Reasons and advantages for upgrading to Java 6 for a non-technical decider (at the client)

Question

I\'d like to upgrade from Java 5 to Java 6. We all know about the technical advantages and benefits, but:

I have the problem that a major client refuses to upgrade f

Answer 1

Rather than convince him that there are no risks, I would suggest instead working with him to come up with a risk mitigation strategy.

In other words, agreeing that if you can show that the system running under Java 6 passes tests X, Y and Z he'll be happy to upgrade.