Frequently Asked Questions for JDT.
- Java Development in Eclipse - The Official Eclipse FAQs
- Java Development Tools - IRC FAQ
The navigation bar is called Breadcrumb, to disable the breadcrumb invoke Toggle Java Editor Breadcrumb in the toolbar or press Alt+Shift+B in the Java editor. More details on the Java editor breadcrumb can be found in Eclipse help.
Java Development Tool API - The Official Eclipse FAQs