As of a few years ago someone was working on such a system for the JVM and had gotten quite some distance. Here it is: http://www.lambdacs.com/debugger/ http:/

As of a few years ago someone was working on such a system for the JVM and had gotten quite some distance. Here it is: http://www.lambdacs.com/debugger/ http://www.lambdacs.com/debugger/ A Google search https://www.google.com/search?q=java+backwards+debugger https://www.google.com/search?q=java+backwards+debugger found some more hits.