FULL PRODUCT VERSION :
java version "1.6.0_22"
Java(TM) SE Runtime Environment (build 1.6.0_22-b04)
Java HotSpot(TM) Server VM (build 17.1-b03, mixed mode)
ADDITIONAL OS VERSION INFORMATION :
Linux **** 2.6.32-25-generic #45-Ubuntu SMP Sat Oct 16 19:48:22 UTC 2010 i686 GNU/Linux
EXTRA RELEVANT SYSTEM CONFIGURATION :
Webrowser is Firefox 3.6.11
A DESCRIPTION OF THE PROBLEM :
If multiple Swing-Applications run in a single JVM, like its very common in applet-environments, JLabels, that contain HTML texts will stop rendering, if AppContext changes (see more detailed description below).
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create a simple applet that renders HTML:
--
import javax.swing.*;
import java.awt.*;
public class Test extends JApplet {
public void init() {
getContentPane().setLayout(new FlowLayout());
getContentPane().add(new JLabel("<html>A HTML label</html>"));
getContentPane().add(new JLabel("and a plain label"));
}
}
--
Embed applet in a simple web page like this one:
--
<html>
<body>
<applet code="Test.class" width="250" height="30">
<param name="classloader_cache" value="false" />
</applet>
</body>
</html>
--
Open this page in a browser. A label will be rendered that says "A HTML label and a plain label". Now reload the page. The applet will restart (Important: caching is disabled) and the HTML label will not render anymore. The applet now says "and a plain label".
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
An applet saying "A HTML label and a plain label".
ACTUAL -
An applet saying "and a plain label".
REPRODUCIBILITY :
This bug can be reproduced always.
---------- BEGIN SOURCE ----------
/* Run as applet. See "Steps to reproduce" */
import javax.swing.*;
import java.awt.*;
public class Test extends JApplet {
public void init() {
getContentPane().setLayout(new FlowLayout());
getContentPane().add(new JLabel("<html>A HTML label</html>"));
getContentPane().add(new JLabel("and a plain label"));
}
}
---------- END SOURCE ----------
CUSTOMER SUBMITTED WORKAROUND :
Call the constructor from javax.swing.text.html.parser.ParserDelegator (see below)
import javax.swing.*;
import java.awt.*;
public class Test extends JApplet {
public void init() {
new javax.swing.text.html.parser.ParserDelegator(); // Workaround for BUG
getContentPane().setLayout(new FlowLayout());
getContentPane().add(new JLabel("<html>A HTML label</html>"));
getContentPane().add(new JLabel("and a plain label"));
}
}
Description:
----------------
The second time the applet is started, it gets a new default AppContext assigned. Now the HTML parser, that actually parses the HTML from the JLabel.text relies on a property DTD_KEY, which must be set to the default DTD in the current AppContext. Since we have a new uninitialized AppContext by restarting the applet in the same JVM, the property is missing in AppContext.
The parser fails with a NullPointerException thrown in javax.swing.text.html.Parser (line: 2039) which is swallowed in javax.swing.plaf.basic.BasicHTML (line: 46f) => catch (Throwable e) {}
Calling the constructor from javax.swing.text.html.parser.ParserDelegator initializes the current AppContext with the needed default DTD.
Please note that earlier releases did not suffer from this problem.
java version "1.6.0_22"
Java(TM) SE Runtime Environment (build 1.6.0_22-b04)
Java HotSpot(TM) Server VM (build 17.1-b03, mixed mode)
ADDITIONAL OS VERSION INFORMATION :
Linux **** 2.6.32-25-generic #45-Ubuntu SMP Sat Oct 16 19:48:22 UTC 2010 i686 GNU/Linux
EXTRA RELEVANT SYSTEM CONFIGURATION :
Webrowser is Firefox 3.6.11
A DESCRIPTION OF THE PROBLEM :
If multiple Swing-Applications run in a single JVM, like its very common in applet-environments, JLabels, that contain HTML texts will stop rendering, if AppContext changes (see more detailed description below).
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create a simple applet that renders HTML:
--
import javax.swing.*;
import java.awt.*;
public class Test extends JApplet {
public void init() {
getContentPane().setLayout(new FlowLayout());
getContentPane().add(new JLabel("<html>A HTML label</html>"));
getContentPane().add(new JLabel("and a plain label"));
}
}
--
Embed applet in a simple web page like this one:
--
<html>
<body>
<applet code="Test.class" width="250" height="30">
<param name="classloader_cache" value="false" />
</applet>
</body>
</html>
--
Open this page in a browser. A label will be rendered that says "A HTML label and a plain label". Now reload the page. The applet will restart (Important: caching is disabled) and the HTML label will not render anymore. The applet now says "and a plain label".
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
An applet saying "A HTML label and a plain label".
ACTUAL -
An applet saying "and a plain label".
REPRODUCIBILITY :
This bug can be reproduced always.
---------- BEGIN SOURCE ----------
/* Run as applet. See "Steps to reproduce" */
import javax.swing.*;
import java.awt.*;
public class Test extends JApplet {
public void init() {
getContentPane().setLayout(new FlowLayout());
getContentPane().add(new JLabel("<html>A HTML label</html>"));
getContentPane().add(new JLabel("and a plain label"));
}
}
---------- END SOURCE ----------
CUSTOMER SUBMITTED WORKAROUND :
Call the constructor from javax.swing.text.html.parser.ParserDelegator (see below)
import javax.swing.*;
import java.awt.*;
public class Test extends JApplet {
public void init() {
new javax.swing.text.html.parser.ParserDelegator(); // Workaround for BUG
getContentPane().setLayout(new FlowLayout());
getContentPane().add(new JLabel("<html>A HTML label</html>"));
getContentPane().add(new JLabel("and a plain label"));
}
}
Description:
----------------
The second time the applet is started, it gets a new default AppContext assigned. Now the HTML parser, that actually parses the HTML from the JLabel.text relies on a property DTD_KEY, which must be set to the default DTD in the current AppContext. Since we have a new uninitialized AppContext by restarting the applet in the same JVM, the property is missing in AppContext.
The parser fails with a NullPointerException thrown in javax.swing.text.html.Parser (line: 2039) which is swallowed in javax.swing.plaf.basic.BasicHTML (line: 46f) => catch (Throwable e) {}
Calling the constructor from javax.swing.text.html.parser.ParserDelegator initializes the current AppContext with the needed default DTD.
Please note that earlier releases did not suffer from this problem.
- relates to
-
JDK-6995162 REGRESSION:JLabel with HTML text not showing in applet when applet restarted in IE8
-
- Closed
-
-
-
- Closed
-