Exception in thread "main" java.lang.UnsupportedClassVersionError解决办法

Exception in thread "main" java.lang.UnsupportedClassVersionError
小弟最近遇到个错误,
'Exception   in   thread   -
"main "java.lang.UnsupportedClassVersionError ',望高手们赐教!

[解决办法]
jbuilder？
http://blog.chinaitlab.com/user1/20817/archives/2005/35245.html