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  1. NetBeans
  2. NETBEANS-3791

Unclear use of Java hint: “Illegal Use of instanceOf operator”

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    Details

    • Type: Improvement
    • Status: Open
    • Priority: Minor
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: java - Hints
    • Labels:
    • Environment:
      JDK 8 project, NetBeans running on JDK 13

      Description

      In an annotation processor similar to

      @SupportedAnnotationTypes("org.example.MyAnnotation")
      public final class MyGenerator 
              extends javax.annotation.processing.AbstractProcessor {
          @Override
          public boolean process(
                  final Set<? extends TypeElement> annotations,
                  final RoundEnvironment roundEnvironment) {
              final Set<? extends Element> elements
                      = roundEnvironment.getElementsAnnotatedWith(MyAnnotation.class);
              for (final Element element : elements) {
                  PackageElement packageElement = null;
                  for (Element currentElement = typeElement;
                          currentElement != null;
                          currentElement = currentElement.getEnclosingElement()) {
                      if (currentElement instanceof PackageElement) { // Illegal Use of instanceOf
                          packageElement = (PackageElement) currentElement;
                          break;
                      }
      

      I get the warning “Illegal Use of instanceOf operator” (in the line with the comment). It is unclear why this use would be illegal, as it works fine.

      The description of the hint in the options should clearly say why it’s illegal to use instanceOf or, if this warning is obsolete, the hint should be removed.

      (According to http://wiki.netbeans.org/Java_Hints, this hint is disabled by default.)

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            • Assignee:
              jlahoda Jan Lahoda
              Reporter:
              striderapache dennis lucero
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              Dates

              • Created:
                Updated: