The Green Language Exception System

Exception systems have become popular because they uncouple error detection and handling thus allowing us to produce better software. However, the exception handling systems of many object-oriented languages benefit very little from object-oriented programming. The catch clauses following a try block are isolated pieces of code: they do not belong to classes and cannot be reused. This paper presents the object-oriented exception system of the Green language, which fully uses the objectoriented programming features. That includes the use of classes, types and subtyping, objects, and inheritance. The result is a powerful exception system completely integrated with the language.