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Showing content from https://github.com/pmd/pmd/issues/2759 below:

[java] False positive in UnusedAssignment · Issue #2759 · pmd/pmd · GitHub

Affects PMD Version:

6.27.0

Description:

The UnusedAssignment rule claims the decrement of a is unused. The if clauses are necessary to provoke the bug. If only

try {
  return somethingThatCanThrowRandomly(1);
} ...

is used, there is no false positive.

Code Sample demonstrating the issue:

class Test {
    int a() {
        int a = 10; 
        while (a > 0) {
            a--;
            try {
                if (dummy) {
                    return somethingThatCanThrowRandomly(1);
                } else {
                    return somethingThatCanThrowRandomly(2);
                }   
            } catch (RuntimeException e) {
                // retry
            }   
        }
        return 0;
    }   
}

Steps to reproduce:

pmd pmd -d srcdir -rulesets category/java/bestpractices.xml

Running PMD through:

CLI / Gradle

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