A DESCRIPTION OF THE PROBLEM :
JavaDoc of index parameter of method JTabbedPane.insertTab(String title, Icon icon, Component component, String tip, int index) incorrectly states that index must be greater than 0, when in fact it may be 0.

Currently: index - the position to insert this new tab (> 0 and <= getTabCount())
Must be: index - the position to insert this new tab (>= 0 and <= getTabCount())