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POWhat's a good low-impact way for me to preserve this expensive data structure?
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copied!<p>I'm working with mature production code written using Java EE. To deal with an unusual data condition, I've inserted a sanity check that works, but is adding some unnecessary cost. The architecture works like this:</p> <ol> <li>On Page 1, user selects an item from a list and clicks the Go button.</li> <li>An Ajax call to Page 1's view-scoped controller bean creates a Big Expensive Data Object (BEDO), which it then sanity checks to make sure it's valid.</li> <li>If the BEDO is valid, Page 1 forwards itself via Javascript to Page 2.</li> <li>Page 2's view-scoped backing bean creates a new copy of the BEDO, identical to the one used for the sanity check.</li> </ol> <p>I'm creating the same BEDO twice, and simply throwing away the first one. I'd like to figure out a solution that wastes fewer processing cycles.</p> <p>So my question is, what's the best low-impact way of getting the BEDO from Page 1's controller bean to Page 2's backing bean? Giving Page 1's controller access to the backing bean doesn't work; because Page 2's backing bean is view-scoped, it gets created anew when the user actually gets sent to Page 2.</p> <p>I could change the scope of Page 2's backing bean, but I'd rather not. Because this is mature production code, I'm very wary of introducing regression errors. That's what I mean by "low-impact"; I don't want to fool around with the existing architecture any more than I have to.</p>

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