuery), simplifies the programming task significantly, solving the
    same problems with much less code," said Jonathan Robie, Program
    Manager for DataDirect XQuery and an editor of the W3C XQuery
    specification. "Using DataDirect XQuery means that your applications
    can run on any Java platform, accessing data from the major relational
    databases, using any Web server or application server, or using no
    server at all. And DataDirect XQuery performs quite well, even when
    your query creates large XML results."
    
    DataDirect XQuery supports all major relational databases, including
    Oracle, Microsoft SQL Server 2000, IBM DB2, and Sybase, on any Java
    platform, allowing developers to query XML, relational databases, or a
    combination of the two. Query results can be used for XML-based data
    exchange, XML-driven Web sites, and other applications that require or
    leverage the power of XML. DataDirect XQuery provides IT professionals
    with a highly productive, powerful, simple, and standards-based
    approach to XML and relational data integration.
    
    Simplifying XML and Relational Data Integration
    
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    providing developers with an XQuery implementation that offers greater
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    publishing are just a few examples of the many types of applications
    that need data from many sources, including relational and XML. For the
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    XML and relational data using industry-standard XQuery. DataDirect
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    ?Interoperability: It's easy to embed DataDirect XQuery in
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    and sent XML data using data stored in an Oracle database," said Mark
    Zimmerman, VP of IT, at Gevity, a leading provider of employee
    management solutions. "We found DataDirect XQuery to be fast, scalable,
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    access code in the middle tier, and not tied to a specific database,
    our application is insulated from any changes in the back end,
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    with DataDirect XQuery."
    
    "Most XQuery implementations either work only with XML files in memory,
    or are bound to a particular database or application server - these are
    serious restrictions if your organization or partners have different
    databases, require scalability, or need to integrate with legacy data,"
    said Jerry King, Vice President of the XML Products Group at DataDirect
    Technologies. "DataDirect XQuery is the first and only product that
    truly makes your XQuery just as portable as your XML - you can use it
    on any Java platform, with any major relational database, and it
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    Availability
    
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    contact Nancy Vodicka at 919-461-4326, or visit our Web site at
    www.datadirect.com/xquery. Developers can also download the DataDirect
    XQuery for a free 15-day trial at:
    http://www.datadirect.com/downloads/registration/xquery/index.ssp
    
    About DataDirect Technologies
    
    DataDirect Technologies is focused on standards-based data
    connectivity, enabling software developers to quickly develop and
    deploy business applications across all major databases and platforms.
    DataDirect Technologies offers the most comprehensive, proven line of
    data connectivity components available anywhere. Developers worldwide
    at more than 250 leading independent software vendors and thousands of
    corporate IT departments rely on DataDirect?products to connect their
    applications to an unparalleled range of data sources using
    standards-based interfaces such as ODBC, JDBC and ADO.NET. Developers
    also depend on DataDirect to radically simplify complex data
    integration projects using XML products based on the emerging XQuery
    and XQJ standards. DataDirect Technologies is an operating unit of
    Progress Software Corporation, a US$300+ million global software
    industry leader. Headquartered in Bedford, Mass., DataDirect
    Technologies can be reached on the Web at www.datadirect.com or by
    phone at +1-800-876-3101.
    
    DataDirect and DataDirect XQuery are trademarks or registered
    trademarks of DataDirect Technologies Corp. in the U.S. and other
    countries. Java and all Java based marks are trademarks or registered
    trademarks of Sun Microsystems, Inc. in the U.S. and in other
    countries. Any other trademarks contained herein are the property of
    their respective owner
    
    Contact:
    DataDirect Technologies
    Nancy Vodicka, 919-461-4326
    email***@***.com
- 13
  - How to Fail at Software DevelopmentHello,
    
    The book "How to Fail at Software Develoopment" is about all the
    strange and funny things people do in the name of developing software.
    I worked in software development for over 20 years and found silly
    things that were being done in the name of software development were
    being repeated again and again. As a matter of fact, most things that
    cause software projects to fail are forever being repeated. And you
    can spot the symptoms if you know what to look for.
    
    Most people running software projects don't have much software
    experience, so their inventions are usually not new. They rediscover
    the same mistakes over and over again. It turned out to be a book of
    very funny scenarios--some I lived through, and some were lived
    through by others.
    
    Those who don't know the history of software failure are doomed to
    repeat it. You can find the book on Amazon or wherever.
    
    Arthur Griffith
    "How to Fail at Software Development"
    http://www.anchorpointbooks.com
- 14
  - slow axis performance vs JAX-RPC?hi..
    
    i've been mainly using axis framework for webservices becouse it's
    simpler, how ever i was told it's the slowers implementions of them
    all, are there any non-commercial frameworks ? simple to use? (and
    production ready not beta).
- 14
  - To getenv or not getenvI'm using 1.4.2 for some commecial development. I was just about to set
    a property and pass it on the command line when I noticed that System.getenv is
    not deprecated in 1.5.0. So is it bad form to use a deprecated 'getenv'
    in 1.4.2 given its new lease of life in 1.5.0??
    
    Being 'allowed' to use getenv would make certain parts of the program
    more expressive.
    
    Cheers,
    Lordy

Author

Message

Alan

Posted: 2005-2-11 5:16:00

Top

java-programmer, Printing using CUPS in Linux and Java 1.5 According to the blurb one of the upgrades in 1.5 is the ability to
print using CUPS in Linux. Does anyone have this working? I cannot get
my Jva application to communicate with CUPS.

Thanks,

Alan

Index ‹ java-programmer

Next
- 1
  - OLAP & OLTP schemas and Java App ServerHi,
    
    (I hope this is the right group to post this. If not I apologize and
    would appreciate pointers.)
    
    We have a Websphere Applicaiton server for our application. We plan to
    have a database that is part relational and part star on DB2 UDB. We
    will need an OLAP tool and may use BRIO.
    
    Some questions on this approach:
    
    1. What is the best way to access the OLAP schema from Java (we plan
    to use hibernate but are concerned about its suitability for star
    schemas).
    Some things that I could think of are:
    - Use hibernate on the star schema (not sure if this is the best)
    - Create as many materialized views as necessary and use hibernate
    - Use java objects running on the DBs JVM (db optimized jvm implying
    better performance?)
    
    2. Is Brio the right tool to use for this scenario?
    I ask because we can't have direct integration with the J2EE
    applicaiton server (We have to give the user a different login page to
    brio to see the reports. But they may take hours to produce.)
    
    3. What are your experiences in combining star and relational tables
    in the same database?
    
    4. Any thoughts on using DB2 OLAP server? Apparently it has reporting
    capabilities and Java support, but unsure if it has any advantages
    over Brio.
    
    Thanks in advance,
    Naga
- 2
  - Windows styleHI! I'm developing an application that is going tu run on windows XP
    Professinal, and I want that the buttons, combo boxes etc every
    component that I use, looks like a windows component, not like a swing
    button for example. I don`t know if anyone understands me.
    I'm using NetBeans IDE, (using jdk 1-4-2).
    
    When I am designing my form and I drag and drop a button for example,
    it has a rounded shape, like a normal windows button, but when I
    compile and run my project, the button is not rounded anymore, and
    doesn't looks like a Windows Button.
    What can I do??
    Thaks a lot!!
- 3
  - Action or Subclass method?I need to know which is the PROPER way of handling this situation:
    
    I would like to be able to cascade all the JInternalFrames in a
    JDesktopPane.
    
    Should I create a
    
    1) cascade() method in a subclass of JDesktopPane? or
    
    2) create a CascadeAction (a subclass of AbstractAction) and pass a
    reference of the JDesktopPane?
    
    Both ways work. HOWEVER, which is the PROPER Object Oriented solution?
- 4
  - Extract all dates from text documentHi,
    
    1) I have a bunch of documents, some of which may contain dates.
    2) For each document, I would like to identify all existing dates.
    3) The dates exist in multiple formats.
    Example: (May 5, 1932), (5,5,1932), (5/5/1932), (5-5-1942) etc.
    4) I would like to process a single document very quickly. In other
    words, i'm looking for a time efficient solution.
    
    Are there any existing parsers that take in a generic text string and
    return a collection of dates found in the text string?
    
    Are there any existing flex/cup files that perform this task?
    
    Thanks.
- 5
  - JNI QuestionOn Mar 2, 2:17 pm, Gordon Beaton <email***@***.com> wrote:
    > On 2 Mar 2007 08:05:22 -0800, Edsoncv wrote:
    >
    > > If I have only the C part, I would cast the "native1" object, pass
    > > to "setup" and cast back the object, but since the setup function is
    > > called from java, I don't know how to access native1 object from
    > > "setup". Is it possible?
    >
    > Of course.
    >
    > Either store it someplace in the native code where it's visible to
    > both methods (i.e. not as a local variable in solve() like your
    > example).
    >
    > Or, remembering that even native methods have return values, return it
    > to the caller (cast to jlong) so that it can be passed back to the
    > next method, where you cast it back to the appropriate pointer type
    > before attempting to use it.
    >
    > /gordon
    >
    > --
    > [ don't email me support questions or followups ]
    > g o r d o n + n e w s @ b a l d e r 1 3 . s e
    
    Thanks Gordon, I think I'll pick the second option.
- 6
  - reading Mouse MOVE events without moving pointerHi,
    
    Does anyone know of way of setting up a java app so that a instead of
    mouse movements being used to update the pointer, the mouse move could
    be used to update, say, the viewport of a document?
    
    An example in more detail;
    what I want to do is use the mouse MOVE event that is caused by the
    movement of the mouse, but not update the pointer position (I would
    like the pointer to remain still or be invisble) but to allow me to
    update the viewport on a document. ie, user presses a 'trigger' key
    to put the code into a receptive mode, then all subsequent mouse
    movements (triggering mouse MOVE events) can be captured and used to
    update the viewport location- ie, mouse moves left, pointer remains
    still, viewport moves left.
    
    I don't know if this is possible due to the OS independance that java
    has. Maybe a solution involves the glass-pane in some (I am not
    familiar with the glass- yet. It is one of my avenues to search...)
    
    Thanks for any ideas... mucho thanks for any code examples....
    
    M.
- 7
  - openGL java and X - server: a crashHy folks,
    I didn't know exactly where to post, in the end I decided for this
    forum, since we are talking about java, GL4java on linux environment.
    
    We are developing a java interface for the GIS GRASS
    (http://grass.itc.it) using GL4java calls for raster visualization.
    
    I'm not the developer that works on the GL part. On his computer
    everything compiles and works alright.
    
    When I run the application, when the first GL call comes (i assume
    so), the X server shuts down and restarts. In the /var/log/message the
    only line that defines what happened, is:
    kdm[2232]: Server for display :0 terminated unexpectedly
    Nothing else!
    
    I use Suse 9 (I upgraded from 8.2 hoping to solve that problem, but no
    way) which a Toshiba Satellite 5200-801 which loads an NVIDIA GeForce4
    460 Go.
    I downloaded and installed the drivers supplied by Nvidia and they
    work perfect for everything but this.
    
    I know NVIDIA to be unstable with linux nowadays, but I can't work
    this way!
    Has anyone encountered the same or similar problem?
    
    Regards,
    Andrea
- 8
  - tridimensional view in B&WI made a program with java3d and I can print views from it.
    I want to print only the lines like the wireframe but without hide lines
    
    Have you same Ideas??
    
    zeno
- 9
  - about static variableViv,
    
    Viv wrote:
    >I mean to say that the objects will get garbage collected but not the
    >static variables. Class will remain in memory till the JVM shutdown.
    >
    >Roedy wrote :
    >The only way you can recover the ram from a static class object is to
    >load it with a custom classloader, then drop even the reference to the
    >class loader.
    >
    >You can try what Roedy said.
    
    What means "recover the ram from a static class object"? What do you mean
    "recover"? I think there is not static class object -- only static class
    members.
    
    Do you know where can I find a sample dealing with how to write a customized
    ClassLoader with the functions as you mentioned?
    
    regards,
    George
    
    --
    Message posted via JavaKB.com
    http://www.javakb.com/Uwe/Forums.aspx/java-setup/200511/1
- 10
  - \n troublesOK, again I have troubles dealing with String. I have a field of the type
    String which contains some text that is separated into lines at random
    places, or in other words, the text contains \n\r (or \n in the case of
    linux). I write this field into a file and there it looks ok, but when I
    read it back I get the whole string in one line. So I figured I'd add a
    separator at the end of each line. However, then I get an empty line after
    each line! I'm using GZIP to pack the data, so perhaps that is causing this?
    Btw. after each block of text I write an end-of-block string to know that
    it's the end of that block.
    Here's the explanation in code:
    
    String notes = ""; // the result
    String lin = ""; // used to read one line from the file
    final String eob = "---$#-||-"; // end of block
    lin = filein.readLine(); // I'm reading the 1st line
    
    while (lin.compareTo(eob) != 0) {
    notes += lin + System.getProperty("line.separator");
    lin = filein.readLine();
    if (lin == null) { break; } // this will never occur, but just in case
    }
    return notes;
    
    //-------------
    // filein is a BufferedReader
    // I can't change that, don't ask why, and
    // because of that this is how I read a file
    filein = new BufferedReader(
    new InputStreamReader(
    new BufferedInputStream(
    new GZIPInputStream(
    new FileInputStream("testFile.gz"))))));
    
    I figured I could erase one empty line after the reading-in is done, but I'm
    not sure if this will happen in every case, on every computer. I'm thinking
    it could be an anomaly for Windows files.
    Anyway, I'm waiting for some suggestions ;)
    
    Gajo
- 11
  - applet is not initiallising.what's wrong with this source code.
    
    it is showing the message applet is not initiallising.
    --------------------------------------------------------------------------------------------------------------------------------------
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    
    public class LinearSearch extends JApplet implements ActionListener
    {
    JLabel enterLabel;
    JTextField enter;
    JTextArea outputArea1, outputArea2;
    JButton search;
    String output;
    int a[];
    
    public void init()
    {
    a=new int[Integer.parseInt(JOptionPane.showInputDialog("how many
    numbers, you want to input:"))];
    
    for(int i=0; i<a.length; ++i)
    a[i]=Integer.parseInt(JOptionPane.showInputDialog("enter the
    integer number."));
    
    output="numbers are:\n";
    for(int i=0; i<a.length; ++i)
    output += " "+a[i];
    
    for(int i=1; i<a.length; ++i)
    for(int j=0; j<=a.length-1; ++j)
    if(a[j]>a[j+1])
    {
    int t=a[j];
    a[j]=a[j+1];
    a[j+1]=t;
    }
    
    output += "\n\nnow numbers are in ascending order.\n";
    for(int i=0; i<a.length; ++i)
    output += " "+a[i];
    
    Container c=getContentPane();
    c.setLayout(new FlowLayout());
    
    outputArea1=new JTextArea();
    c.add(outputArea1);
    outputArea1.setText(output);
    
    enterLabel=new JLabel("enter the number, you want to search.");
    c.add(enterLabel);
    
    enter=new JTextField(10);
    enter.addActionListener(this);
    c.add(enter);
    
    outputArea2=new JTextArea();
    c.add(outputArea2);
    
    search=new JButton("new search");
    search.addActionListener(this);
    c.add(search);
    }
    
    public void actionPerformed(ActionEvent e)
    {
    if(e.getSource() == enter)
    {
    int subscript=linearSearch(a,
    Integer.parseInt(e.getActionCommand()));
    
    if(subscript != -1)
    outputArea2.setText("number found at position no. "+subscript+"
    in the sorted list.");
    
    else
    outputArea2.setText("Sorry!!! number not found. \n\nhave a look
    on new search");
    }
    
    else
    JOptionPane.showMessageDialog(null, "Please click on the Applet
    menu on the menu Bar.\n"+"click on the clone option.\n"+"Repeat the
    search process again.");
    }
    
    public int linearSearch(int b[], int k)
    {
    for(int i=0; i<b.length; ++i)
    if(b[i] == k)
    return i;
    
    return -1;
    }
    }
    
    ---------------------------------------------------------------------------------------------------------------------------------------
    it is asking for no. of elements. and input the numbers. but after then
    applet is not able to initialise.
- 12
  - JMF, FrameAccess, sound, faster processingI used JMF's example class FrameAccess to process audio/video files. The
    Processor processes data according to the frame rate specified in the file.
    
    1. Is there a way to do this processing faster? I don't want to view (and listen
    to) those vids, just process them. I'm ready to use 100% of the CPU if need be.
    
    2. As the file is processed, a sound is generated and can be listened to through
    a sound card's output. Is this entirely necessary? I'm asking because I want to
    process files simultaneously and that would result in a cacophony. Besides, say
    I want to listen to my own music while the processing takes place.
    
    3. How does one extract sound from a video file? Can it be extracted as a whole?
    Can it be broken down into chunks according to extracted image frames? How? In
    which formats? I'm stuck in an implementation of Codec interface, much like
    JMF's example PreProcessCodec.java, but with AudioFormat (supported ins and
    outs), so I can access a sound frame through a Buffer, but I don't know how to
    proceed.
    
    Thanks for any insight.
- 13
  - How to listen out for a stream of data coming from (web)serverHello
    
    I have an applet that connects to a server (same location as web server) and
    connects to a server on a socket. This all works fine for sending commands
    to this server. But the server can send data to the client at any moment in
    time. So how do I listen out for the activity? do I launch a separate thread
    that sits listening for incoming data?
    
    What is the way to do it?
    
    Angus
- 14
  - Oracle JDBC and AppletHello
    I have an applet which download files to local computer from database
    (files are saved as BLOB fileds).
    Applet is signed bud when I want to get connection to Oracle (method
    getConnection from OracleDataSource) i have following error:
    
    java.security.AccessControlException: access denied
    (java.util.PropertyPermission oracle.jserver.version read)
    
    Applet working only when I running it from JBuilder. Otherwise the
    error comes.
    
    I can't see other posibility than using applets because number of
    files is very big. For example 20 000 to take at once, so the normal
    download method via http is not good here. Also the size of one
    download may be up to 1GB.
    
    Thanks for help
    
    Bartek
- 15
  - for wanids: very enticing tunes - gudri wonhe - (1/1)On Tue, 06 Sep 2005 23:52:20 +0200, bone wrote:
    
    > Hello all?
    Oh, ..you too?
    
    This sh*t is commonly known as SPAM. Stop it, before I
    have to send the boys around.
    
    --
    Andrew Thompson
    physci.org 1point1c.org javasaver.com lensescapes.com athompson.info
    "Who gave you the power? WE DID!!"
    Alice Cooper 'Department of Youth'