When system locale is set to sv_SE.UTF-8 there are test failures in the build due to changed date formatting in DateTimePickerTag.
testDateParsing(org.apache.struts2.dojo.views.jsp.ui.DateTimePickerTagTest) Time elapsed: 0.094 sec <<< FAILURE!
junit.framework.AssertionFailedError: expected:<2007> but was:<6>
I do not use the dojo plugin but this breaks my builds and is probably a bug that causes issues in deployements as well.
Workaround: Set LANG=en_US.UTF-8