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can mybatis mapper have array return type?

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Can mybatis mapper have array return type?
I've query like select dept_no from employee where emp_id in (1,2) which returns two rows.
mapper.xml has following
<select id="getDeptNo" resultType="int">
SELECT dept_no FROM employee
where ticker in
<foreach item="item" index="index" collection="array" open="("
separator="," close=")">

And in the mapper class , can I've
public int[] getDeptNo(String[] empId);

When I try this , it is throwing an exception java.lang.ClassCastException: [I incompatible with [Ljava.lang.Object;

I've to declare the returnType to "Integer" and have the mapper class declaration as public List<Integer> getDeptNo(String[] empId);

Why I can not get the array?
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