How do I restart apex without restarting the database?

As the title says... How do I restart apex without restarting the database?
For the second time in as many weeks apex 3.0.1(?) has stopped working while the database (10gR2) hasn't missed a beat.
How do I restart apex?
How do I get it to restart automatically on failure.
How do I receive failure notification messages.
How do I diagnose the cause of the failure.
We were looking at using apex in a production environment but the prospect of unplanned restarts of production databases every week is a little daunting.
Regards,
David

David,
>> We're not using oracle http server as it's a 64 bit version so yes the whole thing is running within the database.
1) So your Web server is the XDB HTTP protocol server and embedded PL/SQL gateway (basically, the database's embedded Web server)? Is this 11g? If so, what platform?
2) Are there any reported issues in the database alert log?
3) When you check the status of the database listener, does it show services running for this specific port (default 8080, I guess)?
4) If you normally go to http://server:port/apex, when this situation occurs, what happens when you try and go to http://server:port?
Joel

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