ClassCastException with JDK7U5 while using Iterator.

Hi All,
While i am trying to iterate through a raw Collection (without generics) which contains my business objects using Iterator. It is throwing ClassCastException when i am casting the Iterator's next value with expected object.
but when i replace Iterator with for(int i=0; i<collection.size();i++) loop its working fine and i am able to iterate the collection without any exception and i am able to cast my object with expected class type.
I am not sure why this is happening with JDK1.7u5 while the same code(with iterator) works fine in JDK1.6u31.
Please suggest me the solution or workaround for the same.
Thanks .

show your code.

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