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PostHeaderIcon Sonar / Dead store of null to local variable

How to fix the Sonar’s following report?

Dodgy - Dead store of null to local variable

Remove assignments at null of local variables that will not be read. Since Java 6, they have no interest and no effect on garbage collector.
Eg: remove the last assignment, in the line#4

void foo(){
    String goo = "hello world";
    (...)
    goo = null;
}

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