I think your point about separating DB I/O and screen I/O could be
expanded to a discussion of writing modular code in general, and
especially placing reusable code in callable components instead of
embedding the same code in many applications. I think we've become
better at this than, say 20 years ago, but in Web applications I've seen
being placed in a common source directory and referenced from HTML
Another problem I've seen with J2EE applications in particular is that
common code files are deployed in every application directory instead of
being placed in a global directory and referenced from the application.
I'm not sure what it is about J2EE, but there seems to be a tendency to
deploy many applications in a single application directory, which leads
to huge WAR files and related ANT scripts.
I don't want to ignite a language or platform war, but maybe I can say
in an ambiguous way that the most classic trap I've witnessed, and the
one that ends up costing the most, and being the most frustrating, are
the broadly scoped efforts to migrate applications off the System i, or
rewrite everything to work under platform agnostic runtime environments.
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