I am working on build automation of oracle SOA 11 g application with jenkins 1.596.3 and java 1.6.24 and web logic 10.3.5.

https://wiki.jenkins-ci.org/display/JENKINS/Weblogic

After deploying the war file called jenkins into web logic results

Caused by: java.lang.UnsupportedClassVersionError: hudson/WebAppMain : Unsupported major.minor version 51.0,

yes I understood that it's because of different java versions but my system is configured with 1.6.24 jdk.

As I don't have any prior knowledge of jenkins, I started to backtrack everything,
extracting all files from war file (jenkins) and I checked the classes compiler version by using javap command then the output was version 47 means jdk 1.3.

I don't have source to recompile those classes from jenkins..

Is it the cause for that compatibility issue ?? or anything else ?

Any help would be greatly appreciated TIA

PS:- I cant upgraded to java 7 or 8 because of dependency with web logic 10.3.5 which does not support java 7/8.
I did everything in the same way which was mentioned in that URL.