Month: Juni 2015

Strong IDs

Posted on by Paul Sterl

In some projects you may encounter the so called „strong id pattern“. What is it? Strong IDs are simply wrapped primitive or simple types into classes. Just remember what we did in Java before the Enum come around. We had just Strings or Numbers in the code which we used to assign well known values…

JSR 303 Validation for Dates

Posted on by Paul Sterl

A common case is to validate date inputs in Java e.g. to avoid the nice and friendly typos like 06/01/1500. Nevertheless by default where is not to much support to handle this very common case. So let’s fix this together: Annotation first The first we need is a JSR annotation which we use to annotate…