#25 strange effect when use freemarker's map with date

[Anonymous]

I have a map container in my action.
The map's key type is string ,value type is java.util.Date.

I input a blank value into the map from freemarker's template file (ftl).
in struts2's action, this input date value is null.
but back to the ftl file after action.It become the value of today.

And if you put date value in list containor or use it single.
The result in comeback flt of this blank value is still blank .

Just date in map have strange effect.

[Nobody/Anonymous]

The test project.