Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8254557

Compiler crashes with java.lang.AssertionError: isSubtype UNKNOWN

    XMLWordPrintable

    Details

    • Subcomponent:
    • Introduced In Version:
      11
    • Resolved In Build:
      b21
    • CPU:
      x86_64
    • OS:
      windows_10
    • Verification:
      Verified

      Description

      ADDITIONAL SYSTEM INFORMATION :
      Dell Latitude 7490 running Windows 10. This reproduces on the most recent releases of JDK 14, 15, and 16-ea. It does not reproduce on the most recent JDK 13 release.

      A DESCRIPTION OF THE PROBLEM :
      Attempting to compile this simple Java file results in a compiler exception: java.lang.AssertionError: isSubtype UNKNOWN. Full stack trace below.

      package com.labkey;

      import java.sql.ResultSet;
      import java.util.Iterator;
      import java.util.function.Function;
      import java.util.stream.Stream;

      public class Main
      {
          public static void main(String[] args)
          {
          }

          public <T> Stream<T> stream(Class<T> clazz)
          {
              return stream(rs->{
                  if (null != clazz)
                  {
                      return new Iterator<>()
                      {
                          @Override
                          public boolean hasNext()
                          {
                              return true;
                          }

                          @Override
                          public T next()
                          {
                              return null;
                          }
                      };
                  }
                  else
                  {
                      return new Iterator<>()
                      {
                          @Override
                          public boolean hasNext()
                          {
                              return true;
                          }

                          @Override
                          public T next()
                          {
                              return null;
                          }
                      };
                  }
              });
          }

          private static <T> Stream<T> stream(Function<ResultSet, Iterator<T>> function)
          {
              return null;
          }
      }


      REGRESSION : Last worked in version 13

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Execute "javac Main.java" on the source code file above

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      A successful compilation (or appropriate error)
      ACTUAL -
      An exception has occurred in the compiler (15). Please file a bug against the Java compiler via the Java bug reporting page (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com) for duplicates. Include your program, the following diagnostic, and the parameters passed to the Java compiler in your report. Thank you.
      java.lang.AssertionError: isSubtype UNKNOWN
              at jdk.compiler/com.sun.tools.javac.code.Types$4.visitType(Types.java:1123)
              at jdk.compiler/com.sun.tools.javac.code.Types$4.visitType(Types.java:1100)
              at jdk.compiler/com.sun.tools.javac.code.Type.accept(Type.java:227)
              at jdk.compiler/com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:4862)
              at jdk.compiler/com.sun.tools.javac.code.Types.isSubtype(Types.java:1096)
              at jdk.compiler/com.sun.tools.javac.code.Types.isSubtypeUncheckedInternal(Types.java:1022)
              at jdk.compiler/com.sun.tools.javac.code.Types.isSubtypeUnchecked(Types.java:1008)
              at jdk.compiler/com.sun.tools.javac.code.Types.isConvertible(Types.java:607)
              at jdk.compiler/com.sun.tools.javac.code.Types.isAssignable(Types.java:2327)
              at jdk.compiler/com.sun.tools.javac.comp.Check$1.compatible(Check.java:569)
              at jdk.compiler/com.sun.tools.javac.comp.Check.checkType(Check.java:610)
              at jdk.compiler/com.sun.tools.javac.comp.Check.checkType(Check.java:597)
              at jdk.compiler/com.sun.tools.javac.comp.Annotate.attributeAnnotationValues(Annotate.java:476)
              at jdk.compiler/com.sun.tools.javac.comp.Annotate.attributeAnnotation(Annotate.java:432)
              at jdk.compiler/com.sun.tools.javac.comp.Annotate.annotateNow(Annotate.java:341)
              at jdk.compiler/com.sun.tools.javac.comp.Annotate.lambda$annotateLater$0(Annotate.java:267)
              at jdk.compiler/com.sun.tools.javac.comp.Annotate.flush(Annotate.java:191)
              at jdk.compiler/com.sun.tools.javac.comp.Annotate.unblockAnnotations(Annotate.java:144)
              at jdk.compiler/com.sun.tools.javac.comp.TypeEnter.complete(TypeEnter.java:217)
              at jdk.compiler/com.sun.tools.javac.code.Symbol.complete(Symbol.java:681)
              at jdk.compiler/com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1409)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.visitClassDef(Attr.java:957)
              at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:790)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:665)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStat(Attr.java:739)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.visitAnonymousClassDefinition(Attr.java:2794)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.lambda$visitAnonymousClassDefinition$20(Attr.java:2752)
              at jdk.compiler/com.sun.tools.javac.comp.InferenceContext.notifyChange(InferenceContext.java:266)
              at jdk.compiler/com.sun.tools.javac.comp.InferenceContext.notifyChange(InferenceContext.java:257)
              at jdk.compiler/com.sun.tools.javac.comp.Infer.instantiateMethod(Infer.java:242)
              at jdk.compiler/com.sun.tools.javac.comp.Resolve.rawInstantiate(Resolve.java:610)
              at jdk.compiler/com.sun.tools.javac.comp.Resolve.checkMethod(Resolve.java:649)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.checkMethod(Attr.java:4618)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.checkIdInternal(Attr.java:4410)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.checkMethodIdInternal(Attr.java:4311)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.checkId(Attr.java:4300)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.visitIdent(Attr.java:4050)
              at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCIdent.accept(JCTree.java:2419)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:665)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.visitApply(Attr.java:2401)
              at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1745)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:665)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.visitReturn(Attr.java:2262)
              at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCReturn.accept(JCTree.java:1657)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:665)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStat(Attr.java:739)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStats(Attr.java:757)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1435)
              at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1047)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:665)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStat(Attr.java:739)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1225)
              at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:893)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:665)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStat(Attr.java:739)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:5270)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.attribClass(Attr.java:5161)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.attribClass(Attr.java:5001)
              at jdk.compiler/com.sun.tools.javac.comp.Attr.attrib(Attr.java:4946)
              at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1344)
              at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:973)
              at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:317)
              at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:176)
              at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:59)
              at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:45)

      CUSTOMER SUBMITTED WORKAROUND :
      Switching both "Iterator<>" references to "Iterator<T>" in the code results in a successful compilation

      FREQUENCY : always


        Attachments

          Issue Links

            Activity

              People

              Assignee:
              mcimadamore Maurizio Cimadamore
              Reporter:
              webbuggrp Webbug Group
              Votes:
              0 Vote for this issue
              Watchers:
              4 Start watching this issue

                Dates

                Created:
                Updated:
                Resolved: