I am launching a test which creates a JEditorPane passing a URL in the constructor. I am adding this JEditorPane to a scrollpane and making it visible. As soon as the JFrame is launched, I am seeing a NullPointerException on the console.

This exception is intermittent but I am able to reproduce it 1 out of 3 times. I reproduced this on WinXP as well as SolSparc10. The probability of seeing the exception is more when using a local JDK and not the one on the network. I reproduced it with JDK7-b07 as well as JDK6-b105 (both are local). Reproducible across look & feels.

I have attached a sample test. Execute it as follows -
java JEditorPaneTest PrintQL_Procedures.html
Run it quickly a few times and you will see the below exception on the console -

Exception in thread "Thread-2" java.lang.NullPointerException
at javax.swing.text.CompositeView.replace(CompositeView.java:200)
at javax.swing.text.BoxView.replace(BoxView.java:164)
at javax.swing.text.CompositeView.loadChildren(CompositeView.java:97)
at javax.swing.text.CompositeView.setParent(CompositeView.java:122)
at javax.swing.text.html.BlockView.setParent(BlockView.java:55)
at javax.swing.text.CompositeView.replace(CompositeView.java:200)
at javax.swing.text.BoxView.replace(BoxView.java:164)
at javax.swing.text.html.TableView$RowView.replace(TableView.java:1457)
at javax.swing.text.CompositeView.loadChildren(CompositeView.java:97)
at javax.swing.text.CompositeView.setParent(CompositeView.java:122)
at javax.swing.text.CompositeView.replace(CompositeView.java:200)
at javax.swing.text.BoxView.replace(BoxView.java:164)
at javax.swing.text.html.TableView.replace(TableView.java:896)
at javax.swing.text.CompositeView.loadChildren(CompositeView.java:97)
at javax.swing.text.CompositeView.setParent(CompositeView.java:122)
at javax.swing.text.html.TableView.setParent(TableView.java:800)
at javax.swing.text.CompositeView.replace(CompositeView.java:200)
at javax.swing.text.BoxView.replace(BoxView.java:164)
at javax.swing.text.View.updateChildren(View.java:1095)
at javax.swing.text.View.insertUpdate(View.java:679)
at javax.swing.text.View.forwardUpdateToView(View.java:1186)
at javax.swing.text.View.forwardUpdate(View.java:1161)
at javax.swing.text.BoxView.forwardUpdate(BoxView.java:223)
at javax.swing.text.View.insertUpdate(View.java:685)
at javax.swing.plaf.basic.BasicTextUI$RootView.insertUpdate(BasicTextUI.java:1589)
at javax.swing.plaf.basic.BasicTextUI$UpdateHandler.insertUpdate(BasicTextUI.java:1848)
at javax.swing.text.AbstractDocument.fireInsertUpdate(AbstractDocument.java:185)
at javax.swing.text.DefaultStyledDocument.insert(DefaultStyledDocument.java:206)
at javax.swing.text.html.HTMLDocument.insert(HTMLDocument.java:417)
at javax.swing.text.html.HTMLDocument$HTMLReader.flushBuffer(HTMLDocument.java:3704)
at javax.swing.text.html.HTMLDocument$HTMLReader.flush(HTMLDocument.java:2506)
at javax.swing.text.html.HTMLEditorKit.read(HTMLEditorKit.java:231)
at javax.swing.JEditorPane.read(JEditorPane.java:556)
at javax.swing.JEditorPane.read(JEditorPane.java:584)
at javax.swing.JEditorPane$PageLoader.run(JEditorPane.java:647)