Store Previous SelectedValue from selectOneListbox

[bokalas]

I need quite a simple solution to implement this.I need to store a value which I selected in JSF selectOneListbox drop down and need to preserve this value in bean. So everytime when user selects a new value, the one value I should be checking with new value in drop down. How best is this to do this using session?Any java solutions to preserve the previous selected value?I tried ValueChangeEvent oldValue is not working because my scope is request and that's why I am looking for alternate methods. My JSF version is 1.1