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  1. JDK
  2. JDK-8145738

ClassCastException in javac from Elements#getTypeElement

    Details

    • Type: Bug
    • Status: Closed
    • Priority: P4
    • Resolution: Duplicate
    • Affects Version/s: 7u80
    • Fix Version/s: None
    • Component/s: tools
    • Subcomponent:
    • CPU:
      x86
    • OS:
      os_x

      Description

      FULL PRODUCT VERSION :
      java version "1.7.0_80"
      Java(TM) SE Runtime Environment (build 1.7.0_80-b15)
      Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)

      ADDITIONAL OS VERSION INFORMATION :
      OS X 10.10.5
      Darwin Kernel Version 14.5.0

      A DESCRIPTION OF THE PROBLEM :
      Appears to be fixed in Java 8. But I have a case where an annotation processor is calling Elements#getTypeElement for a type that does not exist. The method is specified to return null in this case. But instead, it throws an exception:

      java.lang.ClassCastException: com.sun.tools.javac.comp.Resolve$SymbolNotFoundError cannot be cast to com.sun.tools.javac.code.Symbol$ClassSymbol
      at com.sun.tools.javac.comp.Attr$IdentAttributer.visitMemberSelect(Attr.java:313)
      ...

      I've included a repro trivial case in "Steps to Reproduce" below.


      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      See source code in four files total under "Source code for an executable test case" section.

      Compile the annotation and the processor:
      > javac Repro.java ReproProcessor.java

      Compile the test class and observe exception:
      > javac Basic.java


      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      The method should return null instead of throwing.
      ACTUAL -
      Exception is thrown:

      java.lang.ClassCastException: com.sun.tools.javac.comp.Resolve$SymbolNotFoundError cannot be cast to com.sun.tools.javac.code.Symbol$ClassSymbol
      at com.sun.tools.javac.comp.Attr$IdentAttributer.visitMemberSelect(Attr.java:313)
      ...

      ERROR MESSAGES/STACK TRACES THAT OCCUR :
      java.lang.ClassCastException: com.sun.tools.javac.comp.Resolve$SymbolNotFoundError cannot be cast to com.sun.tools.javac.code.Symbol$ClassSymbol
      at com.sun.tools.javac.comp.Attr$IdentAttributer.visitMemberSelect(Attr.java:313)
      at com.sun.tools.javac.comp.Attr$IdentAttributer.visitMemberSelect(Attr.java:302)
      at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1683)
      at com.sun.tools.javac.comp.Attr.attribIdent(Attr.java:298)
      at com.sun.tools.javac.main.JavaCompiler.resolveIdent(JavaCompiler.java:672)
      at com.sun.tools.javac.model.JavacElements.nameToSymbol(JavacElements.java:162)
      at com.sun.tools.javac.model.JavacElements.getTypeElement(JavacElements.java:144)
      at com.sun.tools.javac.model.JavacElements.getTypeElement(JavacElements.java:61)
      at ReproProcessor.process(ReproProcessor.java:16)
      at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:793)
      at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:722)
      at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1700(JavacProcessingEnvironment.java:97)
      at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1029)
      at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1163)
      at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1108)
      at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:824)
      at com.sun.tools.javac.main.Main.compile(Main.java:439)
      at com.sun.tools.javac.main.Main.compile(Main.java:353)
      at com.sun.tools.javac.main.Main.compile(Main.java:342)
      at com.sun.tools.javac.main.Main.compile(Main.java:333)
      at com.sun.tools.javac.Main.compile(Main.java:76)
      at com.sun.tools.javac.Main.main(Main.java:61)

      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      Four files in total:

      META-INF/services/javax.annotation.processing.Processor:
      ---------------------------------------
      ReproProcessor
      ---------------------------------------


      Repro.java:
      ---------------------------------------
      import java.lang.annotation.Retention;
      import java.lang.annotation.RetentionPolicy;

      @Retention(RetentionPolicy.RUNTIME)
      public @interface Repro {
      }
      ---------------------------------------


      ReproProcessor.java:
      ---------------------------------------
      import java.util.Set;
      import javax.annotation.processing.AbstractProcessor;
      import javax.annotation.processing.RoundEnvironment;
      import javax.annotation.processing.SupportedAnnotationTypes;
      import javax.lang.model.SourceVersion;
      import javax.lang.model.element.TypeElement;

      @SupportedAnnotationTypes("Repro")
      public class ReproProcessor extends AbstractProcessor {

        @Override public SourceVersion getSupportedSourceVersion() {
          return SourceVersion.latestSupported();
        }

        @Override public boolean process(Set<? extends TypeElement> types, RoundEnvironment env) {
          processingEnv.getElementUtils().getTypeElement("Basic.Foo.Bar");
          return false;
        }
      }
      ---------------------------------------


      Basic.java
      ---------------------------------------
      class Basic {
        static class A { A() { } }
        static class Foo$Bar {
          Foo$Bar() { }
          static class Baz { Baz() { } }
        }
        @Repro
        static class AModule { }
      }
      ---------------------------------------

      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      Update annotation processor to catch exceptions thrown by Elements#getTypeElement and treat as if null return value.

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              • Assignee:
                fmatte Fairoz Matte
                Reporter:
                webbuggrp Webbug Group
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                Dates

                • Created:
                  Updated:
                  Resolved: