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That's a pretty neat tool that I haven't seen before. I poked around at the backend code, and it basically works by running your code in a sandboxed JVM, attaching a custom debugger, and recording a snapshot of the stack frame and everything that it references after every line of code.
Mozilla has developed a fancy tool called rr that can enable this kind of debugging by using some fancy techniques to do essentially record incremental snapshots. Unfortunately, it's designed for C/C++ programs, and I don't think you can easily use it to debug Java code that runs inside of a JVM.