JasperReports Server ignores time when parameter is of tipe java.util.Data

I creates a simple report that receives a date as parameter and prints it in a text field.

If my parameter is of type java.util.Date, the report is correctly generated on Jasper Studio, but JasperReport Server ignored the time part of the date.

Changing the parameter's type to java.sql.Timestamp makes it work in both.

It is related to this question in the community Answers: http://community.jaspersoft.com/questions/906131/time-part-date-being-ignored-parameter-shown-textfield