Editing ArrayList of objects with struts 2 form tag

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If you want to send back to Action a list of objects you need to specify an index in the name attribute:

instead of

<s:iterator value="courseList">
   <s:textfield name="marks" />
</s:iterator>

use 

<s:iterator value="courseList" status="ctr">
   <s:textfield name="courseList[%{#ctr.index}].marks" />
</s:iterator>

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