Affects PMD Version:
7.3.0
Rule: UnusedPrivateMethod
Description:
private method referenced by method reference operators not getting detected as used
this::mymethod
Code Sample demonstrating the issue:
package com.mytest;
import jakarta.validation.ConstraintViolation; //imported from jakarta.validation:jakarta.validation-api:3.0.2
import java.util.List;
import java.util.Set;
public class UnusedPrivateMethodFalsePositive {
//this does not trigger UnusedPrivateMethod
private void doWork(List obj) {
obj.toString();
}
public void execute(Set<List<?>> listOfLists) {
listOfLists.forEach(this::doWork);
}
//BUT this does???
//UnusedPrivateMethod - this as a false positive - but what is different?
private void addValidationError(ConstraintViolation constraintViolation) {
constraintViolation.toString();
}
public void addValidationErrors(Set<ConstraintViolation<?>> constraintViolations) {
constraintViolations.forEach(this::addValidationError);
}
}
Expected outcome:
It is not an unused private method
PMD reports a violation at line ..., but that's wrong. That's a false positive.
UnusedPrivateMethodFalsePositive.java:19: UnusedPrivateMethod: Avoid unused private methods such as 'addValidationError(ConstraintViolation)'.
Running PMD through: [CLI | Ant | Maven | Gradle | Designer | Other]
Maven AND cli both report it
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