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Showing content from https://github.com/pmd/pmd/issues/2684 below:

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Affects PMD Version: 6.26.0 (and 6.27.0-SNAPSHOT)

Rule: UnusedAssignment

Description:
A method-call within a try-block might fail and its result shouldn't be treated as a guaranteed assignment.

Code Sample demonstrating the issue:

public class Foo {

    public int foo() {
        int a = 0; // <--- false-positive UnusedAssignment
        try (Reader r = new StringReader("")) {
            a = r.read(); // might assign or fail
            a = r.read(); // might assign or fail
        } catch (IOException e) {
        }
        return a;
    }

}

Expected outcome:

• Both the first and second read might fail. All assignments to the variable a are useful, depending on whether one of the read()'s fails -> false-positive

Running PMD through: Other

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