OS: Windows 7 Ultimate (64 bit)
History: Have been using IDE Version 16. Yesterday upgraded to Version 22. Everything worked fine. Loaded and compiled the rather large sketch I have been working on, uploaded to the Mega board, ran. No problems.
This morning I rebooted the machine and when I load the sketch I get the following error (in the first window that opens when you start the IDE):
java.lang.NoClassDefFoundError: Could not initialize class gnu.io.RXTXCommDriver thrown while loading gnu.io.RXTXCommDriver
When I try to compile the sketch I get a Compile Error and garbage in the lower window.
Everything works just fine still in Version 16.
I suspect I need to change versions of Java (I have the java folder in V16 renamed so it won't be used). Am I right and if so how do I do that?