JDK-8034955 : JLabel/JToolTip throw ClassCastException for "a" </div>
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<li><span class="boldText">Type:</span> <span class="detailsText">Bug</span></li>
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<li><span class="boldText">Component:</span> <span class="detailsText">client-libs</span></li>
<li><span class="boldText">Sub-Component:</span> <span class="detailsText">javax.swing</span>
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<li><span class="boldText">Affected Version:</span> <span class="detailsText">6u37,7,8,9 </span></li>
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<li><span class="boldText">Priority:</span> <span class="detailsText">P3</span></li>
<li><span class="boldText">Status:</span> <span class="detailsText">Resolved</span></li>
<li><span class="boldText">Resolution:</span> <span class="detailsText">Fixed</span></li>
<li><span class="boldText">OS:</span> <span class="detailsText">generic</span></li>
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<li><span class="boldText">Submitted:</span> <span class="detailsText">2013-04-04</span>
<li><span class="boldText">Updated:</span> <span class="detailsText">2014-07-29</span>
<li><span class="boldText">Resolved:</span> <span class="detailsText">2014-04-01</span>
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<label> Versions (Unresolved/Resolved/Fixed)</label>
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<span class="bscTooltiptext" style="width: 350px !important;">The Version table provides details related to the release that this issue/RFE will be addressed.<br><br>
<strong>Unresolved</strong> : Release in which this issue/RFE will be addressed.<br><strong>Resolved</strong>: Release in which this issue/RFE has been resolved.<br>
<strong>Fixed</strong> : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
<br><br> To download the current JDK release, click <a href="https://www.oracle.com/technetwork/java/javase/downloads/index.html" target="_blank">here</a>. </span>
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<th>JDK 8</th>
<th>JDK 9</th>
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<td ><span class="versionTableVal">8u20 b09</span><span class="label round label-success">Fixed </span><a href="https://www.oracle.com/java/technologies/javase/javase-jdk8-downloads.html?msgid=bugsview8" target="_blank"> <img src="/bugdatabase/bugdatabase-theme/images/download.gif"/></a></td>
<td ><span class="versionTableVal">9</span><span class="label round label-success">Fixed </span><a href="https://www.oracle.com/java/technologies/javase-jdk15-downloads.html?msgid=bugsview15" target="_blank"> <img src="/bugdatabase/bugdatabase-theme/images/download.gif"/></a></td>
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<div class="sectionTitle">Related Reports</div>
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<td>
<div class="boldText" >Relates : </div>
</td>
<td align="left">
<div class="bugLink" ><a href="view_bug?bug_id=6618964">JDK-6618964 - HTML rendering in JLabel throws ClassCastException </a></div>
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<div class="sectionTitle">Description</div>
<div class="section row"> <div class="subsection col-md-12"><div class="descriptionText"><span id="linkDescriptionText"><PRE >FULL PRODUCT VERSION :
java version " 1.7.0_09 " , java version " 1.6.0_37 "
ADDITIONAL OS VERSION INFORMATION :
not OS specific
A DESCRIPTION OF THE PROBLEM :
Setting the text of a JLabel or the tip text of a JToolTip to " <html>a<title> " (and similar text with <title> *outside* <head>...</head>) throws ClassCastException:
Seems to be related to bugs 4845362 and 4908714.
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create a JLabel, set its text to " <html>a<title> " , display the label in a Swing GUI. Alternatively, set the tool tip text for any JComponent to " <html>a<title> " and wait for ToolTipManager to display the tip.
See also the test case below.
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
JLabel/JToolTip renders plain text, either " a " or " <html>a<title> " .
ACTUAL -
Program exits with ClassCastException, see below.
ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread " AWT-EventQueue-0 " java.lang.ClassCastException: javax.swing.JLabel cannot be cast to javax.swing.text.JTextComponent
at javax.swing.text.html.EditableView.paint(EditableView.java:59)
at javax.swing.text.BoxView.paintChild(BoxView.java:144)
at javax.swing.text.BoxView.paint(BoxView.java:416)
at javax.swing.text.BoxView.paintChild(BoxView.java:144)
at javax.swing.text.BoxView.paint(BoxView.java:416)
at javax.swing.text.ParagraphView.paint(ParagraphView.java:587)
at javax.swing.text.html.ParagraphView.paint(ParagraphView.java:224)
at javax.swing.text.BoxView.paintChild(BoxView.java:144)
at javax.swing.text.BoxView.paint(BoxView.java:416)
at javax.swing.text.html.BlockView.paint(BlockView.java:265)
at javax.swing.text.BoxView.paintChild(BoxView.java:144)
at javax.swing.text.BoxView.paint(BoxView.java:416)
at javax.swing.text.html.BlockView.paint(BlockView.java:265)
at javax.swing.plaf.basic.BasicHTML$Renderer.paint(BasicHTML.java:464)
at javax.swing.plaf.basic.BasicLabelUI.paint(BasicLabelUI.java:156)
at javax.swing.plaf.ComponentUI.update(ComponentUI.java:143)
at javax.swing.JComponent.paintComponent(JComponent.java:752)
at javax.swing.JComponent.paint(JComponent.java:1029)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JComponent.paint(JComponent.java:1038)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JComponent.paint(JComponent.java:1038)
at javax.swing.JLayeredPane.paint(JLayeredPane.java:567)
at javax.swing.JComponent.paintChildren(JComponent.java:862)
at javax.swing.JComponent.paintToOffscreen(JComponent.java:5131)
at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:278)
at javax.swing.RepaintManager.paint(RepaintManager.java:1224)
at javax.swing.JComponent.paint(JComponent.java:1015)
at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21)
at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:60)
at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97)
at java.awt.Container.paint(Container.java:1780)
at java.awt.Window.paint(Window.java:3375)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:796)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:713)
at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:693)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:125)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
REPRODUCIBILITY :
This bug can be reproduced always.
---------- BEGIN SOURCE ----------
package com.yworks.swing;
import java.awt.EventQueue;
import java.util.Locale;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class HtmlRenderingTest {
public static void main( String[] args ) {
EventQueue.invokeLater(new Runnable() {
public void run() {
Locale.setDefault(Locale.ENGLISH);
final JFrame frame = new JFrame(HtmlRenderingTest.class.getName());
frame.getContentPane().add(new JLabel( " <html>a<title> " ));
frame.setVisible(true);
}
});
}
}
---------- END SOURCE ----------
CUSTOMER SUBMITTED WORKAROUND :
Subclass JLabel and overwrite methods setText and paintComponent:
class SafeLabel extends JLabel {
public void setText( final String text ) {
try {
super.setText(text);
} catch (ClassCastException e) {
if (isHtmlString(getText())) {
// JDK 1.4/1.5 throw CCE here for invalid HTML
// ignore - seems to render some text in spite of the exception
} else {
throw e;
}
}
}
protected void paintComponent( final Graphics g ) {
try {
super.paintComponent(g);
} catch (ClassCastException e) {
if (isHtmlString(getText())) {
// JDK 1.6/1.7 throw CCE here for invalid HTML
// ignore - seems to render some text in spite of the exception
} else {
throw e;
}
}
}
public JToolTip createToolTip() {
final JToolTip tip = new SafeToolTip();
tip.setComponent(this);
return tip;
}
private static boolean isHtmlString( final String text ) {
return SafeToolTip.isHtmlString(text);
}
}
class SafeToolTip extends JToolTip {
public void setTipText( final String tipText ) {
try {
super.setTipText(tipText);
} catch (ClassCastException e) {
if (isHtmlString(tipText)) {
// JDK 1.4/1.5 throw CCE here for invalid HTML
// ignore - seems to render some text in spite of the exception
} else {
throw e;
}
}
}
protected void paintComponent( final Graphics g ) {
try {
super.paintComponent(g);
} catch (ClassCastException e) {
if (isHtmlString(getTipText())) {
// JDK 1.6/1.7 throw CCE here for invalid HTML
// ignore - seems to render some text in spite of the exception
} else {
throw e;
}
}
}
static boolean isHtmlString( final String text ) {
return BasicHTML.isHTMLString(text);
}
}
</PRE></span></div></div></div>
<div class="sectionTitle">Comments</div>
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<div class="descriptionText"><span id="linkCommentText">There is missed 'instance of' check in the EditableView.paint(Graphics. shape) method.</span></div>
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<div class="commentDate">
03-03-2014
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<div class="descriptionText"><span id="linkCommentText">Release team: Approved for deferral.</span></div>
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<div class="commentDate">
18-02-2014
</div><hr>
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<div class="descriptionText"><span id="linkCommentText">8-defer-request:
Not a regression from JDK 7, not a JCK, not a P1. Not a stopper for JDK 8.</span></div>
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<div class="commentDate">
14-02-2014
</div><hr>
</td></tr>
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<div class="descriptionText"><span id="linkCommentText">This is the corrected source that does not have spaces in the label text (probably because of the issue INTJDK-7605718 )
---------- BEGIN SOURCE ----------
package com.yworks.swing;
import java.awt.EventQueue;
import java.util.Locale;
import javax.swing.JFrame;
import javax.swing.JLabel;
public class HtmlRenderingTest {
public static void main( String[] args ) {
EventQueue.invokeLater(new Runnable() {
public void run() {
Locale.setDefault(Locale.ENGLISH);
final JFrame frame = new JFrame(HtmlRenderingTest.class.getName());
frame.getContentPane().add(new JLabel( "<html>a<title>"));
frame.setVisible(true);
}
});
}
}
---------- END SOURCE ----------</span></div>
</td></tr>
<tr><td align="right" width="80" class="grey5">
<div class="commentDate">
14-02-2014
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