1. Java gets Generics! Java 1.5
2. Learn to use an IDE Eclipse
3. More testing needed JUnit + MockObjects
4. AOP is cool AspectJ / Aspectwerkz
5. Yet another application framework Spring
6. O/R mapping tool Hibernate
7. Measuring with Hyades
8. Building languages for the JVM with ANTLR + BCEL
9. Building Java code with Ant + CruiseControl
10. Automating busy work with XDoclet
11. Scripting Java with BSF Languages

Whadda ya know! A one off error.