Here is how I achieved my task successfully.
I have created a new servlet and trigger an AJAX call as below. Then I set comboboxvalue
to session from servlet.
this._on( this.input, {
autocompleteselect: function( event, ui ) {
$.ajax({
type: 'POST',
url: 'AjaxServlet',
dataType : 'json',
data: { comboboxvalue : ui.item.value }
});
ui.item.option.selected = true;
this._trigger( "select", event, {
item: ui.item.option
});
},
autocompletechange: "_removeIfInvalid"
});