1. After setting up the default comment, sometimes you find it does not take effect. The solution to this is to select Window --> Preferences --> Java --> Code Style, and tick "Automatically add comments for new methods and types".
2. When you install eclipse plugins to measure software metrics, you need to enable it first in the Property page of the project.
3. When you want to update your JRE from 1.4 to 1.5 in Eclipse, just modify Window --> Preferences --> Java --> Build Path does not suffice. You also need to modify Window --> Preferences --> Java --> compiler to make it compatible with Java 5.0.