<div>Example:</div>
<div> </div>
<div>pageA.java</div>
<div> </div>
<div>private String nameA;</div>
<div> </div>
<div>pageB.java</div>
<div> </div>
<div>private String nameB;</div>
<div> </div>
<div>(doesn't contain nameA)</div>
<div> </div>
<div>htmlA->htmlB->htmlA</div>
<div> | |</div>
<div>nameA="A" nameA=null</div>
<div> </div>
<div>In a word , i can't save nameA in pageA after jump from htmlA to htmlB and return to htmlA.(pageB doesn't contain nameA property)</div>
<div> </div>
<div>what should i do if i want to save nameA without defining nameA in pageB.</div>