java-programmer >>Problems with tomcat

Problems with tomcat

Index ‹ java-programmer

Previous
- 3
  - cannot run javac commandHi,
    
    Complete newbie to Java.
    
    I installed JDK 5.0 Update 9 with NetBeans 5.5 and started the tutorial.
    No problems with using Netbeans--but can't compile the hello world prog
    using command line.
    
    I also want to write the program from scratch using text editor.
    
    That's done but when I go to javac helloworldapp.java as system does
    not recognize command "javac"
    
    Error message: Microsoft Windows XP [Version 5.1.2600]
    (C) Copyright 1985-2001 Microsoft Corp.
    
    C:\>javac
    'javac' is not recognized as an internal or external command,
    operable program or batch file.
    
    C:\>
    
    Here is my Class path: .;C:\Program
    Files\Java\jre1.5.0_06\lib\ext\QTJava.zip
    
    QTJAVA C:\Program Files\Java\jre1.5.0_06\lib\ext\QTJava.zip
    
    I'm sure I'm doing something wrong here....
    
    Any help?
    
    Thanks!
    --
- 3
  - ports/java cleanup/re-org (was: freebsd eclipse plugins & mailingOn Aug 25, 2005, at 10:00 PM, Greg Lewis wrote:
    
    > and the fact that the devel category is already huge.
    
    Devel is ripe for splitting ala the x11-* categories. And I suspect a
    not insubstantial portion of devel could be moved elsewhere (e.g.
    devel/mime -> mail/mime).
    
    And this whole thread should be moved to the ports list. Please note
    the reply-to.
    
    --lyndon
    
    _______________________________________________
    email***@***.com mailing list
    http://lists.freebsd.org/mailman/listinfo/freebsd-java
    To unsubscribe, send any mail to "email***@***.com"
- 3
  - OutOfMemoryError problemHi,
    
    I am a user of cruisecontrol ( continuous integration server). As long
    as I have used it I have had problems with
    java.lang.OutOfMemoryError's. I have gotten numerous ideas on how to
    handle it. Some
    resonable and some more unrealistic. However lately I dicided that I
    need to dig deeper into this.
    I use two ways to perform build and test. Both ways use the same 'ant'
    and the same 'build file'.
    The difference is in how the build is triggered.
    
    Shell script
    =========
    
    Here I use a shell script to start ant.
    java -Xms512M -Xmx756M -classpath .......
    
    Cruisecontrol
    ==========
    
    Here I start cruisecontrol ( a java program) that starts ant.
    I set Xms and Xmx for cruisecontrol as well as ant.
    
    When I execute the shell script the 'junit' and 'junitreport' tasks
    execute nicely.
    
    On the other hand when I execute 'cruisecontrol' I get a
    java.lang.OutOfMemoryError when I execute the 'junit-report'.
    
    Trace:
    --------
    BUILD FAILED
    java.lang.OutOfMemoryError
    at
    org.apache.tools.ant.Project.executeSortedTargets(Project.java:1225)
    at
    org.apache.tools.ant.Project.executeTarget(Project.java:1185)
    at
    
    org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecut
    or.java:40)
    at
    org.apache.tools.ant.Project.executeTargets(Project.java:1068)
    at org.apache.tools.ant.Main.runBuild(Main.java:668)
    at org.apache.tools.ant.Main.startAnt(Main.java:187)
    at org.apache.tools.ant.launch.Launcher.run(Launcher.java:246)
    at org.apache.tools.ant.launch.Launcher.main(Launcher.java:67)
    Caused by: java.lang.OutOfMemoryError
    --- Nested Exception ---
    java.lang.OutOfMemoryError
    
    I did some investigation in ant ( source code ) and found out the each
    junit test suite result ( xml-file) is merged into one big xml file.
    
    There are two steps in the code. Step 1 works ok! Step 2 is failing
    siince the big merged file is not complete. Could it be something with
    the jvm?
    
    All hints are welcome.
    
    cheers,
    
    //mikael
    
    Step 1 - creating the dom document
    -------------------------------------------
    
    protected Element createDocument() {
    // create the dom tree
    DocumentBuilder builder = getDocumentBuilder();
    Document doc = builder.newDocument();
    Element rootElement = doc.createElement(TESTSUITES);
    doc.appendChild(rootElement);
    
    generatedId = 0;
    
    // get all files and add them to the document
    File[] files = getFiles();
    for (int i = 0; i < files.length; i++) {
    File file = files[i];
    try {
    log("Parsing file: '" + file + "'",
    Project.MSG_VERBOSE);
    if(file.length()>0) {
    Document testsuiteDoc
    =
    builder.parse(FileUtils.getFileUtils().toURI(files[i].getAbsolutePath()));
    Element elem = testsuiteDoc.getDocumentElement();
    // make sure that this is REALLY a testsuite.
    if (TESTSUITE.equals(elem.getNodeName())) {
    addTestSuite(rootElement, elem);
    generatedId++;
    } else {
    //wrong root element name
    // issue a warning.
    log("the file " + file
    + WARNING_INVALID_ROOT_ELEMENT,
    Project.MSG_WARN);
    }
    } else {
    log("the file " + file
    + WARNING_EMPTY_FILE,
    Project.MSG_WARN);
    }
    } catch (SAXException e) {
    // a testcase might have failed and write a zero-length
    document,
    // It has already failed, but hey.... mm. just put a
    warning
    log("The file " + file + WARNING_IS_POSSIBLY_CORRUPTED,
    Project.MSG_WARN);
    log(StringUtils.getStackTrace(e), Project.MSG_DEBUG);
    } catch (IOException e) {
    log("Error while accessing file " + file + ": "
    + e.getMessage(), Project.MSG_ERR);
    }
    }
    return rootElement;
    }
    
    Step 2 - write the DOM Tree to file
    ----------------------------------------
    
    protected void writeDOMTree(Document doc, File file) throws IOException
    {
    OutputStream out = null;
    PrintWriter wri = null;
    try {
    out = new BufferedOutputStream(new FileOutputStream(file));
    wri = new PrintWriter(new OutputStreamWriter(out, "UTF8"));
    wri.write("<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\n");
    (new DOMElementWriter()).write(doc.getDocumentElement(),
    wri, 0, " ");
    wri.flush();
    // writers do not throw exceptions, so check for them.
    if (wri.checkError()) {
    throw new IOException("Error while writing DOM
    content");
    }
    } finally {
    FileUtils.close(wri);
    FileUtils.close(out);
    }
    }
- 8
  - Open Source Distributive Cache solutionHi,
    
    I am looking for an open source's distributive cache solution. One that
    can be used for a clustered weblogic servers environment, the cache has
    to be read and write, and the cache itself need to be fail-safe.
    
    Anyone has some recommandations?
    
    Thanks,
    
    Edmond
- 9
  - Little problem with ant install taskHi,
    
    I found out that i can use ant for installing my web application.
    great, I have copied some code from an example and added the taskdef's
    to the top of my build.xml.
    Then I copied the catalina-ant.jar into my java classpath.
    
    But when I run it, I get :
    "A class needed by class org.apache.catalina.ant.InstallTask cannot be
    found: org/apache/tools/ant/Task"
    
    I looked into the catalina-ant.jar and could not find a Task class
    indeed, but then, where is it...?
    
    Taskdef:
    <taskdef name="install"
    classname="org.apache.catalina.ant.InstallTask" />
    <taskdef name="remove"
    classname="org.apache.catalina.ant.RemoveTask" />
    Target:
    <target name="install" depends="war" description="Install servlet
    on tomcat.kochan.de">
    <install url="${tomcat.url}" username="${manager.username}"
    password="${manager.password}" path="${app.path}"
    war="jar:file:/${war.dir}/${project}.war!/" />
    <sleep seconds="2"/>
    </target>
    
    Thanks for help!
    Werner
- 9
  - java.util.zip not handling Unicode filenamesI have a zip file that contains files with Asian filenames.
    java.util.zip.ZipFile opens it, but the filenames are garbled. Is there any
    way to handle filenames that contain unicode characters?
- 12
  - Registering Connector/J driverHi. I have
    - mySQL 1.4
    - Connector/J 3.0.15
    
    I want to use Java to query mySQL database via Connector/J.
    
    Connector/J documentation at
    http://dev.mysql.com/doc/connector/j/en/index.html instructs to
    compile and run the following Java code to register the Connector/J
    driver:
    
    import java.sql.Connection;
    import java.sql.DriverManager;
    import java.sql.SQLException;
    
    // Notice, do not import com.mysql.jdbc.*
    // or you will have problems!
    
    public class LoadDriver {
    public static void main(String[] args) {
    try {
    // The newInstance() call is a work around for some
    // broken Java implementations
    
    Class.forName("com.mysql.jdbc.Driver").newInstance();
    } catch (Exception ex) {
    // handle the error
    }
    }
    }
    // Error:
    // SQLJConnectorRegister1failed.java:8:
    // class LoadDriver is public, should be declared in a file named
    // LoadDriver.java
    
    Where should I have this LoadDriver class/java file? It doesn't come
    with any of the packages I have (java.sql.* or connector/J driver
    classes). Hence I can't "supply a class that implements Driver
    interface" which would I gather register the driver. I have set the
    classpath to the driver's jar, so it should find that class.
    
    *
    And then SQL queries would be possible. That would be an achievement
    as such, never loaded/registered a driver in my life, or programmed
    much anyway.
    
    Appreciate any help over this.
    Best, Harri S
    Finland
    language technologist
- 12
  - stringtokenizer that traps ASCII linebreaksDear all,
    
    How do i define a stringtokenizer that traps chr13, chr10 combinations?
    
    tia
    WS
- 12
  - bypassing IISHi
    
    We have an architecture where users log in to their
    "windows" pcs using Microsoft Active Directory
    and requests are then sent as follows:
    
    client -> IIS -> Tomcat
    
    An isapi redirector resides at IIS which forwards the request to
    Tomcat.
    
    isapi redirect would appear to populate the HTTP header with
    the user's credentials.
    
    My question is: how can we avoid the overhead of IIS
    and send requests directly to Tomcat for authentication against the
    ldap server as before.
    
    (The issue I see is how to populate the HTTP header with the
    user details?)
    
    Regards
- 12
  - use my JSP custom tag on click of buttonI have written a custom tag in a jsp
    
    <test:attribs attribNames="<%=aenum%>">
    <li> <b><%=aenum.nextElement()%></b>
    </test:attribs>
    
    It lists the request attributes.
    
    Now i want the to list the same on click of a button or say on clicking
    on an image( or consider for some specified event of a HTML component)
    
    Can i use the custom tag for the same and if yes how?
    
    Regards,
- 12
  - what's wrong with my component? i make a new component which is a dragable icon here is my piece of
    code
    
    //class: DragAbleComponent.the father of my component
    
    import java.awt.Graphics;
    import java.awt.event.FocusEvent;
    import java.awt.event.FocusListener;
    import java.awt.event.MouseEvent;
    import java.awt.event.MouseListener;
    import java.awt.event.MouseMotionListener;
    
    import javax.accessibility.Accessible;
    import javax.swing.JComponent;
    
    public abstract class DragAbleComponent extends JComponent implements
    MouseListener,
    FocusListener, Accessible ,MouseMotionListener{
    private int X;
    
    private int Y;
    
    /**
    *
    */
    private static final long serialVersionUID = 1L;
    
    public void mouseClicked(MouseEvent e) {
    this.requestFocusInWindow();
    
    }
    
    public void mouseEntered(MouseEvent e) {}
    
    public void mouseExited(MouseEvent e) {}
    
    public void mousePressed(MouseEvent e) {}
    
    public void mouseReleased(MouseEvent e) {}
    
    public void focusGained(FocusEvent e) {
    this.repaint();}
    
    public void focusLost(FocusEvent e) {
    this.repaint();}
    
    protected abstract void paintComponent(Graphics graphics);
    
    public int getX() {
    return X;
    }
    
    public void setX(int x) {
    X = x;
    }
    
    public int getY() {
    return Y;
    }
    
    public void setY(int y) {
    Y = y;
    }
    }
    
    //class:DragableIcon the component
    
    import java.awt.Color;
    import java.awt.Graphics;
    import java.awt.Image;
    import java.awt.event.InputEvent;
    import java.awt.event.MouseEvent;
    
    import javax.swing.Action;
    import javax.swing.ActionMap;
    import javax.swing.InputMap;
    import javax.swing.JComponent;
    import javax.swing.KeyStroke;
    import javax.swing.TransferHandler;
    
    public class DragableIcon extends DragAbleComponent {
    
    private Image image;
    
    private MouseEvent firstMouseEvent = null;
    
    private static boolean installKeyBordMapings = true;
    /**
    *
    */
    private static final long serialVersionUID = 1L;
    
    public DragableIcon(Image image) {
    super();
    this.image = image;
    this.setFocusable(true);
    this.addMouseListener(this);
    this.addFocusListener(this);
    this.addMouseMotionListener(this);
    this.initKeyBordMaping();
    
    }
    
    private void initKeyBordMaping(){
    if (installKeyBordMapings) {
    InputMap imap = this.getInputMap();
    // imap.put(KeyStroke.getKeyStroke("ctrl X"),
    //
    TransferHandler.getCutAction().getValue(Action.NAME));
    imap.put(KeyStroke.getKeyStroke("ctrl C"),
    
    TransferHandler.getCopyAction().getValue(Action.NAME));
    imap.put(KeyStroke.getKeyStroke("ctrl V"),
    
    TransferHandler.getPasteAction().getValue(Action.NAME));
    }
    
    ActionMap map = this.getActionMap();
    //
    map.put(TransferHandler.getCutAction().getValue(Action.NAME),
    // TransferHandler.getCutAction());
    map.put(TransferHandler.getCopyAction().getValue(Action.NAME),
    TransferHandler.getCopyAction());
    
    map.put(TransferHandler.getPasteAction().getValue(Action.NAME),
    TransferHandler.getPasteAction());
    }
    @Override
    protected void paintComponent(Graphics graphics) {
    Graphics g = graphics.create();
    
    //Draw in our entire space, even if isOpaque is false.
    g.setColor(Color.WHITE);
    g.fillRect(0, 0, image == null ? 125 : image.getWidth(this),
    image == null ? 125 : image.getHeight(this));
    
    if (image != null) {
    //Draw image at its natural size of 125x125.
    g.drawImage(image, 0, 0, this);
    }
    
    //Add a border, red if picture currently has focus
    if (isFocusOwner()) {
    g.setColor(Color.RED);
    } else {
    g.setColor(Color.BLACK);
    }
    g.drawRect(0, 0, image == null ? 125 : image.getWidth(this),
    image == null ? 125 : image.getHeight(this));
    // g.drawImage(image, 0, 0, this);
    g.dispose();
    
    }
    
    public void mouseDragged(MouseEvent e) {
    
    //Don't bother to drag if the component displays no image.
    if (image == null) return;
    
    if (firstMouseEvent != null) {
    e.consume();
    
    //If they are holding down the control key, COPY rather
    than MOVE
    int ctrlMask = InputEvent.CTRL_DOWN_MASK;
    int action = ((e.getModifiersEx() & ctrlMask) == ctrlMask)
    ?
    TransferHandler.COPY : TransferHandler.MOVE;
    
    int dx = Math.abs(e.getX() - firstMouseEvent.getX());
    int dy = Math.abs(e.getY() - firstMouseEvent.getY());
    //Arbitrarily define a 5-pixel shift as the
    //official beginning of a drag.
    if (dx > 5 || dy > 5) {
    //This is a drag, not a click.
    JComponent c = (JComponent)e.getSource();
    TransferHandler handler = c.getTransferHandler();
    //Tell the transfer handler to initiate the drag.
    handler.exportAsDrag(c, firstMouseEvent, action);
    firstMouseEvent = null;
    }
    }
    
    }
    
    public void mouseMoved(MouseEvent e) {}
    
    public void mousePressed(MouseEvent e) {
    //Don't bother to drag if there is no image.
    if (image == null) return;
    
    firstMouseEvent = e;
    e.consume();
    }
    
    public void mouseReleased(MouseEvent e) {
    firstMouseEvent = null;
    }
    
    public static boolean isInstallKeyBordMapings() {
    return installKeyBordMapings;
    }
    
    public static void setInstallKeyBordMapings(boolean
    installKeyBordMapings) {
    DragableIcon.installKeyBordMapings = installKeyBordMapings;
    }
    
    public Image getImage() {
    return image;
    }
    
    public void setImage(Image image) {
    this.image = image;
    }
    }
    
    //and here is my pane
    
    import java.awt.BorderLayout;
    import java.awt.event.ItemEvent;
    import java.awt.event.ItemListener;
    
    import javax.swing.ImageIcon;
    import javax.swing.JPanel;
    import javax.swing.JToolBar;
    
    import cn.com.ynld.bms.applet.gui.handler.IconTransferHandler;
    import cn.com.ynld.bms.applet.service.TransfAble;
    import cn.com.ynld.bms.applet.service.UpdateAble;
    
    public class ElectronicPane extends JPanel
    implements ItemListener,UpdateAble{
    private UpdateAble updateAble = null;
    
    private ScrollAbleImage image;
    private JToolBar toolBar;
    private IconTransferHandler handler;
    /**
    *
    */
    private static final long serialVersionUID = 1L;
    
    public ElectronicPane(){
    
    super(new BorderLayout());
    handler = new IconTransferHandler();
    this.creatToolBar();
    this.add(this.toolBar);
    this.setTransferHandler(handler);
    
    }
    
    public void itemStateChanged(ItemEvent e) {}
    
    public void addTransferAble(String key, TransfAble transferAble) {
    // TODO
    
    }
    
    public TransfAble getTransferAble(String key) {
    // TODO
    return null;
    }
    
    public void removeTransferAble(String key) {
    this.updateAble.removeTransferAble(key);
    
    }
    
    public void update(UpdateAble updateAble) {
    this.updateAble = updateAble;
    this.init();
    
    }
    
    private void init(){
    this.image = new ScrollAbleImage();
    this.image.update(updateAble);
    this.add(image,BorderLayout.CENTER);
    this.repaint();
    //this.image.repaint();
    }
    
    private void creatToolBar(){
    
    this.toolBar = new JToolBar();
    
    DragableIcon alarm = new
    DragableIcon(createImageIcon("/root/Desktop/drawing/png-0003.png",
    "alarm").getImage());
    alarm.setTransferHandler(handler);
    
    DragableIcon damage = new
    DragableIcon(createImageIcon("/root/Desktop/drawing/png-0007.png",
    "device").getImage());
    alarm.setTransferHandler(handler);
    this.toolBar.add(alarm);
    this.toolBar.addSeparator();
    this.toolBar.add(damage);
    this.toolBar.setFloatable(false);
    
    }
    
    /** Returns an ImageIcon, or null if the path was invalid. */
    protected static ImageIcon createImageIcon(String path,
    String description) {
    // java.net.URL imageURL =
    DragPictureDemo.class.getResource(path);
    
    if (path == null) {
    System.err.println("Resource not found: "
    + path);
    return null;
    } else {
    return new ImageIcon(path, description);
    }
    }
    
    }
    
    the problem is i add DragableIcons to my toolbar but only the first
    icon can be seen!!!!
    what's wrong
    thanks for any help!
- 13
  - KeyRelease Event affects next Internal FrameHi,
    I am working on an MDI application using JInternalFrames. I have
    forms to fill that have the 'Next', 'Back' and 'Cancel' buttons. I am
    assigning key presses (Enter, Alt+left and Esc respectively) through
    KeyRelease event. In addition, the 'Next' button is assigned as the
    default button using
    this.getRootPane().setDefaultButton(btnOK). However, I find that when
    I run the program and press the Enter key, after accepting the enter
    and processing the button action, it loads the next JInternalFrame and
    appears to call the KeyRelease event for this form too. Since I have
    entries that must be filled, this raises errors that entries are not
    filled.
    Can anyone tell me what I am doing wrong.
    Thanks in advance,
    Arun Kumar Srinivasan
- 14
  - XML Validation with JavaHi
    
    For several days I've been trying to validate a very simple XML-Document
    against an XML Schema - so far without success. I've tried several
    approaches, using libraries like Xerces, JAXP and an Oracle-library, but
    none of those worked the way for example XML Spy works.
    
    Here is my Schema:
    
    <?xml version="1.0" encoding="UTF-8"?>
    <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:element name="root"/>
    </xsd:schema>
    
    This is the (invalid) XML-File that references the schema: <?xml
    version="1.0" encoding="UTF-8"?> <root
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation='test.xsd'> <a></a> </root>
    This is my first try to validate the Document against the schema:
    
    try { DOMParser parser = new DOMParser();
    parser.setFeature("http://xml.org/sax/features/validation",true);
    parser.setFeature("http://apache.org/xml/features/validation/schema",true);
    parser.setFeature("http://apache.org/xml/features/validation/schema-full-che
    cking",true); parser.parse("C:\\test.xml"); }
    catch(Exception ex) { ex.printStackTrace(); }
    
    This runs without problems, however, it doesn't report a validation-error.
    
    My second try:
    
    try { SAXParserFactory parserFct =
    SAXParserFactory.newInstance(); parserFct.setValidating(true);
    parserFct.setFeature("http://xml.org/sax/features/validation", true);
    parserFct.setFeature("http://apache.org/xml/features/validation/schema",
    true);
    parserFct.setFeature("http://apache.org/xml/features/validation/schema-full-
    checking",true); javax.xml.parsers.SAXParser parser =
    parserFct.newSAXParser(); parser.parse("C:\\test.xml", new
    MyHandlerBase()); } catch(Exception ex)
    { ex.printStackTrace(); }
    This is the Errorhandler I used:
    
    class MeinErrorHandler implements ErrorHandler{ boolean b = false;
    public void warning(SAXParseException e) throws SAXException {
    System.out.println("WARNUNG: " + e); b = true; } public void
    error(SAXParseException e) throws SAXException {
    System.out.println("FEHLER: " + e); b = true; } public void
    fatalError(SAXParseException e) throws SAXException {
    System.out.println("LEIDER, LEIDER, AUS: " + e); } public boolean
    warninghappened(){ return b; }}
    
    Again, no validation-error.
    
    My third try:
    
    InputSource is = null; DOMParser parser = new DOMParser();
    Document doc = null; try {
    parser.setFeature("http://xml.org/sax/features/validation",true);
    parser.setFeature("http://apache.org/xml/features/validation/schema",true);
    parser.setFeature("http://apache.org/xml/features/validation/schema-full-che
    cking",true);
    parser.setProperty("http://apache.org/xml/properties/schema/external-noNames
    paceSchemaLocation", "C:\\test.xsd" ); is = new
    InputSource(new FileReader("C:\\test.xml"));
    parser.parse(is); } catch(Exception ex)
    { ex.printStackTrace(); }
    
    Again, no validation-error.
    
    My fourth try involved the oracle.xml.parser.schema and
    oracle.xml.parser.v2-packages.
    Here is the code:
    
    public void process(String xsdURI, String xmlURI) throws Exception
    {
    XSDBuilder builder = new XSDBuilder();
    URL url = createURL(xsdURI);
    // Build XML Schema Object
    XMLSchema schemadoc = (XMLSchema) builder.build(url);
    DOMParser dp = new DOMParser();
    url = createURL(xmlURI);
    // Set Schema Object for Validation
    dp.setXMLSchema(schemadoc);
    dp.setValidationMode(XMLParser.SCHEMA_VALIDATION);
    dp.setPreserveWhitespace(true);
    dp.setErrorStream(System.out);
    try
    {
    System.out.println("Parsing " + xmlURI);
    dp.parse(url);
    System.out.println("The input file <" + xmlURI + "> parsed
    without errors");
    }
    catch (XMLParseException pe)
    {
    System.out.println("Parser Exception: " + pe.getMessage());
    }
    catch (Exception e)
    {
    System.out.println("NonParserException: " + e.getMessage());
    }
    }
    
    This worked fine with the test.xml-Document, however, when I tried to
    validate a more complex document which used keys and key-references, it
    couldn't validate the Document although XML-Spy had no problem with it.
    
    Am I missing something here? Does anybody know those problems and has a
    solution for it, or perhaps a sample-code that works? Any help would be
    greatly appreciated.
    
    Thanks in advance
    Mathias Winklhofer
- 14
  - Reading only numbers from a filehi all
    
    i need a code for reading only numbers from file and not the
    letters.
    for ex if i have emp name and salary i have to reda only salary.
- 15
  - POSSIBLE SECURITY PROBLEM in Java 5!This happened accidentally, but an attacker might use this
    intentionally in a hostile applet to perpetrate a denial of service
    attack.
    
    I had a Java app compile and run that generated ~200 threads accessing
    the network. It suddenly stopped functioning; it hadn't hung -- the UI
    still worked -- but the network activity dropped to zero and it
    wouldn't do anything. (Picture a Web browser that works, except every
    attempt to go to a page produces a timeout or the browser just spins.
    Sort of like that: the UI is working but the backend isn't.)
    
    Naturally, suspecting a bug, I exited and went to rerun the app, this
    time attaching a debugger process. Failed. Eclipse showed "Launching
    (83%)..." and stuck there. Details showed "searching for free socket"
    or some such.
    
    At this point I discovered that almost every other network using app on
    the system had locked up. Shareaza, MSN messenger, etc. -- Firefox was
    the only survivor, and it would not function (see above description of
    semi-functional Web browser; this was Firefox after the accident).
    
    Task Manager showed two Java tasks, one with over 100 threads;
    presumably the app that was supposed to have exited. I repeatedly
    attacked it with "End Process" and "End Process Tree"; no effect.
    Eclipse, when exited, likewise remained as a headless zombie: no
    visible UI but still an Eclipse process and a Java task with a couple
    of threads. Neither could be killed.
    
    After over half an hour, none of the tasks had exited that had been
    told in various increasingly imperative ways to terminate, and the
    network remained unusable. I concluded I had to reboot.
    
    To top it off, a clean reboot wasn't possible -- the system would close
    a couple apps then just sit there. I had to power-cycle the fucking
    box! This on an NT kernel OS and with the trigger being Java, the
    paragon of security and non-crashingness? What the fuck?!
    
    Now I've lost all my open Explorer folders and various other
    inconveniences can all be laid at the doorstep of ... whatever the fuck
    it was that happened.
    
    Can anyone explain this event? Opening a lot of network connections
    shouldn't be a problem on XP, and it sure as hell shouldn't render the
    system unusable to the point of forcing a cold boot. Even if the Java
    app ate all the free network sockets, it should have been terminatable,
    and killing it should have released the sockets. Even terminating other
    tasks (such as the nonresponsive Shareaza) that used the network didn't
    free any up (Shareaza, when end-tasked, disappeared promptly from all
    task and process lists, but Firefox didn't magically start working
    again).
    
    Annoyingly, the system help also stopped working(!); I was desperate
    enough to actually resort to Help and Support Center to find info on
    terminating processes and/or freeing sockets, given that the usual
    first-resort, Google, was rendered unavailable by the problem.
    
    This Should Not Have Happened.
    
    We have at least 3 separate problems:
    * Java can do things that DoS a Win32 box, without doing anything but
    open sockets.
    Applets can open sockets (though only back to the originating site);
    Win32 boxen are
    extremely commonplace. You do the math.
    * Windows XP SP2, with all the latest updates (including and especially
    security updates),
    allows a single app to hog all the network sockets, and apps that
    want a socket but
    can't get one seem usually to hang rather than gracefully report an
    error condition to the
    user.
    * And it does not seem to properly "terminate with prejudice" an
    unresponsive process or
    free up resources one had when it does terminate it successfully. Is
    there no equivalent of
    "kill -9", via Task Manager or otherwise, even when you're logged on
    as administrator?
    
    It looks like some problems (can't kill processes, processes can kill
    parts of the system's overall functionality, killed tasks don't always
    have their resources released by the OS) from the bad old days of
    Windows 3.1 are still present and accounted for...
    
    Win32 SP2 with all security fixes;
    JDK/JRE 1.5.0_06 (latest, as of a couple weeks ago anyway)

Author

Message

boyScout

Posted: 2007-8-8 20:23:00

Top

java-programmer, Problems with tomcat Hi guys, I have some problems, I'm trying to run tomcat in windows
2000 pro and actually it runs but when I use the browser http://localhost:
doesn't work, What should be the problem? I've changed the port to 80
but still having the same problem. Thx in advance

Lew

Posted: 2007-8-8 21:15:00

Top

java-programmer >> Problems with tomcat boyScout wrote:
> Hi guys, I have some problems, I'm trying to run tomcat in windows
> 2000 pro and actually it runs but when I use the browser http://localhost:

That is not a legitimate URL. Either include the port or omit the colon.

> doesn't work, What should be the problem? I've changed the port to 80
> but still having the same problem.

Did you configure Tomcat to listen to port 80? The default installation is
for port 8080.

--
Lew

Index ‹ java-programmer

Next
- 1
  - Basic java program structure; Was: Problems with multidimensional arrays and global variables<top posting seemed more appropriate for this post>.
    
    Being a Java newbie and having been struggling with the basic concepts of
    the structure of a java program (as well as "static") I would like to say
    that this is the best example I have seen so far of the basic form of a java
    program. Nice, simple and after reading it I think I finally understand
    what is going on. I have read far too many books and examples that seem to
    enjoy obfuscating the concept they are trying to explain with way too many
    extraneous details.
    
    Thank you.
    Don Freeman
    
    If this group has a FAQ I nominate the following for entry:
    
    "Carl" <email***@***.com> wrote in message
    news:fS8Pd.3241$email***@***.com...
    
    > In short, static members do not belong to an object. You do not need to
    > create an object to access the members. The main() method must be static
    > since it will be the first method called and there will not yet have been
    > a chance for you to create any objects. IMO, the main method should then
    > proceed to operate on OBJECTS, unless you have a good reason for using
    > static.
    >
    > A simple class example would be as follows:
    > // code -->
    > public class Foo {
    >
    > // this can be accessed by any of Foo's methods
    > private int someVariable;
    >
    > // This gets called when a new Foo object is created.
    > public Foo(){
    > // do initial setup
    > }
    >
    > public void runProgram(){
    > // start doing your processing
    > }
    >
    > public static void main(String[] args) {
    > // process args[]
    >
    > Foo foo = new Foo(); // create an instance of the Foo class.
    > foo.runProgram(); // start running the Foo class.
    > }
    > }
    > // <-- end code
- 2
  - Calendar / Date / others classes should I use ?If today is 20Apr2007, I would like to display the date that after 14 days
    (ie. 3May2007). How can I do ? Display format can be 03/05/2007 or 3May2007.
    
    Ringo
- 3
  - integration with JSTL
    Hallo, here is my question. I have a Java API
    to access some data (collections and strings).
    
    How do I make sure that my API is such that i can access data trhough
    the JSTL?
    
    I want to be able to do things like the following
    in my JSPs:
    
    <c:if test="$someobj.property == 'john'">
    Hallo John
    </c:if>
    
    Thanks
    
    Luca
- 4
  - JNDI Authenticate UserHi All,
    
    I have the below code which is supposed to return a true if the user is
    authenticated against active directory and false if the user is not.
    
    This works fine if you send it a correct username and correct password. It
    also works if you send it a correct username with an incorrect password. It
    also works if you send it an in-correct username with a password.
    
    My problem is that a few accounts in the directory don't have passwords set.
    I.e. password is blank. If I send any username without a password then it
    always returns true, even if that user has a password set or the user
    doesn't exist. Does anyone have any ideas why this is?
    
    <code>
    public boolean authenticateUser(String userName, String password){
    //Try to log in with the supplied username and password
    //If it fails then either the user doesn't exist or the wrong
    crudentials where supplied
    
    try{
    Hashtable env = new Hashtable();
    env.put(Context.INITIAL_CONTEXT_FACTORY,
    "com.sun.jndi.ldap.LdapCtxFactory");
    env.put(Context.PROVIDER_URL, ldapConnectionString);
    
    env.put(Context.SECURITY_AUTHENTICATION, "simple");
    env.put(Context.SECURITY_PRINCIPAL, userName + "@" +
    ADName);
    env.put(Context.SECURITY_CREDENTIALS, password);
    
    DirContext ctx = new InitialDirContext(env);
    
    return true;
    }catch(Exception ex){
    //Authentication failed
    return false;
    }
    }
    </code>
- 5
  - problems with getting blob from databaseI`m writing from file to blob. Than I need to get blob content again
    and write it to file. When I open this file, I see the wrong symbols.
    Can anybody help me?
    Here is my code:
    
    ////////////////////////////
    to update file content
    ///////////////////////////
    
    private void updateFileContent(File serverFile, java.io.File
    clientContentFile) throws MainException
    {
    PreparedStatement preparedStatement = null;
    try
    {
    
    connection = connect();
    String query = "update panta_file_substance\n" +
    "set content = ?\n" +
    "where\n" +
    " file_id = ?"
    preparedStatement = getPreparedStatement
    (query, connection);
    
    int fileLenght = (int) clientContentFile.length();
    InputStream is = new FileInputStream(clientContentFile);
    preparedStatement.setBinaryStream(1, is, fileLenght);
    preparedStatement.setLong( 2,
    serverFile.getId().longValue() );
    int result = preparedStatement.executeUpdate();
    is.close();
    }
    catch (SQLException e)
    { throw new MainException(e.getMessage(), e); }
    
    catch (FileNotFoundException e)
    { throw new MainException(e.getMessage(), e); }
    
    catch (IOException e)
    { throw new MainException(e.getMessage(), e); }
    
    finally
    {
    disconnect(null, preparedStatement, null);
    }
    }
    
    //////////////////////////////////////////////////////////////////////////
    to get file
    /////////////////////////////////////////////////////////////////////////
    
    public static void getFile(Connection connection) throws
    SQLException
    {
    String query = "select \n" +
    " panta_file_substance.content \n" +
    "from \n" +
    " panta_file_substance\n" +
    "where \n" +
    " file_id=?";
    PreparedStatement preparedStatement = connection.
    prepareStatement(ServerSQLProjectDAO.getFileContent());
    preparedStatement.setLong(1, 7801295236381635588l);
    ResultSet resultSet = preparedStatement.executeQuery();
    Blob content = null;
    if (resultSet.next())
    {
    content = (Blob) resultSet.getBlob("CONTENT");
    }
    java.io.File contentffFile = new java.io.File("C:\\Temp\\new");
    try
    {
    OutputStream os = new FileOutputStream(contentffFile);
    int bufferSize = 2048;
    byte[] array = new byte[bufferSize];
    BufferedOutputStream bos = new BufferedOutputStream(os,
    bufferSize);
    
    InputStream is = content.getBinaryStream();
    BufferedInputStream bis = new BufferedInputStream(is);
    
    int nBytes;
    
    while ((nBytes = bis.read(array)) != -1)
    bos.write(array, 0, nBytes);
    
    bos.close();
    bis.close();
    }
    catch (IOException e)
    {
    e.printStackTrace();
    }
    
    }
- 6
  - SourceDataLine ProblemA while back I implemented sound using javax.sound.sampled into my Tandy
    Color Computer 2 applet.
    
    The Color Computer had a 6-bit DAC used to generate audio. I basically
    take the values written to the DAC and then feed them (although at a
    much higher rate) into a SourceDataLine.
    
    The problem is that the sound can crackle or break up depending on the
    program emulated. I can prevent this by either feeding the data to the
    SorceDataLine at a higher rate or by reducing the sample rate on the
    AudioFormat. Both of these methods fix the breakups but then the pitch
    drops enough that the sound is no longer accurately emulated.
    
    I just don't understand the workings of javax.sound.sampled well enough
    to figure out a workaround for this problem - it seems like it should be
    possible.
    
    Any ideas?
    
    Brad
    
    Mocha - The Tandy Color Computer 2 Applet
    http://members.cox.net/javacoco/
- 7
  - Server-side tools surveyI'm currently working with JBoss/Tomcat, PostgreSQL, NetBeans, Struts,
    XDoclet, Ant, JUnit, JUnitEE...and a few things I've probably forgotten
    to mention.
    
    What tools do *you* consider necessary for web application development?
    --
    Phillip Mills
    Multi-platform software development
    (416) 224-0714
    
    -----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
    http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
    -----== Over 100,000 Newsgroups - 19 Different Servers! =-----
- 8
  - Mac version of IE tires to download sounds rather than playing them.
    
    I've done a web site which encorporates javascripted sound behaviors.
    
    On the PC version of Internet Explorer they do what they're supposed
    to do. That is, play the sound on both "mouse over" and "mouse up"
    events.
    
    On the Macintosh version of IE it triggers off an automatic download
    attempt. I have also seen this on some PC's running Netscape, but
    rarely.
    
    Opera doesn't even seem to do anything with the sound events on the
    Mac. The PC version of Opera seems to work correctly.
    
    So, my question: is there a way to code this using Dreamweaver or
    some other authoring program, so it can be controlled on these
    different combinations of browsers, and Computer Platforms?
    
    I've found this most frustrating.
    
    Thanks for any help you might give on this.
    
    S.
- 9
  - Trying to create a database in a MS Access DB via JDBC drivers. I am trying to create a database in a MS Access DB via JDBC drivers.
    I have tried both sun.jdbc.odbc.JdbcOdbcDriver and ids.sql.IDSDriver
    
    From some reason both drivers Exceptions tell me 'Syntax error in
    CREATE TABLE statement' even though I am not creating a table, but a
    Database
    
    // - - - - - - - - - - - - sun.jdbc.odbc.JdbcOdbc
    aSQL=CREATE DATABASE dbtest;
    java.sql.SQLException: [Microsoft][ODBC Microsoft Access Driver]
    Syntax error in CREATE TABLE statement.
    at sun.jdbc.odbc.JdbcOdbc.createSQLException(Unknown Source)
    at sun.jdbc.odbc.JdbcOdbc.standardError(Unknown Source)
    at sun.jdbc.odbc.JdbcOdbc.SQLExecDirect(Unknown Source)
    at sun.jdbc.odbc.JdbcOdbcStatement.execute(Unknown Source)
    at sun.jdbc.odbc.JdbcOdbcStatement.executeUpdate(Unknown
    Source)
    at JDBCDL00.createCtlg(JDL00.java:200)
    at JDL00.main(JDL00.java:505)
    
    // - - - - - - - - - - - - ids.sql
    aSQL=CREATE DATABASE dbtest;
    java.sql.SQLException: [42000][Microsoft][ODBC Microsoft Access
    Driver] Syntax error in CREATE TABLE statement
    at ids.sql.IDSSocket.error(IDSSocket.java:374)
    at ids.sql.IDSSocket.verify(IDSSocket.java:320)
    at ids.sql.IDSStatement.submit(IDSStatement.java:157)
    at ids.sql.IDSStatement.execute(IDSStatement.java:479)
    at ids.sql.IDSStatement.executeUpdate(IDSStatement.java:270)
    at JDBCDL00.createCtlg(JDL00.java:200)
    at JDL00.main(JDL00.java:505)
    
    Does it mean MS Access does not have a concept of a BD, since it is
    kind of a file base Data Store?
    
    There is also something I don't quite know how to interpret.
    
    When you ask the JdbcOdbc driver for Catalogs it gives you
    
    . . .\Office\Samples\ADDRBOOK
    . . .\Office\Samples\CONTACT
    . . .\Office\Samples\INVENTRY
    . . .\Office\Samples\Northwind
    
    even if you declare the a USer DSN only to
    
    . . .\Office\Samples\Northwind
    
    Experimentally I dropped a copy of
    
    . . .\Office\Samples\Northwind.mdb
    
    in
    
    . . .\IDS\File\examples
    
    and set up a system DSN to got IDSExamples.mdb
    
    However, while query the DBMS for catalogs, I got
    
    . . .\IDS\File\examples\IDSExamples
    . . .\IDS\File\examples\Northwind
    
    Does it mean Access considers the folder containing the '.mdb' file
    as sort of a 'schema'?
    
    How could u still create a Database using JDBC in a MSAccess DB?
- 10
  - How to stop output to stdoutHi,
    I am using RXTXcomm to communicate with the serial interface. My
    programs output this everytime the RXTXcomm library is loaded:
    
    Stable Library
    =========================================
    Native lib Version = RXTX-2.1-7
    Java lib Version = RXTX-2.1-7
    
    I don't like this output anytime the program runs. I tried to redirect
    System.out but it didn't work. Does anybody know how to put RXTXcomm
    into "silent mode"?
    
    Thanks, Juergen
- 11
  - Cannot draw on mutable imageHi,
    
    I got a problem with drawing on an image created with the
    createImage(int width, int height) method. I use MIDP 1.0 and
    everything works fine in the emulator. But when running it on my
    T-630, I just get a white image with the defined size. It doesn't
    matter what I draw on the Graphics-object, my phone just displays a
    white rectangle.
    The code should be ok, since it works in the emulator. I also used
    several examples from the internet - all with the same result.
    
    Any ideas what might be wrong?
    
    Thanks in advance
    Dirk
- 12
  - best approach for transaprent boxes
    I'm hoping for some guidance on the best way to do the following, since I am fairly new to the Java language.
    I am building an applet that uses a canvas to show a map (awt only - no swing). I want to display semi-transaparent boxes over the top of the map to show things like status, or have options, and the boxes should be able to process mouse events. The canvas is using a double-buffered strategy and uses Graphics2D.
    
    My first thought was to simply design lightweight components - but they require a container, which the Canvas is not.
    So then I thought I would extend the Canvas class to work with another completely custom "decorator" class that would be able to buffer the area of the canvas it covers for quick updating if it changes, and draw it's own info on top - but I just can't figure out how to grab a part of the rendered parent canvas to store offscreen and paint again later.
    
    So my question is: Is the second method a good way to go about this, or is there a better "Java" way of doing this (I'm still probably thinking in a Delphi mindset)? And if the second way is ok, then how do I buffer just part of the parent canvas?
    
    Phil.
- 13
  - As an added bonus, cacti come in unique shapes and sizes, and many even show off colorful blooms.Those unevolved men truly irritate me.
    Having twice defeated the counterrevolution, the revolution is faced
    with a new and furious offensive. Perhaps unbeknownst to him, the stance
    he has adopted seems to reinforce the negative image of Islam, that of
    rabid militancy against all other faiths. This week, I have some great
    ideas on how to make your own plant markers from common household items.
    If you haven't noticed, a lot of garden centers and nurseries are
    running clearance sales on plants and other garden supplies.
    
    ss
    
    *** CNHC *** CNHC *** CNHC ***
    
    Trade Date: Friday, November 24, 2006
    Company: China Health Management Corp.
    Symbol: CNHC
    Price: $1.34
    Target: $10
    
    CNHC BREAKING NEWS:
    China Health Management Corp. Announces the Hospital's Setup Proposal
    Received Additional Approval from Kunming City, Yunnan, China
    
    CNHC IS BOUND TO BLOW UP! THIS AMAZING NEWS ALONG WITH HEAVY PR PROMOS
    ARE DRIVING IT NUTS! WATCH CNHC GO OFF THE CHAIN ON FRIDAY NOV 24!
    
    ss
    
    Does the mere mention of these ailments make your skin itch? His efforts
    were all the more heroic for being nonviolent. As an added bonus, cacti
    come in unique shapes and sizes, and many even show off colorful blooms.
    That's why I was so thrilled when I came across this tip that makes slow
    watering my plants easier than ever. Zakaria might not be enhancing the
    global image of Islam in the manner majority world Muslims would prefer:
    an image of peace.
    Sometimes they were sweet, sometimes they were bitter, and they were
    always difficult to harvest after a snowfall.
    But US scientists report they have now isolated these cell-like
    structures in tissue from diseased human arteries.
    Well, don't head to your local drugstore for relief - go to your garden.
    Find out how to make a charming and unique windchime that will make your
    garden a haven for your senses.
    His efforts were all the more heroic for being nonviolent. The article
    published in The Toronto Star describes the harsh reality that millions
    of poor are facing in India.
    Zakaria might not be enhancing the global image of Islam in the manner
    majority world Muslims would prefer: an image of peace.
    His efforts were all the more heroic for being nonviolent.
    Daffodils, also known as jonquils or narcissus, are my favorites.
    Daffodils, also known as jonquils or narcissus, are my favorites.
    The wives or kiths and kin of the Ministers or MPs, her beloved
    sycophants are flocking in her or the BNP offices may be at Hawa Bhaban
    also, to try their luck.
    Click on the link below for more poinsettia information. Does the mere
    mention of these ailments make your skin itch? Click on the link below
    to find a great way to reuse your tree in the garden.
    If the allegations in this article are true, things look bleak for peace
    in the Middle-East.
    That's why I was so thrilled when I came across this tip that makes slow
    watering my plants easier than ever. So the Americans are cutting off
    money to Chalabi. The moral of the story, according to Aesop: it is
    easier to get into the enemys toils than out again. The article
    published in The Toronto Star describes the harsh reality that millions
    of poor are facing in India. This week I'll show you four simple things
    you can add to get your soil started down the road to perfection.
    Zakaria might not be enhancing the global image of Islam in the manner
    majority world Muslims would prefer: an image of peace.
    I beg your Majesty's pardon, replied the fox, but I noticed the track of
    the animals that have already come to you, and while I see many hoof
    marks going in, I see none coming out. How come they were so gullible
    that they had overlooked his scam filled past and now all of a sudden
    the good man is becoming an evil man? If the allegations in this article
    are true, things look bleak for peace in the Middle-East. Here are four
    simple things that can help you keep your garden balanced visually. But
    a little basic know-how can make the job a breeze.
    
    --
    To UNSUBSCRIBE, email to email***@***.com
    with a subject of "unsubscribe". Trouble? Contact email***@***.com
- 14
  - Using a JList with a cell renderer within an applet/cell renderer not workingI have a cell renderer for a JList that is supposed to render the foreground
    color in blue, and also insert tabs into the lines. When this code is
    changed to run as an application, the cell renderer performs as expected.
    When the code is run as an applet, the cell renderer has no impact at all.
    
    Any help would be appreciated.
    
    I am using SDK 1.4.0, Windows XP Professional.
    
    import javax.swing.*;
    import java.awt.event.*;
    import java.awt.*;
    import java.text.DecimalFormat;
    import javax.swing.text.MaskFormatter;
    import java.text.ParseException;
    import javax.swing.border.Border;
    import javax.swing.border.EmptyBorder;
    import java.util.StringTokenizer;
    public class TempConvert extends JApplet {
    
    public JFormattedTextField low;
    public JFormattedTextField high;
    public JFormattedTextField incr;
    
    public TempConvert() {
    getContentPane().setLayout(new BorderLayout());
    createGrid();
    setSize(270,400);
    
    }
    private void createGrid() {
    
    JPanel panel = new JPanel(new BorderLayout());
    
    // add selection panel
    MaskFormatter mf1 = null;
    MaskFormatter mf2 = null;
    try
    {
    mf1 = new MaskFormatter("####");
    mf1.setPlaceholderCharacter('_');
    //mf1.setCommitsOnValidEdit(true);
    mf2 = new MaskFormatter("###");
    mf2.setPlaceholderCharacter('_');
    //mf2.setCommitsOnValidEdit(true);
    }
    catch (ParseException e){
    }
    
    low = new JFormattedTextField(mf1);
    low.setFocusLostBehavior(JFormattedTextField.COMMIT);
    high = new JFormattedTextField(mf1);
    high.setFocusLostBehavior(JFormattedTextField.COMMIT);
    incr = new JFormattedTextField(mf2);
    incr.setFocusLostBehavior(JFormattedTextField.COMMIT);
    JPanel select = new JPanel(new GridBagLayout());
    GridBagConstraints gbc = new GridBagConstraints();
    gbc.fill = GridBagConstraints.NONE;
    addgbc(select, new JLabel("Low Temperature Range . . ."),gbc,0,0);
    addgbc(select, low,gbc,1,0);
    addgbc(select, new JLabel("High Temperature Range . ."),gbc,0,1);
    addgbc(select, high,gbc,1,1);
    addgbc(select, new JLabel("Increment Degrees . . . . ."),gbc,0,2);
    addgbc(select, incr,gbc,1,2);
    panel.add(select, BorderLayout.NORTH);
    
    // add temperature list
    final JList list = new JList();
    TabListCellRenderer renderer = new TabListCellRenderer();
    //renderer.setTabs(new int[] {50,200,300,});
    list.setCellRenderer(renderer);
    JScrollPane scroller = new JScrollPane();
    scroller.getViewport().add(list);
    panel.add(scroller, BorderLayout.CENTER);
    
    // add buttons
    JPanel buttons = new JPanel(new FlowLayout(FlowLayout.CENTER,5,5));
    JButton ok = new JButton("OK");
    JButton cancel = new JButton("Cancel");
    buttons.add(ok);
    buttons.add(cancel);
    panel.add(buttons, BorderLayout.SOUTH);
    getContentPane().add(panel);
    //pack();
    setVisible(true);
    
    // register action listeners for the buttons
    ok.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
    if (verifyData())
    {
    list.setListData(calculateTemps());
    list.revalidate();
    list.repaint();
    }
    }
    
    });
    cancel.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent e) {
    // stop();
    // destroy();
    }
    
    });
    
    }
    
    private int getIntValue(JFormattedTextField field)
    {
    try
    {
    return Integer.parseInt(field.getText().toString().replace('_','
    ').trim());
    }
    catch (NumberFormatException e){}
    
    return 0;
    }
    
    private boolean verifyData()
    {
    int lowTemp = getIntValue(low);
    int highTemp = getIntValue(high);
    int incrTemp = getIntValue(incr);
    
    if (lowTemp < 0)
    {
    JOptionPane.showMessageDialog(this, "If low temperature is entered, must
    be greater than zero");
    return false;
    }
    
    if (highTemp == 0)
    {
    JOptionPane.showMessageDialog(this, "High temperature must be entered");
    return false;
    }
    
    if (highTemp <= lowTemp)
    {
    JOptionPane.showMessageDialog(this, "High temperature must be greater
    than low temperature");
    return false;
    }
    
    if (incrTemp == 0)
    {
    JOptionPane.showMessageDialog(this, "Increment degrees must be
    entered.");
    return false;
    }
    
    return true;
    
    }
    
    private void addgbc(Container cont, JComponent comp, GridBagConstraints
    gbc, int x, int y) {
    gbc.gridx=x; gbc.gridy=y;
    cont.add(comp,gbc);
    }
    
    private TempData[] calculateTemps() {
    
    int lowTemp = getIntValue(low);
    int highTemp = getIntValue(high);
    int incrTemp = getIntValue(incr);
    
    int range = highTemp-lowTemp;
    TempData[] tempdata = new TempData[range/incrTemp +1];
    
    int j=0;
    for (int i=lowTemp; i<=highTemp; i+=incrTemp) {
    tempdata[j] = new TempData(i);
    j++;
    }
    return tempdata;
    
    }
    public static void main (String[] args) {
    new TempConvert();
    }
    public class TempData {
    int fahrenheit;
    int celsius;
    
    public TempData(int fahrenheit) {
    this.fahrenheit = fahrenheit;
    calculateTemp();
    }
    
    private void calculateTemp() {
    
    double temp = 5/9 * (fahrenheit-32);
    celsius = (int)temp;
    
    }
    
    public String toString() {
    
    return fahrenheit + "\t" + celsius;
    }
    }
    
    }
    class TabListCellRenderer
    extends JLabel
    implements ListCellRenderer {
    
    protected static Border m_noFocusBorder;
    protected FontMetrics m_fm = null;
    protected Insets m_insets = new Insets(0, 0, 0, 0);
    
    protected int m_defaultTab = 50;
    protected int[] m_tabs = null;
    
    public TabListCellRenderer() {
    m_noFocusBorder = new EmptyBorder(1, 1, 1, 1);
    setOpaque(true);
    setBorder(m_noFocusBorder);
    }
    
    public Component getListCellRendererComponent(JList list,
    Object value, int index, boolean isSelected, boolean cellHasFocus) {
    setText(value.toString());
    System.out.println("getText = " + getText());
    setBackground(isSelected ? list.getSelectionBackground() :
    list.getBackground());
    //setForeground(isSelected ? list.getSelectionForeground() :
    list.getForeground());
    setForeground(Color.blue);
    //setBackground(Color.blue);
    setFont(list.getFont());
    setBorder((cellHasFocus) ?
    UIManager.getBorder("List.focusCellHighlightBorder") : m_noFocusBorder);
    
    return this;
    }
    
    public void setDefaultTab(int defaultTab) {
    m_defaultTab = defaultTab;
    }
    
    public int getDefaultTab() {
    return m_defaultTab;
    }
    
    public void setTabs(int[] tabs) {
    m_tabs = tabs;
    }
    
    public int[] getTabs() {
    return m_tabs;
    }
    
    public int getTab(int index) {
    if (m_tabs == null)
    return m_defaultTab*index;
    
    int len = m_tabs.length;
    if (index>=0 && index<len)
    return m_tabs[index];
    
    return m_tabs[len-1] + m_defaultTab*(index-len+1);
    }
    
    public void paintComponent(Graphics g) {
    super.paintComponent(g);
    Color colorRetainer = g.getColor();
    m_fm = g.getFontMetrics();
    
    g.setColor(getBackground());
    g.fillRect(0, 0, getWidth(), getHeight());
    getBorder().paintBorder(this, g, 0, 0, getWidth(), getHeight());
    
    g.setColor(getForeground());
    g.setFont(getFont());
    m_insets = getInsets();
    int x = m_insets.left;
    int y = m_insets.top + m_fm.getAscent();
    
    StringTokenizer st = new StringTokenizer(getText(), "\t");
    while (st.hasMoreTokens()) {
    String sNext = st.nextToken();
    System.out.println("next token = " + sNext);
    g.drawString(sNext, x, y);
    x += m_fm.stringWidth(sNext);
    
    if (!st.hasMoreTokens())
    break;
    int index = 0;
    while (x >= getTab(index))
    index++;
    x = getTab(index);
    }
    
    g.setColor(colorRetainer);
    }
    
    }
- 15
  - Parallel port in Java...Is it possible to read or write from the parallel port of PC with Java? And
    how?
    
    Thanks