Handling an critical object if it is down

Hi,
In our J2EE web application we have so many critical functionality which is handled by various component. Say if one of the critical object or the respective critical system is down. How we can serve the request and still get the response from those systems? How this can be handled technically through code? I know we can go for service virtualization and create a system which will emulate the behavior of critical object or system. But for that we need to use the respective tools which is quite costly. How the same can be handled using java code , whether we can create a clone of that critical object and still serve the request eventhough the origibal critical object is down or can we create a proxy of that critical object? How we can handle it in java through code? Please clarify.
Thanks.

800839 wrote:
But for that we need to use the respective tools which is quite costly.
This should be a simple calculation:
What are the costs for losing that critical resource (temorary)?
How much will a comercial solution be (eg. Oracle RAC or Failover)
How much will a self coded solution cost?
That is:
how much efford is to be made by your developer(s)?
how expensive is it to keep the only person knowing that solution in your company (eg for extensions or bugfixes)?
how much will it cost if this solution does not work when needed?
In the long run cheap solutions tent to be quite expensive...
bye
TPD

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