The Eclipse Project has released AspectJ 1.2.1. AspectJ is a derivative of Java that allows programmers to write code that applies across multiple classes. The AspectJ compiler requires Java 1.3 but can generate code for Java 1.1 and later. According to the announcement, "AspectJ 1.2.1 contains an updated version of the JDT Java compiler, a number of tools improvements, runtime performance optimisations, the ability to split declare error/warning messages across several lines using the '+' operator, and numerous bug fixes."