gwt get previous searching criteria

there is a paenl for user input searching criteria, when user press a
button, the searching criteria is send to server for retrieve record,
then return back and create a new panel to show the result. In
traditional jsp1 - servlet - jsp2, the searching criteria is stored in
session and then when user return to searching page, the searching
page will load the previous inputted searching criteria stored in
session, in GWT, how to do this seems simple task?

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