Hi Jason, Greenfoot 2.1 will run fine on Java 7, but you may get a dialog when you start it saying something along the lines "Can't find required dll msvcr100.dll; application will terminate" - the message however is harmless, Greenfoot will continue to run just fine. We'll be putting out a new Greenfoot release to fix this some time soon. (When it's ready). You can also prevent the error message by copying the msvcr100.dll file from the JDK into the Greenfoot folder (where Greenfoot is installed). Davin

On top of what Davin's said, it may also be worth mentioning that the current editor will probably flag up any new Java 7 syntax as invalid (since it was in Java 6!) Things like the diamond syntax (probably the most likely), string switch, underscores in integers, autoclosable stuff etc. It'll still compile and run fine however :)

Hi guys. I had JDK 7 installed with Greenfoot 2.1. First it gave me the dll error. So I added the file then it just did not want to start. So finally I installed JDK 6.25 and now it works.

Hi Robin, It should still work fine despite the DLL error (and in the next version of Greenfoot this will be fixed anyway.) Was this not the case for you?