public ActivateLinkAction(String actionName) 
{
            super(actionName);
}

Create this action with the appropriate identifier.

 public  void actionPerformed(ActionEvent e) 
{
            JTextComponent c = getTextComponent(e);
            if (c.isEditable() || !(c instanceof JEditorPane)) {
                return;
            }
            JEditorPane editor = (JEditorPane)c;
            Document d = editor.getDocument();
            if (d == null || !(d instanceof HTMLDocument)) {
                return;
            }
            HTMLDocument doc = (HTMLDocument)d;
            ElementIterator ei = new ElementIterator(doc);
            int currentOffset = editor.getCaretPosition();
            // invoke the next link or object action
            String urlString = null;
            String objString = null;
            Element currentElement = null;
            while ((currentElement = ei.next()) != null) {
                String name = currentElement.getName();
                AttributeSet attr = currentElement.getAttributes();
                Object href = getAttrValue(attr, HTML.Attribute.HREF);
                if (href != null) {
                    if (currentOffset  >= currentElement.getStartOffset() &&
                        currentOffset < = currentElement.getEndOffset()) {
                        activateLink((String)href, doc, editor, currentOffset);
                        return;
                    }
                } else if (name.equals(HTML.Tag.OBJECT.toString())) {
                    Object obj = getAttrValue(attr, HTML.Attribute.CLASSID);
                    if (obj != null) {
                        if (currentOffset  >= currentElement.getStartOffset() &&
                            currentOffset < = currentElement.getEndOffset()) {
                            doObjectAction(editor, currentElement);
                            return;
                        }
                    }
                }
            }
}