[java] ShortVariable false positive for java 22 unnamed variable `_`

[emouty]

Affects PMD Version:

Rule: ShortVariable

Description:
_ is being flagged as shortvariable

Code Sample demonstrating the issue:

 switch (myValue) {
        case FirstClass _ -> throw new IllegalStateException("");
		case SecondClass _ -> System.out.print("I'm in second class");
		}

Expected outcome:

_ should not be flagged as short variable since its a special variable name

Running PMD through: Maven | PMD Intellij plugin

[adangel]

Thanks for the report.
Btw - the feature is available since Java 22 and is called Unnamed Variable. See JEP 456: Unnamed Variables & Patterns for details.