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final local variable

Submitted by lithium4 on Tue, 07/27/2010 - 09:46.
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I'm learning JSF 2.0 now i always see in sources similar syntax when in in method local reference type variable is declared final.
For what ?
like in mojarra-2.0.3-FCS-source\jsf-ri\src\main\java\com\sun\faces\application\view\StateManagementStrategyImpl.java in method restoreView :

final StateContext stateContext = StateContext.getStateContext(
if (null != state) {
final Application app = context.getApplication();

The code above is here http://pastie.org/1062089

Thx