hashmap with struts and jsp

hashmap with struts and jsp

i am trying to use hash map in struts.I am inserting on class object as value and string as key.This object is of class type like UserMaster{username,userId.....}.My problem is that its working fine upto 140 records but if i fech more than 400 record from database my browser gets hang.
Can any one tell me the best approch for handling such situaltion

thanx

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