[GitHub] [netbeans] sviperll opened a new issue, #4260: Throwable values used as switch argument are considered unused

[GitBox <gi...@apache.org>]

sviperll opened a new issue, #4260:
URL: https://github.com/apache/netbeans/issues/4260

   ### Apache NetBeans version
   
   Apache NetBeans 14
   
   ### What happened
   
   Throwable values used as arguments of a switch-statement (with pattern matching) are considered unused.
   
   ````java
   Throwable cause = ...; // WARNING: unused local variable
   switch (cause) {
       case IOException ex -> throw ex;
       case Throwable ex -> throw new UnexpectedException(ex);
   }
   ````
   
   similar behavior is observed when throwable-returning methods are used:
   
   ````java
   try {
   } catch (InvocationTargetException ex) {
       switch (ex.getCause()) { // WARNING: the result of throwable returning method is ignored
           case IOException ex -> throw ex;
           case Throwable ex -> throw new UnexpectedException(ex);
       }
   }
   ````
   
   I expect that no warning are generated in both cases, because the values are actually used.
   
   ### How to reproduce
   
   Any code written with JDK 18 that follows the pattern described above forces NetBeans to generate warnings/hints.
   
   ### Did this work correctly in an earlier version?
   
   No
   
   ### Operating System
   
   Fedora 34
   
   ### JDK
   
   JDK 18
   
   ### Apache NetBeans packaging
   
   Apache NetBeans binary zip
   
   ### Anything else
   
   The problem is stable and occurs all the time.
   
   ### Are you willing to submit a pull request?
   
   No
   
   ### Code of Conduct
   
   Yes


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