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  1. JDK
  2. JDK-8056984

Exception in compiler: java.lang.AssertionError: isSubClass T

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    Details

    • Subcomponent:
    • Resolved In Build:
      b31
    • CPU:
      x86_64
    • OS:
      linux
    • Verification:
      Verified

      Backports

        Description

        FULL PRODUCT VERSION :
        java version "1.8.0_20"
        Java(TM) SE Runtime Environment (build 1.8.0_20-b26)
        Java HotSpot(TM) 64-Bit Server VM (build 25.20-b23, mixed mode)

        ADDITIONAL OS VERSION INFORMATION :
        Linux io.tomosw.bruker.de 3.7.10-1.40-desktop #1 SMP PREEMPT Thu Jul 10 11:22:12 UTC 2014 (9b06319) x86_64 x86_64 x86_64 GNU/Linux

        A DESCRIPTION OF THE PROBLEM :
        Assertion in javac while compiling classes which compiled fine using jdk8u5

        REGRESSION. Last worked in version 8u5

        ADDITIONAL REGRESSION INFORMATION:
        java version "1.8.0_05"
        Java(TM) SE Runtime Environment (build 1.8.0_05-b13)
        Java HotSpot(TM) 64-Bit Server VM (build 25.5-b02, mixed mode)

        STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
        Compile the three files A.java, B.java and C.java

        javac A.java B.java C.java

        EXPECTED VERSUS ACTUAL BEHAVIOR :
        EXPECTED -
        The files are compiled without errors.
        ACTUAL -
        A java.lang.AssertionError is thrown in the compiler

        ERROR MESSAGES/STACK TRACES THAT OCCUR :
        An exception has occurred in the compiler (1.8.0_20). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport) after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report. Thank you.
        java.lang.AssertionError: isSubClass T
        at com.sun.tools.javac.code.Symbol.isSubClass(Symbol.java:447)
        at com.sun.tools.javac.code.Symbol.isMemberOf(Symbol.java:456)
        at com.sun.tools.javac.code.Symbol$MethodSymbol.overrides(Symbol.java:1469)
        at com.sun.tools.javac.code.Types$ImplementationCache.implementationInternal(Types.java:2671)
        at com.sun.tools.javac.code.Types$ImplementationCache.get(Types.java:2653)
        at com.sun.tools.javac.code.Types.implementation(Types.java:2682)
        at com.sun.tools.javac.code.Symbol$MethodSymbol.implementation(Symbol.java:1529)
        at com.sun.tools.javac.code.Symbol$MethodSymbol.implementation(Symbol.java:1518)
        at com.sun.tools.javac.comp.Resolve.notOverriddenIn(Resolve.java:416)
        at com.sun.tools.javac.comp.Resolve.isAccessible(Resolve.java:402)
        at com.sun.tools.javac.comp.Resolve.isAccessible(Resolve.java:362)
        at com.sun.tools.javac.comp.Resolve.selectBest(Resolve.java:1448)
        at com.sun.tools.javac.comp.Resolve.findMethodInScope(Resolve.java:1618)
        at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1710)
        at com.sun.tools.javac.comp.Resolve.findMethod(Resolve.java:1662)
        at com.sun.tools.javac.comp.DeferredAttr$DeferredChecker$2.lookup(DeferredAttr.java:1325)
        at com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3325)
        at com.sun.tools.javac.comp.Resolve.lookupMethod(Resolve.java:3310)
        at com.sun.tools.javac.comp.DeferredAttr$DeferredChecker.quicklyResolveMethod(DeferredAttr.java:1333)
        at com.sun.tools.javac.comp.DeferredAttr$DeferredChecker.visitApply(DeferredAttr.java:1223)
        at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465)
        at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
        at com.sun.tools.javac.comp.DeferredAttr$FilterScanner.scan(DeferredAttr.java:901)
        at com.sun.tools.javac.comp.DeferredAttr.isDeferred(DeferredAttr.java:1088)
        at com.sun.tools.javac.comp.Attr.attribArgs(Attr.java:701)
        at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1834)
        at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
        at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:656)
        at com.sun.tools.javac.comp.Attr.visitExec(Attr.java:1611)
        at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1296)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676)
        at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:692)
        at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1142)
        at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:909)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676)
        at com.sun.tools.javac.comp.Attr.visitForeachLoop(Attr.java:1207)
        at com.sun.tools.javac.tree.JCTree$JCEnhancedForLoop.accept(JCTree.java:1035)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676)
        at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:692)
        at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1142)
        at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:909)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676)
        at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1035)
        at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:778)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676)
        at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4342)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4252)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4181)
        at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4156)
        at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1248)
        at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:901)
        at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:860)
        at com.sun.tools.javac.main.Main.compile(Main.java:523)
        at com.sun.tools.javac.main.Main.compile(Main.java:381)
        at com.sun.tools.javac.main.Main.compile(Main.java:370)
        at com.sun.tools.javac.main.Main.compile(Main.java:361)
        at com.sun.tools.javac.Main.compile(Main.java:56)
        at com.sun.tools.javac.Main.main(Main.java:42)

        REPRODUCIBILITY :
        This bug can be reproduced always.

        ---------- BEGIN SOURCE ----------
        A.java
        ======

        import java.util.*;

        public class A<T extends B & C<T>> extends B {
            private final List<T> tList;
            public A(List<T> tList) {
                this.tList = new LinkedList<>();
                for (T t : tList) {
                    // If the following two lines are used instead of the third line
                    // this class compiles with jdk8u20 as well
                    // final T tClone = t.clone("");
                    // this.tList.add(tClone);
                    this.tList.add(t.clone(""));
                }
            }

            public T clone(String s) {
                return null;
            }
        }


        B.java
        ======

        public abstract class B {
            protected B() {
            }
        }


        C.java
        ======

        public interface C<T> {
            public T clone(String s);
        }
        ---------- END SOURCE ----------

        CUSTOMER SUBMITTED WORKAROUND :
        I added a comment in A.java how the source can be modified to make it compile with 8u20 as well.

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                Assignee:
                jlahoda Jan Lahoda
                Reporter:
                webbuggrp Webbug Group
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                  Dates

                  Created:
                  Updated:
                  Resolved: