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Duplicate :
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Name: gm110360 Date: 06/17/2003
FULL PRODUCT VERSION :
java version "1.4.1_02"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1_02-b06)
Java HotSpot(TM) Client VM (build 1.4.1_02-b06, mixed mode)
FULL OS VERSION :
Microsoft Windows XP [Version 5.1.2600]
EXTRA RELEVANT SYSTEM CONFIGURATION :
ATI graphics card
A DESCRIPTION OF THE PROBLEM :
When an applet tag is written to an HTML document, the applet is loaded but a NullPointerException is thrown before init and getDocumentBase() returns null. If the applet tag appears in the HTML when it is loaded or on 1.3.x versions of the plug-in, everything works fine.
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
- Compile AppletTest.java (source below) in the same directory as applet-inline.html and applet-written.html
- Configure IE to use java plug-in 1.4.1_02 (or any previous 1.4.x)
- Open applet-inline.html (source below) in IE.
- Open the java console. It will show (as expected) something like:
here in init
ac = sun.plugin.viewer.context.IExplorerAppletContext@d6a05e
db = file:/C:/at/applet-inline.html
- Open applet-written.html (source below) in IE.
- Open the java console. It will show something like:
java.lang.NullPointerException
at sun.plugin.viewer.context.IExplorerAppletContext.getJSObject(Unknown Source)
at sun.plugin.AppletViewer.getDocumentBase(Unknown Source)
at sun.plugin.AppletViewer.getCodeBase(Unknown Source)
at sun.plugin.AppletViewer.appletInit(Unknown Source)
at sun.plugin.viewer.LifeCycleManager.initAppletPanel(Unknown Source)
at sun.plugin.viewer.IExplorerPluginObject$Initer.run(Unknown Source)
here in init
ac = sun.plugin.viewer.context.IExplorerAppletContext@1b3f8f6
db = null
EXPECTED VERSUS ACTUAL BEHAVIOR :
The console should contain something like:
here in init
ac = sun.plugin.viewer.context.IExplorerAppletContext@d6a05e
db = file:/C:/at/applet-inline.html
as it does for applet-inline.html and for both .html files using a 1.3.x plug-in.
With applet-written.html and the 1.4.x plug-in, the console contains:
java.lang.NullPointerException
at sun.plugin.viewer.context.IExplorerAppletContext.getJSObject(Unknown Source)
at sun.plugin.AppletViewer.getDocumentBase(Unknown Source)
at sun.plugin.AppletViewer.getCodeBase(Unknown Source)
at sun.plugin.AppletViewer.appletInit(Unknown Source)
at sun.plugin.viewer.LifeCycleManager.initAppletPanel(Unknown Source)
at sun.plugin.viewer.IExplorerPluginObject$Initer.run(Unknown Source)
here in init
ac = sun.plugin.viewer.context.IExplorerAppletContext@1b3f8f6
db = null
ERROR MESSAGES/STACK TRACES THAT OCCUR :
See results above.
REPRODUCIBILITY :
This bug can be reproduced always.
---------- BEGIN SOURCE ----------
Here is AppletTest.java:
----------------------------------------------------------------------
import java.net.URL;
import java.applet.Applet;
public class AppletTest extends Applet
{
public void init()
{
System.err.println("here in init");
System.err.println("ac = " + getAppletContext());
URL db = getDocumentBase();
System.err.println("db = " + db);
}
}
----------------------------------------------------------------------
Here is applet-inline.html:
----------------------------------------------------------------------
<html>
<head>
<title>Applet Test</title>
</head>
<body>
<applet name="AppletTest" code="AppletTest.class" width=100 height=40
mayscript></applet>
</body>
</html>
----------------------------------------------------------------------
Here is applet-written.html:
----------------------------------------------------------------------
<html>
<head>
<title>Applet Test</title>
<script type='text/javascript'>
<!--
function go()
{
var s = '<applet name="AppletTest" ' +
'code="AppletTest.class" ' +
'width=100 ' +
'height=40 ' +
'mayscript>' +
'</applet>';
if (document.all)
document.all.appletHolder.innerHTML = s;
else if (document.getElementById)
document.getElementById('appletHolder').innerHTML = s;
else
alert('This example doesn\'t work on your browser');
}
//-->
</script>
</head>
<body onload="go()">
<div id=appletHolder style="position: absolute;"></div>
</body>
</html>
---------- END SOURCE ----------
(Review ID: 184110)
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