java-programmer >>Anyone using Studio 4 with MSAccess as DBMS?

Anyone using Studio 4 with MSAccess as DBMS?

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- 3
  - Servlet for Connection Pooling in NetBeans & builtin TomcatHi,
    
    I installed Netbeans 4.0 a few days ago and so far pretty impressed by
    it. Previously I was using Tomat 4.0, and I like the idea of embedded
    Tomcat 5 that can be managed via the IDE. To get things started, I
    followed the article here:
    
    http://www.netbeans.org/kb/using-netbeans/40/dbconn.html
    
    to get a connection pool configured in the included Tomcat 5 web
    server. Everything in the example works great. However, I don't want
    to use the taglibs, and would rather write servlets and beans to do
    the task. I tried following the example listed here:
    http://jakarta.apache.org/tomcat/tomcat-5.0-doc/jndi-datasource-examples-howto.html
    however that doesn't work for me (I get foo -1 or something; basically
    its not working).
    
    So I was wondering if someone could kindly provide me a simple servlet
    that works in the Netbeans IDE so I can simply extend on the tutorial
    here: http://www.netbeans.org/kb/using-netbeans/40/dbconn.html and and
    draw connection from the tomcat 5 connection pool having configured
    everything perfectly in this tutorial. Basically do the same thing as:
    
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <%@ taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql" %>
    
    <sql:query var="queryresults" dataSource="jdbc/poolDB">
    SELECT * FROM t_emp ORDER BY upper(f_name)
    </sql:query>
    
    <table border=1>
    <tr>
    <th>First</th><th>Last</th>
    </tr>
    <c:forEach var="row" items="${queryresults.rows}">
    <tr>
    <td><c:out value="${row.f_name}" /></td>
    <td><c:out value="${row.l_name}" /></td>
    </tr>
    </c:forEach>
    </table>
    
    but in a servlet rather than using the tag library.
    
    Very much appreciated!
- 3
  - How to load INI file to JTree Nodes?Hi,
    
    I am new to JAVA SWING and would like someone to help me out here.
    I need to read the INI file to load out the structure and display them
    on the JTree.
    
    How can I go about doing that?
    
    The INI file format looks like following:
    
    [R]
    ChildsCount = 2
    C1 = Enclosure(s)
    C2 = JBOD(s)
    
    [R\C1]
    ChildsCount = 2
    C1 = EnclosureWWN A
    C2 = EnclosureWWN B
    
    [R\C1\C1]
    ChildsCount = 6
    C1 = Power Supply
    C2 = Fan
    C3 = Battery
    C4 = Numeric Sensor
    C5 = Controller
    C6 = Device Group(s)
    
    [R\C1\C1\C1]
    ChildsCount = 2
    C1 = PSU0
    C2 = PSU1
    
    [R\C1\C1\C2]
    ChildsCount = 2
    C1 = Fan0
    C2 = Fan1
    
    [R\C1\C1\C3]
    ChildsCount = 2
    C1 = UPS
    C2 = Motherboard
    
    [R\C1\C1\C4]
    ChildsCount = 3
    C1 = NS0
    C2 = NS1
    C3 = NS2
    
    [R\C1\C1\C5]
    ChildsCount = 2
    C1 = ControllerWWN A
    C2 = ControllerWWN B
    
    [R\C1\C1\C6]
    ChildsCount = 7
    C1 = Device Group A
    C2 = Device Group B
    C3 = Device Group C
    C4 = Device Group D
    C5 = Device Group E
    C6 = Device SubGroup A
    C7 = Device SubGroup B
    
    [R\C1\C1\C6\C1]
    ChildsCount = 3
    C1 = Volume 1
    C2 = Volume 2
    C3 = Volume 3
    
    [R\C1\C1\C6\C1\C1]
    ChildsCount = 2
    C1 = LUN0
    C2 = LUN1
    
    [R\C1\C1\C6\C1\C1\C1]
    ChildsCount = 4
    C1 = Host A
    C2 = Host B
    C3 = Host C
    C4 = Host D
    
    [R\C1\C1\C6\C1\C1\C2]
    ChildsCount = 2
    C1 = Host A
    C2 = Host C
    
    In the JTree it should shows something like this:
    
    Enclosure(s)
    |__EnclosureWWN A
    |__Power Supply
    |__PSU0
    |__PSU1
    |__Fan
    |__Battery
    |__Numeric Sensor
    |__Controller
    |__Device Group(s)
    
    |__EnclosureWWN B
- 4
  - [OT?] Upgrade Eclipse from 3.0.2 to 3.1.1?I'm getting behind with Eclipse and would like to upgrade from my current
    version, 3.0.2, to the newest stable version, 3.1.1.
    
    Unfortunately, it's been so long since I upgraded from 3.0.1 to 3.0.2 that I
    can't remember the process for upgrading! I thought I went into
    Help/Software Updates/[something?] but can't remember more than that;
    everything I try under Help/Software Updates fails to find any newer
    versions of Eclipse Platform. All I was able to find was a newer level of
    one of my plugins.
    
    Can someone kindly remind me of the upgrade process for going from 3.0.2 ->
    3.1.1?
    
    I'm prepared to download 3.1.1 from the Eclipse site and install it parallel
    to 3.0.2 the way I used to Version 2.0.x of Eclipse but I thought that sort
    of thing wasn't necessary any more....
    
    --
    Rhino
- 5
  - Back To College Is Here!Big, Big Savings!
    
    College '07. Live. Study. Save. Back To College is one of our largest
    campaigns of the year! Help our customers find the essentials they
    need for college living at unbeatable prices.
    Most See!
    Click: http://ashopper.net
    Donot miss out!
- 8
  - modeling possible polymorphism?hi..
    
    i have entity called AssuredPerson and entity called PolicyOwner, both
    have similar attributes (meaning Abstract Person Class)
    
    however an AssuredPerson can be PolicyOwner (but not the way around).
    
    so i've added a property called isPolicyHolder (boolean) to
    AssuredPerson.
    
    is this correct way to go about it?
- 8
  - Binary search Tree:HelpIs this implementation of a binary search tree correct ?
    
    numbers from 0 to 14 arranged in a binary tree (binary search tree). Is
    this correct ? (left node is less, right node is greater than the
    current node)
    
    7
    6 8
    5 9 2 12
    4 10 3 11 1 13 0 14
- 8
  - simple STRUTS appi want to realize a simple struts app for creation of polls, can you
    help me with ideas or examples?
    a very very simple app but with "area" containers...and a simple
    graphical representetion of the results...
    
    tnx
- 9
  - A java network sniffer for WindowsHi everybody,
    
    If you want to listen or publish Ethernet packet with Java, please try
    Jiffer.
    You can download Jiffer here : http://aroche.free.fr
    
    If you have any suggestion or experience problem to install Jiffer
    please contact.
    
    Have fun !!
    
    Arnaud ROCHE
- 9
  - java.security.NoSuchAlgorithmException: No such algorithm: RSAI have this code
    
    import java.io.*;
    import java.security.*;
    import javax.crypto.*;
    
    class Encrypt {
    private Cipher RSAtransform;
    
    public Encrypt()
    {
    
    Provider rsajca = new com.sun.rsajca.Provider();
    Security.addProvider(rsajca);
    try
    {
    RSAtransform = Cipher.getInstance("RSA",rsajca);
    }
    catch (NoSuchAlgorithmException e) {
    e.printStackTrace();
    }
    catch (NoSuchPaddingException e) {
    e.printStackTrace();
    }
    
    }
    ...
    ...
    
    But when I run it on winxp (using Java 1.4.2) I get:
    
    java.security.NoSuchAlgorithmException: No such algorithm: RSA
    at javax.crypto.SunJCE_b.c(DashoA6275)
    at javax.crypto.SunJCE_b.a(DashoA6275)
    at javax.crypto.Cipher.a(DashoA6275)
    at javax.crypto.Cipher.getInstance(DashoA6275)
    at keys.Encrypt.<init>(Encrypt.java:18)
    at keys.Encrypt.main(Encrypt.java:115)
    java.lang.NullPointerException
    at keys.Encrypt.encrypt(Encrypt.java:73)
    at keys.Encrypt.main(Encrypt.java:128)
    
    Why is it not possible to use the RSA algorithm?
    
    I would prefer to use an asymmetric algorithm instead of DES.
    
    Hope someone can help
    
    JOhs
- 10
  - Resize JSplitPane ContanierHi all,
    
    I want to resize the container which holds JSplitPane. The situation
    is with right button pressed the container should be resized to the
    size of left component of JSplitpane and with left button pressed
    container should be expanded to the size of left component +
    Jsplitpane + right component, unlike the default behaviour of
    JSplitpane. How can i acheive this?
    
    Thanks in advance.
    
    Naveen.
- 12
  - JavaMail: Dump a Message object to file, rebuild later - Possible or not?Has someone used the MimeMessage class to serialized,
    for saving to disk and then load it back to a Message object again?
    
    Thanks
- 13
  - Fwd: Problem saving Java file in Eclipse on Debian...I forgot to mention that I am using Debian Version 3.1.2-2 of Eclipse.
    
    Scott Huey
    
    ---------- Forwarded message ----------
    From: Redefined Horizons <email***@***.com>
    Date: Jul 14, 2006 5:04 PM
    Subject: Problem saving Java file in Eclipse on Debian...
    To: email***@***.com
    
    I was told about the Java mailing list on the general user list for
    Debian. I wish I would have found it sooner!
    
    I hope I can help support Java on Debian.
    
    I have a few questions I was hoping to find answers to this morning.
    I'll ask the first one here.
    
    I'm running Debian Etch and I'm having trouble saving Java files in
    Eclipse. I can save any other type of file, but not Java files. Here
    is the error I receive:
    
    SAVE FAILED:org/eclipse/ui/editors/text/TextFileDocumentProvider
    
    $FileInfo.fElement
    
    I did some online searching for this error message and found this:
    
    https://bugs.eclipse.org/bugs/show_bug.cgi?id=126830
    
    However, I have installed Blackdown's JDK and have it set as the
    default Java environment for my system. I've also set the JAVA_HOME
    variable to point to the Blackdown JDK in my /etc/profiles file.
    
    Is anyone else having this problem? How might I fix it? If this is a
    bug, do I need to file a bug report with the maintainers of the
    Eclipse packages?
    
    Thanks,
    
    Scott Huey
    
    --
    To UNSUBSCRIBE, email to email***@***.com
    with a subject of "unsubscribe". Trouble? Contact email***@***.com
- 16
  - MyCalendar subclass and threadingI have an application that deals with alot of dates, I have classes that
    represent time & duration. I do not need to cart around the beast that is
    GregorianCalendar.
    However I do need to use it to convert data.
    
    eg:
    gregCal.setTime(myDate);
    gregCal.get(Calendar.DATE);
    gregCal.get(Calendar.MONTH_OF_YEAR); // etc
    
    Also I really need a different Calendar, something that I can do this with
    
    myCal.isSpecialDay();
    
    So I'm wondering whether I should subclass Calendar/Gregorian to add my
    special dates.
    
    Because I don't see the need to have an instance of this in my time/duration
    objects, I'm thinking, I could have a Singleton MyCalendar to use for look
    ups.
    
    At present there isn't a threading issue, just one thread. But I'd like to
    make it thread safe, none the less. Also if there are multiple threads
    eventually, I should convert my Singleton to an Object pool - right?
    
    Anyhow I'd need to synchronise over several calls within MyCalendar to make
    sure the date is setup and retrieved correctly:
    
    synchronized public boolean isSpecialDay(Date date) {
    setTime(date);
    return isSpecialDay();
    }
    Presumably I should make all methods that set the date synchronized also?
    
    I know there is probably some bad stuff above, how should I do this please?
    
    --
    Mike W
- 16
  - Java compiler with inline bytecode?Does anyone know of a java compiler that allows inline "java assembly
    mnemonics" to be included in amongst the standard java code?
    
    Similar to the inline asm keyword in C/C++ compilers...
    
    Cheers :o)
    
    Will
- 16
  - Custom JComponent: add to contentPaneHello,
    
    I created a custom JComponent which consists of two JTables on a
    JScrollPane.
    My problem is when I add a JDividedTable instance to the content pain of a
    JFrame,
    I only see a grey frame with the preferredSize of the scrollpane of my
    custom component.
    When I pass the contentPane of the Frame to the constructor of
    JCustomComponent
    and contentPane.add(scrollPane) call at the end everything works fine.
    
    The solution with the contentPane as parameter in the constructor is not
    desirable in thougths of
    reusability and flexibility.
    
    Can anybody tell me what is wrong?
    
    I want to use it like this from a JFrame, for example:
    
    public class MyApp extends JFrame {
    
    public MyApp() {
    Container cp = getContentPane();
    ....
    
    JDividedTable dividedTable = new JDividedTable(someModel,3);
    cp.add(dividedTable);
    ...
    }
    
    public static void main ....
    
    In JCustomComponent I override set getter and setter methods for the
    preferred, maximum and minimum
    size of JComponent.
    
    Here is the source of my Component:
    
    -------------------------------------------------------------------------
    import java.awt.Container;
    import java.awt.Dimension;
    import java.awt.event.MouseAdapter;
    import java.awt.event.MouseEvent;
    import java.awt.event.MouseListener;
    
    import javax.accessibility.AccessibleContext;
    import javax.swing.JComponent;
    import javax.swing.JScrollPane;
    import javax.swing.JTable;
    import javax.swing.event.ListSelectionEvent;
    import javax.swing.event.ListSelectionListener;
    import javax.swing.table.JTableHeader;
    import javax.swing.table.TableColumnModel;
    import javax.swing.table.TableModel;
    
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    
    /**This swing UI class provides a
    * {@link javax.swing.JTable JTable} in a {@link javax.swing.JScrollPane
    * JScrollPane} with fixed columns on the left side and
    * horizontal scrollable columns on the right side. The number of fixed
    * columns is user defined within the constructor.<br><br>
    *
    * The divided table is constructed out of two JTable's with the same
    * TableModel. The fixed table is installed as RowHeaderView on the
    * JScrollPane. From the scrollable table's TableColumnModel the
    * first <code>fixedCols</code> are removed.
    *
    */
    public class JDividedTable extends JComponent {
    
    private static final Log log = LogFactory.getLog(JDividedTable.class);
    
    /* ==================================================================== */
    /**
    * Cronstructs a <code>JDividedTable</code> in a <code>JScrollPane</code>
    * with a number of <code>fixedCols</code> on the left.
    *
    * @param dm The underlying tableModel of this table.
    * @param fixedCols The number of fixed columns on the left side.
    * @param contentPane The container the table should be installed on.
    */
    public JDividedTable(TableModel dm, int fixedCols, Container contentPane)
    {
    fixedColumns = fixedCols;
    
    initDividedTable(dm, null);
    
    removeFixedColsFromScrollableTable();
    
    synchronizeSelection();
    
    putTablesOnContainer(contentPane);
    }
    
    /* ==================================================================== */
    /**
    * Cronstructs a <code>JDividedTable</code> in a <code>JScrollPane</code>
    * with a number of <code>fixedCols</code> on the left. The data are
    * arranged according to <code>sorter</code> if a sorter is provided.
    *
    * @param dm The underlying tableModel of this table.
    * @param fixedCols The number of fixed columns on the left side.
    * @param sorter A custom sorter (optional).
    * @param contentPane The container the table should be installed on.
    */
    public JDividedTable(TableModel dm, int fixedCols, AbstractSortDecorator
    sorter,
    Container contentPane) {
    fixedColumns = fixedCols;
    
    initDividedTable(dm, sorter);
    
    removeFixedColsFromScrollableTable();
    
    synchronizeSelection();
    
    putTablesOnContainer(contentPane);
    }
    
    /* ==================================================================== */
    /**Gets the actual sort decorator.
    * @return The sort decorator.
    */
    public AbstractSortDecorator getSortDecorator () {
    return customSorter;
    }
    
    /* ==================================================================== */
    /**Adds a new <code>AbstractSortDecorator</code> to the divided table.
    * @param sorter The new sort decorator.
    * @throws IllegalArgumentException If sorter is null.
    */
    public void setSortDecorator(AbstractSortDecorator sorter)
    throws IllegalArgumentException{
    
    if (sorter == null) {
    log.error("AbstractSortDecorator can't be set to 'null'");
    throw new IllegalArgumentException("AbstractSortDecorator " +
    "can't be set to 'null'");
    } else {
    
    if (log.isInfoEnabled()) {
    log.info("Adding a sorter to the divided table: '" +
    sorter + "'");
    }
    
    customSorter = sorter;
    fixedTable.setModel(customSorter);
    scrollableTable.setModel(customSorter);
    
    removeFixedColsFromScrollableTable();
    
    setMouseListenerToHeader(false);
    }
    }
    
    /* ==================================================================== */
    /**Allows to reorder interactively the columns in the scrollable table
    * if <code>allowed</code> is true.
    * @param allowed Allow reordering of columns? Per default it is set to
    true.
    */
    public void setHeaderReorderingAllowed(boolean allowed) {
    scrollableTable.getTableHeader().setReorderingAllowed(allowed);
    }
    
    /* ==================================================================== */
    /**Sets the mouse listeners for the table headers of both tables for the
    * sorter and synchronizes both models. When the listener is set to true
    * the user can sort the table interactively by clicking on the table
    * headers. If it is set to false, the table is sorted according
    * to the fixed sort criteria defined in the sorter.<br>
    * The default for the divided table is 'listeners off'.<br>
    * After a mouseClicked event both tables needs to be repainted because
    * otherwise their were problems encountered with updating of the two
    * table components.
    *
    * @param mouseListenerOn Set or remove the listener to/from the headers,
    * per default it is set to false. It only adds a
    * listener if the divided table has a sorter.
    */
    public void setMouseListenerToHeader(boolean mouseListenerOn) {
    JTableHeader fixedHdr = (JTableHeader) fixedTable.getTableHeader();
    JTableHeader scrollableHdr = (JTableHeader)
    scrollableTable.getTableHeader();
    MouseListener fixedListener = null;
    MouseListener scrollableListener = null;
    
    if ((mouseListenerOn == true) && (customSorter != null)) {
    fixedListener = new MouseAdapter() {
    public void mouseClicked(MouseEvent e) {
    TableColumnModel tcm = fixedTable.getColumnModel();
    int vc = tcm.getColumnIndexAtX(e.getX());
    int mc = fixedTable.convertColumnIndexToModel(vc);
    customSorter.sort(mc);
    fixedTable.repaint();
    scrollableTable.repaint();
    }
    };
    fixedHdr.addMouseListener(fixedListener);
    
    scrollableListener = new MouseAdapter() {
    public void mouseClicked(MouseEvent e) {
    TableColumnModel tcm = scrollableTable
    .getColumnModel();
    int vc = tcm.getColumnIndexAtX(e.getX());
    int mc = scrollableTable
    .convertColumnIndexToModel(vc);
    customSorter.sort(mc);
    fixedTable.repaint();
    scrollableTable.repaint();
    }
    };
    scrollableHdr.addMouseListener(scrollableListener);
    } else if (customSorter != null) {
    // If the listener is null, no action is performed by
    removeMouseListener().
    fixedHdr.removeMouseListener(fixedListener);
    scrollableHdr.removeMouseListener(scrollableListener);
    customSorter.sort();
    }
    }
    
    /* ==================================================================== */
    /**Creates and initializes the divided table.
    *
    * @param dm The TableModel.
    * @param sorter The sort decorator for this table.
    */
    private void initDividedTable(TableModel dm, AbstractSortDecorator
    sorter) {
    
    // Try to set sorter between model and view.
    if (sorter != null) {
    
    if (log.isInfoEnabled()) {
    log.info("Creating a divided table with sorter '" +
    sorter.toString() + "'");
    }
    
    customSorter = sorter;
    fixedTable = new JTable(customSorter);
    scrollableTable = new JTable(customSorter);
    
    setMouseListenerToHeader(false);
    } else {
    
    if (log.isInfoEnabled()) {
    log.info("Creating a divided table without sorter");
    }
    fixedTable = new JTable(dm);
    scrollableTable = new JTable(dm);
    }
    
    // Reordering not allowed, because wanted columns can be substituted
    with
    // unwanted ones in the fixed table with this option set to true.
    fixedTable.getTableHeader().setReorderingAllowed(false);
    fixedTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    
    scrollableTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    }
    
    /* ==================================================================== */
    /**Removes the columns said to be fix from the scrollableTable
    TableColumnModel,
    * sets the column width of fixedTable-columns to fixed size and
    * sets the viewport size of fixedTable to the width of the fixed columns.
    */
    private void removeFixedColsFromScrollableTable() {
    TableColumnModel tcm = scrollableTable.getColumnModel();
    // columnMargin necessary for displaying the grid line.
    Dimension dim = new
    Dimension(fixedTable.getColumnModel().getColumnMargin(),0);
    
    for(int i = 0;i < fixedColumns; i++) {
    dim.width += tcm.getColumn(i).getPreferredWidth();
    fixedTable.getColumnModel().getColumn(i).setResizable(false);
    
    // always delete the first column because columns in tcm are reordered
    // after deletion
    tcm.removeColumn(tcm.getColumn(0));
    }
    fixedTable.setPreferredScrollableViewportSize(dim);
    }
    
    /* ==================================================================== */
    /**Creates the scrollPane for scrollableTable and setting its upper
    * left corner view to fixedTable. Finally the scrollpane is installed
    * on the provided container.
    *
    * @param contentPane The container the tables should get installed on.
    */
    private void putTablesOnContainer(Container contentPane) {
    scrollPane = new JScrollPane(scrollableTable);
    
    scrollPane.setRowHeaderView(fixedTable);
    scrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER,
    fixedTable.getTableHeader());
    
    //with this line everything is ok:
    contentPane.add(scrollPane);
    }
    
    /* ==================================================================== */
    /**Allows only the selection of one row and synchronizes the selection
    * in both tables. Both tables should be represented to the user as one.
    * Therefore the selection model of the tables must be synchronized.
    */
    private void synchronizeSelection() {
    
    fixedTable
    .getSelectionModel()
    .addListSelectionListener(new ListSelectionListener() {
    public void valueChanged(ListSelectionEvent evt) {
    int selRowIndex;
    
    selRowIndex = fixedTable.getSelectedRow();
    // only one row can be selected
    scrollableTable.setRowSelectionInterval(selRowIndex, selRowIndex);
    fixedTable.setRowSelectionInterval(selRowIndex, selRowIndex);
    }
    });
    
    scrollableTable
    .getSelectionModel()
    .addListSelectionListener(new ListSelectionListener() {
    public void valueChanged(ListSelectionEvent evt) {
    int selRowIndex;
    
    selRowIndex = scrollableTable.getSelectedRow();
    // only one row can be selected
    fixedTable.setRowSelectionInterval(selRowIndex, selRowIndex);
    scrollableTable.setRowSelectionInterval(selRowIndex, selRowIndex);
    }
    });
    }
    
    /* ==================================================================== */
    /* (non-Javadoc)
    * @see java.awt.Component#getPreferredSize()
    */
    public Dimension getPreferredSize() {
    return scrollPane.getPreferredSize();
    }
    
    /* ==================================================================== */
    /* (non-Javadoc)
    * @see javax.swing.JComponent#getMaximumSize()
    */
    public Dimension getMaximumSize() {
    return scrollPane.getMaximumSize();
    }
    
    /* ==================================================================== */
    /* (non-Javadoc)
    * @see javax.swing.JComponent#getMinimumSize()
    */
    public Dimension getMinimumSize() {
    return scrollPane.getMinimumSize();
    }
    
    /* ==================================================================== */
    /* (non-Javadoc)
    * @see javax.swing.JComponent#setMaximumSize(java.awt.Dimension)
    */
    public void setMaximumSize(Dimension maximumSize) {
    scrollPane.setMaximumSize(maximumSize);
    }
    
    /* ==================================================================== */
    /* (non-Javadoc)
    * @see javax.swing.JComponent#setMinimumSize(java.awt.Dimension)
    */
    public void setMinimumSize(Dimension minimumSize) {
    scrollPane.setMinimumSize(minimumSize);
    }
    
    /* ==================================================================== */
    /* (non-Javadoc)
    * @see javax.swing.JComponent#setPreferredSize(java.awt.Dimension)
    */
    public void setPreferredSize(Dimension preferredSize) {
    scrollPane.setPreferredSize(preferredSize);
    }
    
    /* ==================================================================== */
    /** The JTable with fixed columns shown on the left. Not horizontally
    scrollable. */
    private JTable fixedTable;
    /** The JTable with horizontally scrollable columns. */
    private JTable scrollableTable;
    /** The JScrollPane the JTables are installed on. */
    private JScrollPane scrollPane;
    /** The sorter for this divided table. */
    private AbstractSortDecorator customSorter = null;
    /** Stores the number of fixed columns on the left. */
    private int fixedColumns;
    }

Author

Message

mdrafn

Posted: 2003-12-6 5:16:00

Top

java-programmer, Anyone using Studio 4 with MSAccess as DBMS? Is anyone using the Studio4 (Community version, Windows NT) IDE for
building forms using an MS Access database to supply a JTable via
net.beans palette components (nBCachedRowSet or nJcdbRowSet)? (Using
the JDBC-ODCB bridge). I can succesfully connect and initialize
components--can see the tables and columns in the Runtime explorer
connection--but when I execute the form, all columns are blank.

Also, when GUI editing, if I try to set the TableModel using the
TableEditor tab and select the nBCachedRowSet component, I get the
following error: "Unable to fetch columns; SQL-server rejected
establishment of SQL-connection. PointBase." Why is it still looking
at Pointbase?

Here's how components are set:
connectionSource1
Database URL = jdbc:odbc:IM_EDITOR (this works with MSQuery, so ODBC
is good)
Driver = sun.jdbc.odbc.JdbcOdbcDriver (ok here)
nBCachedRowSet1
command = select * from IM (this also works in MSQuery)
Database URL = jdbc:odbc:IM_EDITOR
jTable1
selection Model = nBCachedRowSet1

Need more code?

I give up! I really want to use Access for the DBM due to other
issues, but I am running out of patience!
TIA
Frustrated...
Mark

Index ‹ java-programmer

Next
- 1
  - IndexOf for whitespaceWhat if you wanted the indexOf either a space or a \n whichever came
    first. Have you a slick way to code that?
    
    Pedestrian possibilities include:
    
    1. pair of indexOfs , take minimum ignoring <0s.
    
    2. Write a loop that uses charAt
    
    3. write a regex
    
    Is there a slick way to handle it?
    --
    Roedy Green, Canadian Mind Products
    The Java Glossary, http://mindprod.com
- 2
  - McDonalds/RoundTable, design&farm (was: I'm still waiting for ...)> From: email***@***.com (Michael Sullivan)
    > ... instead of looking for exactly and precisely the kind of work
    > that you have done in the distant past, ...
    
    You're displaying a serious misconception. I'm available for any legal
    work where I'd be doing something actually useful so that it would be
    worth paying me to do it. It's the employers who refuse to even
    consider people who haven't done exactly the same kind of work before.
    
    > Go work at McDonalds
    
    I tried that, when I had less than one year work experience. The
    manager at the McDonalds on El Monte near El Camino Real told me that
    because I have a college degree he won't consider me for employment
    because he'd waste two months training me and then I'd find a better
    job elsewhere and he'd be out the expense of training. Later that year
    I got a job at Round Table Pizza on University in Palo Alto, where a
    ditzy redhead Mrs. Masinter wasn't watching where she was going and
    collided with my car and then freaked out seeing the car parts strewn
    on the pavement, apologizing, exchanging insurance info, then she drove
    off before giving me a chance to inspect the damage and see that all
    the damage was to *her* car, not mine. Anyway, Round Table fired me
    because I suffer a learning disability, unable to memorize the prices
    on the menu. A year or two later I was sitting at a terminal at the
    A.I. lab doing my usual work for free, and occasionally running FINGER
    to see who else was around, when I saw Larry Masinter logged in, so I
    wwnt over and asked if he was in any way related to that ditzy driver,
    and indeed that was his former wife. He showed me Lisp for the first
    time, impressed me, and after Hans Moravec explained the REP loop to me
    I was forever going strong with Lisp.
    
    > or a factory
    
    That's not a good idea. I have very poor muscle coordination, can't
    write legibly, can't do sports at all, take ten times as long as anyone
    else to do a simple mechanical task in metal/wood shop in school and
    still the result is cruddy, need extra space on both sides of car when
    I'm driving because I can't judge distance between car and parket cars,
    break almost anything physical I try to work on, did I tell you about
    the disaster when I tried to do work on my car (tune-up, and lubricate
    the air-duct wire-in-sleeve control cables)?
    
    > a lot more brainpower goes into defining the problems that explicitly
    > than into the actual coding,
    
    Much of my work at Stanford was like that. Unfortunately there's no way
    to express that with buzzwords on a resume, so you're not aware of that
    from reading my resumes.
    
    > and once you've done that part -- Indians and Chinese can and will
    
    I'd be glad to design the software, farm it out to I&C, then check what
    comes back to make sure it does the job that was required. Do you know
    any such software-design jobs available now? I've never seen any such
    jobs advertised anywhere, ever in all the years since I started
    programming.
- 3
  - API 1.5.0 DownloadHi all,
    I am new to the Mac and am looking for a download of the
    jdk 1.5.0 api. I cannot find a tarball or zip file on the
    Sun site that I can download so I can use the reference when
    I am offline.
    
    Suggestions?
    
    Thanks,
    
    Bob
- 4
  - a simple java timerJust wondering, has anyone here ever used java.swing.timer if so, have you
    got any examples? i cant seem to find many on google :s
- 5
  - question about compiling java with textpadHow do i set a classpath in the javac? its not paying attention to the
    classpath I have set at the environment level. This is windows 2000.
    
    I go to configure->preferences->tools->compile java
    
    I see $file in the parameters. Not able to do this:
    
    -classpath <path> $file
    
    and i get the standard javac error where it lists the options.
- 6
  - Hibernate on delete cascadeI use Hibernate and I am not able to do cascade delete.
    
    After I create a project I have:
    
    select * from project;
    uid | name | shortdescription
    -----+------+-----------------
    1 | nc | NC Web application
    (1 row)
    
    After I subscribe to the project I have:
    
    select * from subscription;
    uid | account | project | role
    -----+---------+---------+------
    1 | 1 | 1 | 1
    (1 row)
    
    When I delete the project with a simple session.delete
    
    try {
    session.delete(project);
    session.flush();
    } catch (HibernateException e) {...
    
    the row is deleted in the table "project"
    but the row stays in table "subscription". Only the column entry "project" is set to null.
    
    select * from subscription;
    uid | account | project | role
    -----+---------+---------+------
    1 | 1 | | 1
    (1 row)
    
    I want the row to be deleted, how do I do that?
    
    My two tables one for Projects and one for Subscriptions
    
    <hibernate-mapping>
    
    <class name="org.cobra.persistence.Project" table="project">
    
    <id name="id" column="uid" type="long">
    <generator class="increment"/>
    </id>
    
    <property name="name">
    <column name="name" sql-type="char(32)" not-null="true"/>
    </property>
    
    <property name="shortDescription">
    <column name="shortDescription" sql-type="char(256)" not-null="true"/>
    </property>
    
    <set name="subscriptions" table="subscription" cascade="all-delete-orphan">
    <key column="project"/>
    <one-to-many class="org.cobra.persistence.Subscription"/>
    </set>
    
    <set name="subscriptionsRequested" table="subscriptionRequest" cascade="all-delete-orphan">
    <key column="project"/>
    <one-to-many class="org.cobra.persistence.SubscriptionRequest"/>
    </set>
    
    </class>
    
    </hibernate-mapping>
    
    <hibernate-mapping>
    
    <class name="org.cobra.persistence.Subscription" table="subscription">
    
    <id name="id" column="uid" type="long">
    <generator class="increment"/>
    </id>
    
    <many-to-one name="account" column="account" cascade="all" class="org.cobra.persistence.Account" />
    
    <many-to-one name="project" column="project" cascade="all" class="org.cobra.persistence.Project" />
    
    <many-to-one name="role" column="role" cascade="all" class="org.cobra.persistence.Role" />
    
    </class>
    
    </hibernate-mapping>
- 7
  - Returning value from deep recursionI have the following code
    
    ***********************************
    /**
    * Recurses through schema finding the first instance of the
    element name
    * @param schemaElement - current element being compared from
    schema
    * @param checkElement - element to be checked against i.e. the
    node selected in the gui
    * @return the element in schema which matches the checkElement
    */
    private Element findElementNameMatch(Element schemaElement, Element
    checkElement)
    {
    // Get list of children
    List listOfChildren = schemaElement.getChildren();
    
    // If element has children
    if(listOfChildren.size() != 0)
    {
    // Recurse through all elements under this one
    for(int x=0; x < listOfChildren.size(); x++)
    {
    // Get child element
    Element childElement = (Element) listOfChildren.get(x);
    
    if(childElement.getName() == checkElement.getName())
    {
    return(childElement);
    }
    findElementNameMatch(childElement,checkElement);
    }
    }
    
    return(null);
    }
    ***********************************
    
    The method is trying to find an element in an xml document that matches
    a given name.
    
    Can anyone give me tips on how to go about returning a value from deep
    recursion to the first recursion of that particular method, so it can
    return that value to the method that called it.
    
    And also quite importantly how to stop any recursions after a match has
    been found. EG a target element is found and returned, but how can i
    stop the recursion going on to check elements under this element.
    
    So far i have only achieved the two by creating a global variable and
    flag, the variable is initialised when the match is found, and flag is
    set to true so no more recursions are done afterwards.
- 8
  - model to xmlHi,
    
    We have "Objects" that relate to each other in a parent-child
    relationship. Also these objects can have references to ther objects
    that is not a parent. Let me give you all an example.
    
    I have the following parent-child relationship between objects,
    
    Object A=1
    |
    -------------
    | |
    Object B=1 Object C=1
    |
    -------------
    | |
    Object D=1 Object D=2
    
    Note: The number is the identity when we have more than one object of
    the same type.
    
    "Object A=1" is parent to child "Object B=1".
    
    We have the same relationship for "Object D=1". "Object A=1" is parent
    to "Object B=1" which is parent to "Object D=1". The path to "Object
    D=1" is "Object A=1,Object C=1,Object D=1".
    
    Also "Object B=1" can have a reference to "Object D=2". The
    "reference"-attribute in "Object B=1" has the following path,
    
    "Object A=1,Object C=1,Object D=2"
    
    My question is if there is a tool where I can graphically create my
    model ( see my nice one !!!) and from that generate an xml file ( or
    xmi).
    
    Requirements:
    * It is important that when I create "Object B=1" it must be possible
    for "Object B=1" to know that it's parent is
    "Object A=1". When the hirarchy grows the child at the end should know
    the whole path to itself.
    
    * It is also important that a reference to an Object D=2 is created as
    "Object A=1,Object C=1,Object D=2"
    
    Has anyone done something similar? Any open-source tools for this? All
    ideas/questions are welcome.
    
    BR
    
    //Mikael
- 9
  - [eclipse] export with referenced librariesHello,
    
    I am trying to export a project in jar format so that I can run it on
    different machines. . I got a NoClassDefFoundError exception because
    it requires referenced libraries (in this case, it is the MINA). Would
    anyone please tell me how to export with referenced libraries?
    
    Thanks
    
    -k
- 10
  - servlet and threadi am connecting to a servlet. i am passing some values from JSP to
    servlet. the servlet gets those values from JSP by
    request.getParameter(). then the servlet creates Threads as much as
    values gives to it.
    
    if the servlet is given 3 values from the JSP, then it would create 3
    threads to calculate.
    
    if the servlet is given 10 values from the JSP, then it would create 10
    threads to calculate.
    
    each Thread would return results to the JSP.
    
    PROBLEM :
    =========
    
    how does my JSP would get the results from the threads. JSP would
    refresh in 5 secs interval and would display the latest threads result.
- 11
  - Memory Leakage drawing Images from Stream - Minimum exampleOk folks
    
    I posted this a number of times ago,but never posted a minimum code
    example for people to look at.
    
    I was trying to load and draw images from a Mjpeg-Stream, reading from
    the stream in a different thread.
    
    This is the thread where the images are read by:
    
    public class Axis2420
    {
    
    private HttpURLConnection hurlconnection = null;
    private DataInputStream datainstream = null;
    private String serialNumber = null;
    private boolean connected = false;
    private Frame dummy = null;
    private Image image = null;
    private String MJpegStreamUrl = null;
    
    Runnable decodingThread = null;
    
    public void SetURL(String url)
    {
    MJpegStreamUrl = url;
    }
    
    public boolean Connect()
    {
    
    if(MJpegStreamUrl == null)
    {
    System.out.println("Error: Empty Camera URL String");
    return false;
    }
    
    try
    {
    
    URL streamurl = new URL(MJpegStreamUrl);
    hurlconnection = (HttpURLConnection)streamurl.openConnection();
    hurlconnection.setReadTimeout(10000);
    //hurlconnection.setUseCaches(false);
    
    InputStream instream = hurlconnection.getInputStream();
    
    connected = true;
    
    BufferedInputStream bis = new BufferedInputStream(instream);
    datainstream = new DataInputStream(bis);
    
    } catch(IOException e)
    {
    System.out.println("Fehler");
    
    try
    {
    hurlconnection.disconnect();
    Thread.sleep(60);
    }
    catch(InterruptedException ie)
    {
    hurlconnection.disconnect();
    Connect();
    }
    catch(Exception ex)
    {return false; }
    
    System.out.println(e.getMessage());
    
    return false;
    }
    
    return true;
    }
    
    //run method of the reading thread
    public void run()
    {
    //test if still connected
    if(!connected)
    return;
    
    try
    {
    //decode stream
    if(connected)
    {
    Image i = null;
    //ImageIO.setUseCache(false);
    long before,after;
    
    while(!Thread.currentThread().isInterrupted())
    {
    
    i = null;
    
    String header;
    int k = 0;
    
    do
    {
    header = datainstream.readLine();
    //System.out.println("Zeile: " +header);
    }
    while(++k < 3);
    
    int j = (new Integer(header.substring("Content-Length:
    ".length()))).intValue();
    
    datainstream.readByte();
    datainstream.readByte();
    // datainstream.readLine();
    imageJPG = new byte[j];
    datainstream.readFully(imageJPG, 0, j);
    byte tail[] = new byte[4];
    datainstream.readFully(tail,0,4);
    
    i =
    Toolkit.getDefaultToolkit().createImage(imageJPG,0,imageJPG.length);
    
    image = i;
    i = null;
    
    fireChange(); //calls the stateChanged() method in
    the class 'MainProgram' below
    
    image = null;
    i = null;
    
    Thread.currentThread().sleep(10);
    }
    }
    }
    catch(Exception ex)
    {
    ex.printStackTrace();
    }
    finally
    {
    
    try {
    datainstream.close();
    } catch(Exception ex)
    {
    ex.printStackTrace();
    }
    }
    }
    
    //for the listening objects so they can fetch the latest image
    public Image getLatestImage()
    {
    return image;
    }
    
    <....>
    
    }
    
    Once a new image has arrived, the fireChange() method calls this method
    on the MainProgram class:
    
    class MainProgram
    extends JFrame
    implements Runnable,ChangeListener
    {
    public static String WINDOW_TITLE = "BINO GESTENERKENNUNG";
    public static int WINDOW_WIDTH = 640;
    public static int WINDOW_HEIGHT = 480;
    
    public static final int CAMERA_LEFT = 0;
    public static final int CAMERA_RIGHT = 1;
    
    //public static final String leftCameraURL =
    "http://192.168.1.51/axis-cgi/mjpg/video.cgi?resolution=704x576&compression=25&clock=0&date=1&fps=10";
    
    //public static final String rightCameraURL =
    "http://192.168.1.51/axis-cgi/mjpg/video.cgi?resolution=704x576&compression=25&clock=0&date=1&fps=10";
    
    public static final String leftCameraURL =
    "http://192.168.1.51/axis-cgi/mjpg/video.cgi?resolution=352x288&compression=70&date=1&fps=5";
    
    public static final String rightCameraURL =
    "http://192.168.1.51/axis-cgi/mjpg/video.cgi?resolution=352x288&compression=100&date=1&fps=5";
    
    Image currentLeftImage;
    Image currentRightImage;
    
    Graphics leftImageGraphics;
    Graphics rightImageGraphics;
    Graphics leftCameraGraphics;
    Graphics rightCameraGraphics;
    byte[] currentLeftImageJPG;
    byte[] currentRightImageJPG;
    
    BufferedImage testImage;
    
    Axis2420 leftCamera = null;
    Axis2420 rightCamera = null;
    
    CameraCanvas leftCameraCanvas = null;
    CameraCanvas rightCameraCanvas = null;
    
    Runnable drawThread = null;
    boolean readyToDraw = false;
    boolean newImage = false;
    
    long frameRateLeft = 0,frameRateRight = 0;
    long frameTimesLeft[],frameTimesRight[];
    
    //vPointerDetector leftImagePointer;
    //vPointerDetector rightImagePointer;
    vPointerDetector imagePointer;
    
    boolean updateLeftImage,updateRightImage;
    
    <.....lots of meaningless stuff.......>
    
    public void stateChanged(ChangeEvent e)
    {
    
    currentRightImage = rightCamera.getLatestImage();
    
    rightCameraCanvas.SetUpdate(true); //otherwise paintComponent()
    of the JCanvas won't draw the image
    rightCameraCanvas.SetImage(currentRightImage);
    rightCameraCanvas.repaint();
    currentRightImage = null;
    currentRightImageJPG = null;
    }
    }
    
    }
    
    } //end of MainProgram class
    
    Basically, all the stateChange method does is getting the image from the
    image-reading thread ('rightCamera' of type Axis2420) after
    rightCamera called fireChange(). The image is passed to an object of the
    class CameraCanvas which derieves from JCanvas. After that, we cast
    repaint() on the CameraCanvas (rightCameraCanvas.repaint() ).
    
    This is the CameraCanvas that is responsible for drawing:
    
    public class CameraCanvas extends JPanel
    {
    
    private Image image = null;
    boolean drawNext = false;
    boolean readyForNext;
    
    public void paintComponent(Graphics g)
    {
    if(drawNext == true)
    {
    
    readyForNext =
    g.drawImage(image,0,0,getSize().width,getSize().height,this);
    //image.flush();
    image = null;
    //g.dispose();
    
    //imageBuffered.flush();
    drawNext = false;
    }
    
    }
    
    //indicates that there is a new image
    public void SetUpdate(boolean up)
    {
    drawNext = up;
    }
    
    //passes a new image to the Canvas
    public void SetImage(Image i)
    {
    image = i;
    }
    }
    
    The program draws the stream correctly and is smooth like butter.
    However, there is a HUGE memory leak somewhere that raises the memory
    usage by about 40MBytes per second. If I remove the call to
    
    readyForNext = g.drawImage(image,0,0,getSize().width,getSize().height,this);
    
    in the CameraCanvas thread, the leak will go down to about 40 kbyte /
    second. If I leave it in and post a System.gc() call afterwards, the
    leak will also go down.
    
    I think that I'm somewhat polling the AWTEvent thread which lots of
    copies of images waiting to be drawn. Also using
    Toolkit.getDefaultToolkit().createImage(imageJPG,0,imageJPG.length);
    
    spawns abouth 4 ImageFetcher threads which I think are the reason for
    the small memory leak.
    
    Now the question: What can I do about it?
    
    It seems that the garbage collection isn't called after drawing an image
    and casting it manually via System.gc() slows everything down a lot.
    Using ImageIO.read)() instead of the Toolkit seems to remove the small
    leak, but not the big one for drawing. And it tends to be slower since
    it's blocking and keeping the Axis2420 thread from reading from the stream.
    
    My thesis is due soon, so pleease have a look at it again.!!
    Thanks in advance!!!
- 12
  - Reflection with Java and Oracle 10gHi everyone,
    
    We have change oracle 8i to oracle 10g, now we have problems with the
    reflection in JAVA.
    I've got an IllegalAccessException:
    
    Object value;
    value = infoResultSetAndData.getResultSetMethodGet().invoke(rs, new
    Object[] {new Integer(infoResultSetAndData.getResultSetIndice())});
    
    thanks for suggestions,
    
    fourmi
- 13
  - Making a Screensaver with JavaI like to make a screensaver with java. Can anyone help me?
- 14
  - Null pointer exception while trying to repaint the component that displays a buffered image when the component is scrolled using scroll barI am trying to repaint a component that displays a buffered image when
    the component is scrolled. I get the following error:
    [java] java.lang.NullPointerException: NullSD does not handle
    this operation
    [java] at sun.java2d.NullSurfaceData.getRaster(Unknown Source)
    [java] at sun.java2d.loops.OpaqueCopyAnyToArgb.Blit(Unknown
    Source)
    [java] at sun.java2d.loops.GraphicsPrimitive.convertFrom(Unknown
    Source)
    [java] at sun.java2d.loops.MaskBlit$General.MaskBlit(Unknown
    Source)
    [java] at sun.java2d.loops.Blit$GeneralMaskBlit.Blit(Unknown
    Source)
    [java] at sun.java2d.pipe.AlphaPaintPipe.renderPathTile(Unknown
    Source)
    [java] at sun.java2d.pipe.SpanShapeRenderer
    $Composite.renderBox(Unknown Source)
    [java] at sun.java2d.pipe.SpanShapeRenderer.spanClipLoop(Unknown
    Source)
    [java] at sun.java2d.pipe.SpanShapeRenderer.renderSpans(Unknown
    Source)
    [java] at sun.java2d.pipe.SpanShapeRenderer.renderPath(Unknown
    Source)
    [java] at sun.java2d.pipe.SpanShapeRenderer.fill(Unknown Source)
    [java] at sun.java2d.pipe.ValidatePipe.fill(Unknown Source)
    [java] at sun.java2d.SunGraphics2D.fill(Unknown Source)
    [java] at
    i3dea.ditto.DocumentImageDisplay.paintZone(DocumentImageDisplay.java:
    256)
    [java] at
    i3dea.ditto.DocumentImageDisplay.paintComponent(DocumentImageDisplay.java:
    467)
    [java] at javax.swing.JComponent.paint(Unknown Source)
    [java] at javax.swing.JComponent.paintChildren(Unknown Source)
    [java] at javax.swing.JComponent.paint(Unknown Source)
    [java] at javax.swing.JViewport.paint(Unknown Source)
    [java] at javax.swing.JComponent.paintChildren(Unknown Source)
    [java] at javax.swing.JComponent.paint(Unknown Source)
    [java] at javax.swing.JComponent.paintWithOffscreenBuffer(Unknown
    Source)
    [java] at javax.swing.JComponent.paintDoubleBuffered(Unknown
    Source)
    [java] at javax.swing.JComponent._paintImmediately(Unknown
    Source)
    [java] at javax.swing.JComponent.paintImmediately(Unknown Source)
    [java] at javax.swing.RepaintManager.paintDirtyRegions(Unknown
    Source)
    [java] at javax.swing.SystemEventQueueUtilities
    $ComponentWorkRequest.run(Unknown Source)
    [java] at java.awt.event.InvocationEvent.dispatch(Unknown Source)
    [java] at java.awt.EventQueue.dispatchEvent(Unknown Source)
    [java] at
    java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
    [java] at
    java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    [java] at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    [java] at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    [java] at java.awt.EventDispatchThread.run(Unknown Source)
    
    Thanks
    Mangai
- 15
  - java.lang.NullPointerException at com.sun.kvem.midp.MIDP.run(MIDP.java:651)Hi Friends,
    
    Does any one has any idea about the following StackTrace. I am using
    CLDC1.1 and MIDP2.0 with Sun Java Studio Mobility. Any help will be
    highly appreciated.
    
    java.lang.NullPointerException
    at com.sun.kvem.midp.MIDP.run(MIDP.java:651)
    at
    com.sun.kvem.environment.EmulatorInvoker.runEmulatorImpl(EmulatorInvoker.java:116)
    at
    com.sun.kvem.environment.EmulatorInvoker.runEmulatorSameVM(EmulatorInvoker.java:105)
    at
    com.sun.kvem.environment.EmulatorInvoker.runEmulator(EmulatorInvoker.java:63)
    at com.sun.kvem.environment.ProfileEnvironment$KVMThread.runEmulator
    (ProfileEnvironment.java:240)
    at
    com.sun.kvem.environment.ProfileEnvironment$KVMThread.run(ProfileEnvironment.java:262)
    
    Greetings,