Multi environment aware debugger

A computer program product comprising a computer readable storage medium having program code stored thereon, the program code executable by a processor to perform a method comprising:

• initiating, by the processor, a stepwise execution of a first instance of an application in a first computing environment hosted by a first data processing system and, in parallel, initiating the stepwise execution of a second instance of the application in a second computing environment hosted by a second data processing system, wherein the second computing environment is different than the first computing environment;
• responsive to an execution step being performed by the first instance of the application and the second instance of the application, determining, by the processor, whether a first data set generated by an operation performed in the execution step by the first instance of the application matches a second data set generated by the operation performed in the execution step by the second instance of the application;
• responsive to determining that the first data set does not match the second data set, replacing, by the processor, in memory of the second data processing system, the second data set with the first data set;
• responsive to at least one additional execution step being performed by the first instance of the application and the second instance of the application, determining, by the processor, whether a third data set generated by at least one additional operation performed in the at least one additional execution step by the first instance of the application matches a fourth data set generated by the at least one additional operation performed in the at least one additional execution step by the second instance of the application;
• and
• responsive to determining that the third data set matches the fourth data set, outputting, by the processor, an indication that the operation that generated the fourth data set performed properly.