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.
First you add the JScrollPane containing the JTextArea to the window (correct) and then you add the bare JTextArea itself in the same position, effectively removing the JScrollPane from the window (wrong.) Just delete the second line above.