Self assignment of local variable detectedJAVA-E0291

A local variable is assigned to itself.

This is essentially a noop but it may be indicative of a different problem. It may be that the variable shadows another in a parent scope, or that the variable may shadow a field of the object itself. Such code can cause confusion and subtle logic errors that are hard to catch.

Bad Practice

public void foo() {
    int x = 3;
    int y = someInt;
    // ...
    x = x; // Useless self assignment.
}

Recommended

Always check that the correct variable is being assigned to (or from)

public void foo() {
    int x = 3;
    int y = someInt;
    // ...
    y = x; // Here, we assign x to y.
}

Check if you meant to assign a field or another local variable with a similar name instead.