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This is a performance issue reported by Findbugs. A StringBuffer can be used for achieving better performance.
When I said open bugs for findbugs issues I meant BUGS. I am not going to change code that uses +. It reads better and it is not high impact code by any means - it only calls ones when prefers stored. Same about other "inefficiencies" such as keySet iterator.
Thanks for clarifying:) I'll report real bugs.