Setup of support structure for J2EE systems running on Oracle App Servers

I'm not sure if this is the best place to pose this question, but I can' really think of anywhere better. Apologies to anyone who may be reading this and thinking 'what does this guy think he's doing!'
Over the last two years, we have been implementing a number of J2EE systems for a large insurance company. The way we have been supporting these systems, is by making a number of senior staff available to field any issues. We are talking about DBAs, Oracle App Server admins, and senior Java staff (generally the same individuals as the Oracle App Server admins). Now, we do have an on-call support roster, but because our developers are generally not environment savvy they are not suitable for on-call support. They know the code inside out (for their particular application) but have not been exposed to the environment and possibly other applications running there in.
So since it is not feasible, or fair, to ask developers to go oncall, it is left to us poor saps (generally myself and a DBA in the States). This problem will only get worse as time goes on: the more applications added to the environment, the more complex the support requirements, the less available developers are to do frontline support.
So my questions are:
Has anyone faced this kind of a problem before?
What kind of an individual is most suitable for frontline support?
What structures could be put in place to address this problem?
What tools do people use to help them in frontline support of their J2EE systems?
In my mind, a suitable candidate needs, at the very least the following skills:
Knowledge of Unix commands
Working knowledge of Oracle AS, various OC4j instances, config files, deployment structure etc.
Good, not necessarily expert level, of Java. Someone who can make sense of a stack trace at least.
Awareness of the enterprise, not just the application servers but all constituent parts in the application i.e. database, ldaps, external hosts etc.
Thanks much in advance to anyone who can offer any advice on this topic.

Jason,
You said:
So since it is not feasible, or fair, to ask developers to go oncallActually, in my experience, developers are always "oncall". In the company that I work for, a developer can be contacted whenever and asked to help with some support issue.
Good Luck,
Avi.

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