#181 clearDocument: NullPointerException

[HowUpDoHighKnee]

If you didn't load any Document into HtmlPanel but trying to call clearDocument, the Programm throws a NullPointerException!
The Problem is in HtmlPanel.class (l.278) :

private void clearDocumentImpl() {
HTMLDocumentImpl prevDocument = (HTMLDocumentImpl) this.rootNode;
if(prevDocument != null) {
...
}

The Code checks if it is null but first tries to cast it to HTMLDocumentImpl! Here the NullPointerException is throwen!
It has to be for example:

private void clearDocumentImpl() {
if (this.rootNode != null) {
HTMLDocumentImpl prevDocument = (HTMLDocumentImpl) this.rootNode;
if(prevDocument != null) {
prevDocument.removeDocumentNotificationListener(this.notificationListener);
}
}
...
}

[HowUpDoHighKnee]

I forgot, that you have to write

...
private volatile NodeImpl rootNode = null;
...

instead of

...
private volatile NodeImpl rootNode;
...

otherwise

public NodeImpl getRootNode() {
return this.rootNode;
}

throths a NullPointerException too!