jar file won't run

Why is it that whenever i run my program using eclipse it works fine but whenever i export a jar file of it, it doesn't run at all?It does not even give an error message and this happens for only one specific class, all the others expoort perfectly
[263 byte] By [cypher_19a] at [2007-11-26 13:42:10]
# 1
Probably either 1) the jar file is not located where it should be, or 2) the jar file does not have (or it's incorrect) a manifest file.Since you don't give any useful diagnostic information, hard to tell more.
ChuckBinga at 2007-7-7 23:59:40 > top of Java-index,Java Essentials,Java Programming...
# 2
what useful diagnostic information do you need?
cypher_19a at 2007-7-7 23:59:40 > top of Java-index,Java Essentials,Java Programming...
# 3
never mind i found what the problem was (sorta) but it works now
cypher_19a at 2007-7-7 23:59:40 > top of Java-index,Java Essentials,Java Programming...