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Problem in obtaining collection of parameters onto my backing bean

vish som
Posts: 10
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Hi All,
I am working on a page 'browse.jsp' to implement a customization in the Alfresco CMS wherin in the "details" view, inclusion of checkboxes besides the document names and their checking and submission will result in thier display in a subsequent JSP.
Here is my code snippet from line no 411 of 'browse.jsp' is my backing bean.

Here is my backing bean BeanForSendMultiple

and here are the getters and setters for the document

But on running the application i am getting the following stack trace: The issue being a NullPointer exception in obtaining documentDetails.length from the BeanForSendMultiple

Could any one please guide me on my approach where i am missing out.
Thank You
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