JNLPException: security error how to resolve

Question

"JNLPException[category: security error : Exception: null : LaunchDesc: null " it happened when run app.jnlp on the java web start.
the app.jnlp is following:
{code}<?xml version="1.0" encoding="utf-8"?>
<jnlp spec="1.0+"
codebase="http://192.168.0.7:8080/b2/c8/splash/">
<information>
<title>A User-Friendly App</title>
<vendor>Mauro Inc.</vendor>
<homepage href="home.html"/>
<description>Install Your programs via the Web, quickly and effectively!</description>
<description kind="short">An example of a simple Java-launched Installator</description>
<security>
<all-permissions/>
</security>
<offline-allowed/>
</information>
<resources>
<j2se version="1.5+"/>
<extension
name="Splash Window"
href="splash.jnlp">
</extension>
<jar href="app.jar"/>
<jar href="first.jar"/>
<jar href="second.jar"/>
<jar href="third.jar"/>
</resources>
<application-desc/>
</jnlp>
{code}
the splash.jnlp is following:
{code}
<?xml version="1.0" encoding="utf-8"?>
<jnlp
     spec="1.0+"
     codebase="http://192.168.0.7:8080/b2/c8/splash//">
     <information>
          <title>Install Your Program Via the Web,quickly and effectively!</title>
          <vendor>Mauro Inc.</vendor>
          <homepage href="home.html"/>
          <description>Install Your Program Via the Web,quickly and effectively!</description>
          <description kind="short">A simple Java-launched Installator</description>
          <offline-allowed/>
     </information>
     <resource>
          <j2se version="1.5+"/>
          <jar href="splash.jar"/>
     </resource>
     <installer-desc main-class="com.fei.Splash"/>
</jnlp>
{code}
The error message is that reference many host computer in one resource.But use other jar file,it do not have error.In this error,I use a singleton pattem in the jar file.
thanks for your attention.
Edited by: feiyangdefei on Jan 28, 2008 6:04 AM
Edited by: feiyangdefei on Jan 28, 2008 6:06 AM
Edited by: feiyangdefei on Jan 28, 2008 6:08 AM

Answer 1

by the way,the App.java is following:
import java.awt.BorderLayout;
import java.awt.event.WindowAdapter;
import javax.swing.JLabel;
import javax.swing.JFrame;
import javax.swing.ImageIcon;
import java.awt.event.WindowEvent;
public class App extends JFrame{
     public App(){
          ImageIcon img =
               new ImageIcon(getClass().getClassLoader().getResource("images/back.jpg"));
          JLabel jlabel = new JLabel(img);
          jlabel.setLayout(new BorderLayout());
          jlabel.add(new JLabel("An Application..."));
          getContentPane().add(jlabel);
          addWindowListener(new WindowAdapter(){
               public void windowClosing(WindowEvent e){
                    System.exit(0);
          pack();
          setVisible(true);
     public static void main(String[] args){
          App app = new App();
}and the Splash.java is following:
import java.awt.*;
import javax.swing.*;
import javax.jnlp.*;
import java.net.URL;
public class Splash extends JWindow implements Runnable{
  private ClassLoader loader;
  private static ExtensionInstallerService extensionInstaller;
  private JLabel ImageLabel;
  private JLabel MessageLabel  = new JLabel();
  private JLabel animLabel;
  private JLabel resourceLabel  = new JLabel();
  private static Splash splash;
  //data
  private String[] jarSequence= {"first.jar", "second.jar", "third.jar"};
  private String[] msgSequence= {
    "Now Even More Powerful!",
    "Incredibly Fast And Reliable!",
    "Ready To Go?"};
  private String codebase = "http://192.168.0.7:8080/jwstest/";
   * Private Constructor - Implements the Singleton Design Pattern
  private Splash() {
    super();
    loader = getClass().getClassLoader();
    //prepare UI
    //ImageLabel = new JLabel(new ImageIcon(loader.getResource("images/background.jpg")));
    ImageLabel = new JLabel(new ImageIcon("images/background.jpg"));
    //animLabel = new JLabel(new ImageIcon(loader.getResource("images/working.gif")));
    animLabel = new JLabel(new ImageIcon("images/background.jpg"));
    resourceLabel.setBorder(BorderFactory.createEmptyBorder(6,6,6,6));
    ImageLabel.setLayout(new BorderLayout());
    ImageLabel.setBorder(BorderFactory.createRaisedBevelBorder());
    ImageLabel.add(resourceLabel, BorderLayout.NORTH);
    ImageLabel.add(MessageLabel, BorderLayout.SOUTH);
    ImageLabel.add(animLabel, BorderLayout.CENTER);
    getContentPane().setLayout(new BorderLayout());
    getContentPane().add(ImageLabel, BorderLayout.CENTER);
    pack();
    //Centers the window
    Dimension size = getSize();
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    if (size.height > screenSize.height) {
      size.height = screenSize.height;
    if (size.width > screenSize.width) {
      size.width = screenSize.width;
    setLocation((screenSize.width - size.width) / 2, (screenSize.height - size.height) / 2);
   * Implements the Singleton Design Pattern
  public static Splash getInstance(){
    if (splash == null)
      splash = new Splash();
    return splash;
   * Sets a message visible at the bottom
   * @param text Text to show
  public static void setMessage(String text) {
    if (splash != null)
      splash.MessageLabel.setText("    " + text);
   * Sets a message visible at the top showing the
   * currently downloading resource file
   * @param rsr Text to show
  public static void setLoadingResource(String rsr) {
    if (splash != null) {
      splash.resourceLabel.setText("Downloading: "+rsr);
   * Shows up the splash window or destroys it
   * @param show
  public static void showUp(boolean show) {
    if (splash == null)
      return;
    splash.setVisible(show);
    if (show == false) {
      splash.setCursor(Cursor.getDefaultCursor());
      splash = null;
    } else {
      splash.setCursor(new Cursor(Cursor.WAIT_CURSOR));
      try {
        // Lookup the Service
        extensionInstaller =
          (ExtensionInstallerService)ServiceManager.lookup("javax.jnlp.ExtensionInstallerService");
        // Hide JNLP Client's download window
        extensionInstaller.hideStatusWindow();
      } catch(UnavailableServiceException use) {
        System.out.println("Service not supported: "+use);
   * Takes charge of all the JAR delivery
  public void run() {
    DownloadService ds;
    int jarNumber = jarSequence.length;
    try {
      ds = (DownloadService)ServiceManager.lookup("javax.jnlp.DownloadService");
    } catch (UnavailableServiceException use) {
      ds = null;
      System.out.println("Service is not supported: "+use);
    }//once have a ds you can do a lot of things
    //begin downloading jars
    for (int i=0;i<jarNumber;i++){
      if (ds != null) {
        processJar(ds,i);
      //take a breath
      try {
        Thread.currentThread().sleep(3000);//IT'S ONLY COSMETICS!
//        Thread.currentThread().yield();
      } catch (Exception e) {
        System.out.println("Synchronization Exception: "+e);
    }//-for
    showUp(false);//all the needed JARs have processed
    extensionInstaller.installSucceeded(true);//we're optimistic
   * A fancy method that finds out if a JAR is cached and removes it.
   * substitute it with your code.
  private void processJar(DownloadService ds, int i){
    try {
      // determine if a particular resource is cached
      URL url =
        new URL(codebase + jarSequence);
boolean cached = ds.isResourceCached(url, null);
// remove the resource from the cache, just for fun
if (cached) {
ds.removeResource(url, null);
// reload the resource into the cache, yes!
setMessage(msgSequence[i]);
setLoadingResource(jarSequence[i]);
DownloadServiceListener dsl = ds.getDefaultProgressWindow();
ds.loadResource(url, null, dsl);
} catch (Exception e) {
System.out.println("Loading Resource: " + e);
public static void main(String[] args) {
Splash splash1 = Splash.getInstance();
splash1.showUp(true);
splash1.run();
thank you again.
Edited by: feiyangdefei on Jan 28, 2008 6:14 AM
Edited by: feiyangdefei on Jan 28, 2008 6:15 AM