JAVA not running- overlaid with BlueJ

I am a newbie to programming. I have the latest version of Java 7 running in windows 7 on a 64 bit system. My version is overlaid with BlueJ. Everything worked fine for awhile and now Java will not run from the BlueJ interface. I have verified that Java is running on the computer. I have cleared the cache (java cache) and still no luck. Can anyone please help a beginning beginner?

Thanks.