Sometime you just need to test some external libraries – how they work. In Java I was always creating some file, compile it and test, then I want to change something, compile, test. Not comfortable at all!! Today I had a need to check how Joda-time library working with periods, to test correctness of implementation of iso8601 in Erlang. Surprisingly, I found an article about
jrunscript (my bad that I didn't knew about it, but maybe somebody else don't know either).
With this tool it was quite easy to experiment with Joda-time library:
jrunscript -cp ./joda-time-1.6.jar
js; var date = new DateTime("2010-01-31");
js; var oneMonthAndSecond = new Period().withMonths(1).withSeconds(1);
It is usable when you want to debug regular expression, test some new library,…