Even with modern software development methodologies, the actual debugging of source code, i.e., location and identification of errors in the program when errant behavior is encountered during testing, remains a crucial part of software development. To apply model-based diagnosis techniques which have long been state of the art in hardware diagnosis, for automatic debugging a model of a given program must be automatically created from the source code. This work describes a model that reflects the sequential execution semantics of the Java language, including exceptions and unstructured control flow, therby providing unprecedented scope in the application of model-based diagnosis to programs. Notably, this approach omits the strict view of a component representing one statement of earlier work and provides a more flexible mapping from code to model.