There used to be a program called BeanShell that tried to provide a REPL for Java, but it was not as nice as the REPLs offered by, e.g. Python or Ruby (Let alon

There used to be a program called BeanShell that tried to provide a REPL for Java, but it was not as nice as the REPLs offered by, e.g. Python or Ruby (Let alone Lisps where the debugger is integrated into the REPL). OTOH, I looked at it years ago, so maybe it has gotten better (or it stagnated completely).