If you're using SQL Maps 2.0, then here's what you want to do (in
order of importance):

1. Ensure you've specified a parameterMap or parameterClass attribute
on your statement.

2. Use an explicitly defined <resultMap> and DON'T allow remapping of
results (new 2.0.9 feature)

3. Use a Java``Bean (not a Map or XML etc.)

4. Make sure all of your properties are "simple properties" (no
dot.notation, array[] access or mixed bean/map properties).

5. Try enabling bytecode enhancement in your <settings> element.