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org.openide.awt.SwingBrowserImpl.run() will do some UI operation on non AWT thread. In an application with EDT violation monitoring (e.g JDEV debug version), it would trigger exception: EDT Violations:May 01, 2015 9:08:45 AM oracle.javatools.internal.ui.SwingThreadViolationDetector$Violation report INFO: Call to Swing component not from the EDT Thread - in violation of Swing's single threaded policy. javax.swing.JLabel[,0,586,400x14,alignmentX=0.0,alignmentY=0.0,border=,flags=8388608,maximumSize=,minimumSize=,preferredSize=,defaultIcon=,disabledIcon=,horizontalAlignment=LEADING,horizontalTextPosition=TRAILING,iconTextGap=4,labelFor=org.openide.awt.HtmlBrowser[,0,0,400x600,invalid,layout=java.awt.BorderLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=9,maximumSize=,minimumSize=,preferredSize=],text=Document: Done,verticalAlignment=CENTER,verticalTextPosition=CENTER] at javax.swing.JComponent.repaint(JComponent.java:4802) at java.awt.Component.repaint(Component.java:3303) at javax.swing.JLabel.setText(JLabel.java:345) at org.openide.awt.HtmlBrowser$BrowserListener.propertyChange(HtmlBrowser.java:703) at java.beans.PropertyChangeSupport.fire(PropertyChangeSupport.java:335) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:327) at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:263) at org.openide.awt.SwingBrowserImpl.setStatusText(SwingBrowserImpl.java:372) at org.openide.awt.SwingBrowserImpl.run(SwingBrowserImpl.java:348) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1425) at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68) at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303) at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2038) Click a button whose actionListener would perform the following code: HtmlBrowser browser = new HtmlBrowser(); browser.setURL(url); JFrame frame = new JFrame(); frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE); frame.getContentPane().add(browser); frame.pack(); frame.setVisible(true); url points to a html file inside jar: url = MyClass.class.getClassLoader().getResource("com/oracle/.../MyPage.html"); The html did get displayed but it also throw the EDT violation.
afaik bugtracking calls only HtmlBrowser.URLDisplayer.getDefault.showURL(url); please evaluate
Fixed by https://hg.netbeans.org/web-main/rev/24a64a0d8d6c
Integrated into 'main-silver', will be available in build *201507100001* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress) Changeset: http://hg.netbeans.org/main-silver/rev/24a64a0d8d6c User: Jan Stola <jstola@netbeans.org> Log: #252308: org.openide.awt.SwingBrowserImpl.run() performs UI operation on non AWT thread