migrate from JAVA 1.3.1_09 to latest version

I had a program from supplier called Minestar that run on java 1.3.1_09 and I would like to upgrade it to the latest version. Will the code on java latest version compatible with previous version ?
[204 byte] By [ARIYADIa] at [2007-10-3 1:09:39]
# 1
There will not be any problem in upgrading java version. Mostly it will work. But there is always possibilitry some of the APIs might have deprecated, i.e. changed / will not be available in this version.
j_pravina at 2007-7-14 18:06:33 > top of Java-index,Desktop,Runtime Environment...