do not rely on default encoding
CatalogItem is never null
CatalogItem is never null
values are never null
do not expose internal representation
prevent possible NPE
remove unused variables/imports
ignore findbugs warning
use efficient entrySet insteaf of inefficient keySet
ignore findbugs warning
close connection
add delete check, remove unnecessary try/catch
ignore findbugs warning
Merge pull request #1077 from dennishendriksen/master

Resolve FindBugs warnings