Strange Parameter index out of range error

Hello,

      I'm encountering a persistent error. I'm trying to use a 
parameter map inside my application. Here goes:
<parameterMap id="studentMap" class="com.mafoi.bats.Student">
       <parameter property="id"/>
       <parameter property="name"/>
       <parameter property="dob"/>
       <parameter property="doe"/>
       <parameter property="streamId"/>
       <parameter property="batchId"/>
       <parameter property="photo" javaType="com.mafoi.bats.Image" 
jdbcType="bytea"/>
   </parameterMap>
  
   <insert id="insertStudent" parameterMap="studentMap">
       insert into students (id, name, dob, doe, stream_id, batch_id, 
photo)
       values (#id#, #name#, to_date(#dob#, 'DD/MM/YYYY'),
       to_date(#doe#, 'DD/MM/YYYY'), #streamId#, #batchId#, #photo#)
   </insert>

This seems perfectly alright to me, but I'm getting this exception:

javax.servlet.ServletException:   
--- The error occurred in com/mafoi/bats/Student.xml.  
--- The error occurred while applying a parameter map.  
--- Check the studentMap.  
--- Check the parameter mapping for the 'id' property.  
--- Cause: org.postgresql.util.PSQLException: Parameter index out of range.
        
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:516)
[...]

As you can see, I don't think there is anything wrong with the mapping. 
the "Student" class getter/setter or the "id" variable, and it is an 
int. I'm using a custom type handler for "photo" property. Can it be the 
problem? I'm lost. Please help.
TIA,
Vamsee.