Java JDK版本eclipse Blackboard 9.1 java.lang.UnsupportedClassVersionError

I have successfully implemented and deployed a hello world project adding a admin Example Admin Tool. I did this after having to correct all version of JRE/JDK to 1.6 in 3 places in eclipse (project, ant, and general eclipse java setting). Now I'm trying to compile a project given to us by an external contractor (which is working in .war format). I want to extend the project myself. The project has axis jars in it etc and references the blackboard jars and although it compiles in eclipse, upon deployment to Bb and running it I get get: java.lang.UnsupportedClassVersionError Ive tried to compile in JDK 1.7 and I also get an error. It seems related to versions - which JDK version should i be using for Bb 9.1? Can anyone shed any light? full errors: com/streaming/SearchManagerI have successfully implemented and deployed a