The problem

The newer arrow (->) syntax for switches is preferred to the older colon (:) syntax. The main reason for continuing to use the colon syntax in switch statements is that it allows fall-through from one statement group to the next. But in a switch expression, fall-through would only be useful if the code that falls through has side effects. Burying side effects inside a switch expression makes code hard to understand.

Suppression

Suppress false positives by adding the suppression annotation @SuppressWarnings("TraditionalSwitchExpression") to the enclosing element.