Now I use wicket 1.3.5.

There is a date field in my webpage.and it is not required.
The date class type is java.sql.date

But I alway have a NullPointerException while the input of this optional
field is empty.
the exceptions below:
Caused by: java.lang.NullPointerException
        at
org.apache.wicket.util.convert.converters.SqlDateConverter.convertToObject(SqlDateConverter.java:35)
        at
org.apache.wicket.markup.html.form.FormComponent.convertInput(FormComponent.java:1211)
...

How do I fix this problem?
Now I must set a date into my date filed  to pass the program.But this field
is not required.
Thanks.
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