This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Please verify which jar does the class belong to. You can do Ctrl+Shift+T in Eclipse and type in the class name, it will display the jar it belongs to. Verify that the jar is present in the java build path in your Eclipse.
Right click on the project, Go to Properties -> Java Build Path -> Libraries.