jsp and sessions

while retriving array from session i am getting ClassCastException .how to resolve this error.

snipet code is as

for(int i=0;i<bmdto.length;i++)

session.setAttribute("books",bmdto);

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BookMaster bmdto[]=(BookMaster[])session.getAttribute("books");>

[306 byte] By [tirupati_Da] at [2007-9-24]