Does this applet work in an Iced Tea JRE?

那年仲夏 提交于 2019-11-28 02:09:54

Here is the output on java.stderr (one half of the equivalent of the Java console - the other half is java.stdout, which is empty in your case):

net.sourceforge.jnlp.LaunchException: Fatal: Initialization Error: Could not initialize applet.
        at net.sourceforge.jnlp.Launcher.createApplet(Launcher.java:604)
        at net.sourceforge.jnlp.Launcher.getApplet(Launcher.java:548)
        at net.sourceforge.jnlp.Launcher$TgThread.run(Launcher.java:729)
Caused by: net.sourceforge.jnlp.LaunchException: Fatal: Launch Error: Jars not verified.
        at net.sourceforge.jnlp.runtime.JNLPClassLoader.checkTrustWithUser(JNLPClassLoader.java:467)
        at net.sourceforge.jnlp.runtime.JNLPClassLoader.initializeResources(JNLPClassLoader.java:410)
        at net.sourceforge.jnlp.runtime.JNLPClassLoader.<init>(JNLPClassLoader.java:168)
        at net.sourceforge.jnlp.runtime.JNLPClassLoader.getInstance(JNLPClassLoader.java:249)
        at net.sourceforge.jnlp.Launcher.createApplet(Launcher.java:575)
        ... 2 more
Caused by: 
net.sourceforge.jnlp.LaunchException: Fatal: Launch Error: Jars not verified.
        at net.sourceforge.jnlp.runtime.JNLPClassLoader.checkTrustWithUser(JNLPClassLoader.java:467)
        at net.sourceforge.jnlp.runtime.JNLPClassLoader.initializeResources(JNLPClassLoader.java:410)
        at net.sourceforge.jnlp.runtime.JNLPClassLoader.<init>(JNLPClassLoader.java:168)
        at net.sourceforge.jnlp.runtime.JNLPClassLoader.getInstance(JNLPClassLoader.java:249)
        at net.sourceforge.jnlp.Launcher.createApplet(Launcher.java:575)
        at net.sourceforge.jnlp.Launcher.getApplet(Launcher.java:548)
        at net.sourceforge.jnlp.Launcher$TgThread.run(Launcher.java:729)
java.lang.NullPointerException
        at net.sourceforge.jnlp.NetxPanel.runLoader(NetxPanel.java:99)
        at sun.applet.AppletPanel.run(AppletPanel.java:380)
        at java.lang.Thread.run(Thread.java:636)
java.lang.NullPointerException
        at sun.applet.AppletPanel.run(AppletPanel.java:430)
        at java.lang.Thread.run(Thread.java:636)
java.lang.Exception: Applet initialization timeout
        at sun.applet.PluginAppletViewer.handleMessage(PluginAppletViewer.java:637)
        at sun.applet.PluginStreamHandler.handleMessage(PluginStreamHandler.java:270)
        at sun.applet.PluginMessageHandlerWorker.run(PluginMessageHandlerWorker.java:82)
java.lang.RuntimeException: Failed to handle message: handle 60822154 for instance 2
        at sun.applet.PluginAppletViewer.handleMessage(PluginAppletViewer.java:660)
        at sun.applet.PluginStreamHandler.handleMessage(PluginStreamHandler.java:270)
        at sun.applet.PluginMessageHandlerWorker.run(PluginMessageHandlerWorker.java:82)
Caused by: java.lang.Exception: Applet initialization timeout
        at sun.applet.PluginAppletViewer.handleMessage(PluginAppletViewer.java:637)
        ... 2 more

So, it looks like your applet code is not even loaded if I press Cancel in the dialog box.

I think there is nothing you can do here from the Java side - maybe using another signing procedure or starting the applet by JNLP would help. Or filing a bug report on IcedTea.


To demonstrate this, I created a real simple applet by omitting everything critical from your applet:

package org.pscode.eg.docload;

import java.awt.FlowLayout;
import javax.swing.*;

public class Example extends JApplet {


    JLabel label;

    public void init()
    {
        System.out.println("init()");
        SwingUtilities.invokeLater(new Runnable(){public void run() {
            label = new JLabel("inited.");
            getContentPane().setLayout(new FlowLayout());
            getContentPane().add(label);
        }});
    }

    @Override
    public void start() {
        System.out.println("start()");
        label.setText("started.");
    }

    @Override
    public void stop() {
        System.out.println("stop()");
        label.setText("stopped.");
    }

    @Override
    public void destroy() {
        System.out.println("destroy()");
        label.setText("destroyed.");
    }
}

I compiled this and modified your HTML file to use this instead, and it gives totally the same symptoms.

It seems IcedTea has redefined what to do when the user presses cancel. To be fair, the buttons in the dialog box are "Run" and "Cancel", not "Run with all permissions" and "Run sandboxed".

(In Sun's dialog there are the same buttons, but in effect they mean something else than asked.)

For reference, I can confirm @Paŭlo Ebermann's results using IcedTea 1.9.7 on Ubuntu 10.04:

$ java -version
java version "1.6.0_20"
OpenJDK Runtime Environment (IcedTea6 1.9.7) (6b20-1.9.7-0ubuntu1~10.04.1)
OpenJDK Client VM (build 19.0-b09, mixed mode, sharing)

appletviewer shows the expected sandbox and the fllowing diagnostic output. Firefox on Ubuntu offers only Run (trusted) or Cancel (nothing).

$ appletviewer http://pscode.org/test/docload/applet-latest.html
Warning: Can't read AppletViewer properties file: … Using defaults.
init()
init(): entering 'try'
init(): instantiate file
init(): file instantiated, create file chooser
java.security.AccessControlException: access denied (java.util.PropertyPermission user.home read)
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:393)
    at java.security.AccessController.checkPermission(AccessController.java:553)
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
    at java.lang.SecurityManager.checkPropertyAccess(SecurityManager.java:1302)
    at java.lang.System.getProperty(System.java:669)
    at javax.swing.filechooser.FileSystemView.getHomeDirectory(FileSystemView.java:397)
    at javax.swing.plaf.metal.MetalFileChooserUI.installComponents(MetalFileChooserUI.java:282)
    at javax.swing.plaf.basic.BasicFileChooserUI.installUI(BasicFileChooserUI.java:153)
    at javax.swing.plaf.metal.MetalFileChooserUI.installUI(MetalFileChooserUI.java:155)
    at javax.swing.JComponent.setUI(JComponent.java:651)
    at javax.swing.JFileChooser.updateUI(JFileChooser.java:1781)
    at javax.swing.JFileChooser.setup(JFileChooser.java:374)
    at javax.swing.JFileChooser.(JFileChooser.java:347)
    at javax.swing.JFileChooser.(JFileChooser.java:330)
    at org.pscode.eg.docload.DocumentLoader.init(DocumentLoader.java:57)
    at sun.applet.AppletPanel.run(AppletPanel.java:436)
    at java.lang.Thread.run(Thread.java:636)
start()
stop()
destroy()

On Mac OS X, Safari 5.05 produces the expected results; and appletviewer produces comparable, but not identical, output.

$ java -version
java version "1.6.0_24"
Java(TM) SE Runtime Environment (build 1.6.0_24-b07-334-9M3326)
Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02-334, mixed mode)

$ appletviewer http://pscode.org/test/docload/applet-latest.html
init()
init(): entering 'try'
init(): instantiate file
init(): file instantiated, create file chooser
java.security.AccessControlException: access denied (java.io.FilePermission . read)
    at java.security.AccessControlContext.checkPermission(AccessControlContext.java:374)
    at java.security.AccessController.checkPermission(AccessController.java:546)
    at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
    at java.lang.SecurityManager.checkRead(SecurityManager.java:871)
    at java.io.File.exists(File.java:731)
    at javax.swing.JFileChooser.setCurrentDirectory(JFileChooser.java:548)
    at javax.swing.JFileChooser.(JFileChooser.java:334)
    at javax.swing.JFileChooser.(JFileChooser.java:316)
    at org.pscode.eg.docload.DocumentLoader.init(DocumentLoader.java:57)
    at sun.applet.AppletPanel.run(AppletPanel.java:424)
    at java.lang.Thread.run(Thread.java:680)
start()
stop()
destroy()
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