1. No Exception propagation - Catch the exception & say e.printStackTrace(), irrespective of the depth of the call ().
2. Suppress the exception at the inner most methods & return null.
Most of this mistake occurs project over project, irrespective of the amount of experience a developer has. I felt this happens because of 2 reasons,
1. Not understanding the way the java exception stack trace is build & the critical importance of exception propagation.
2. Messy, meaningless compile time exception :) over Run-time exception (Obviously this is a bigger topic to debate).
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