In Maven projects, you can specify additional properties to be passed to Maven goals in the "Set Properties:" input on the "Actions" page.  However, the text isn't escaped properly, which causes exceptions to be thrown and the nbactions.xml file to be butchered.  For example, if you try to add the property:

foo="bar"

(with the quotes), an IllegalNameException is thrown and the nbactions.xml file is created blank.  This later causes a parse exception when trying to reload the project.  Even more madness ensues if you're foolish enough to try to use a backslash or a "<".  Please escape the properties (and unescape when displaying them again) so that what you specify to the right of the "=" is verbatim what you get (including any quotes and leading spaces).