nmatt opened a new issue, #9168:
URL: https://github.com/apache/netbeans/issues/9168
### Apache NetBeans version
Apache NetBeans 28
### What happened
Example:
```java
class Example
{
public void testA() { doIt(this::methodA); }
private void methodA(String unusedA) { System.out.println("A"); }
// warning here: ^^^^^^^
interface Interface { void method(String param); }
static void doIt(Interface impl) { impl.method("test"); }
public void testB() { doIt(this::methodB); }
void methodB(String unusedB) { System.out.println("B"); }
public void testC() { doIt(unusedC -> { System.out.println("C"); }); }
public void testD() { doIt(implD); }
private final Interface implD = unusedD -> { System.out.println("D"); };
public void testE() { doIt(implE); }
private final Interface implE = new Interface() { @Override public void
method(String unusedE) { System.out.println("E"); } };
public void testF() { doIt(new Interface() { @Override public void
method(String unusedF) { System.out.println("F"); } }); }
}
```
Parameter `unusedA` incorrectly shows a warning "Variable unusedA is never
read".
For comparison, parameter `unusedB` correctly does _not_ show the warning,
even though `methodB` isn't otherwise used in the packacke. Cases C to F
illustrate further variations of providing an interface implementations where
correctly also no warning is shown for the unused parameters.
A method reference effectively turns the referenced method definition into
the implementation of an abstract method. Unused parameters in implementations
of abstract methods generally do not cause a warning, because it is normal that
not all implementations need all parameters. Therefore one would expect there
to be no warning here either, in presence of a method reference.
### Language / Project Type / NetBeans Component
Java, Hints
### How to reproduce
See example above.
### Did this work correctly in an earlier version?
No / Don't know
### Operating System
Windows
### JDK
JDK 21
### Apache NetBeans packaging
Apache NetBeans binary zip
### Anything else
_No response_
### Are you willing to submit a pull request?
No
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