We're often presented with cases where a crash in the compiler isn't reproducible either because of rarity or because of lack of access to a test bed but we often have a core file from the crash. in those cases it would be useful to be able to replay a compile given the class files and some description of the state of the compiler interface at the point of a crash. This can be recovered from a core file using the serviceability agent or could be dumped by the JVM when it crashes.