Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8226561

javac throws NullPointerException in Check.checkClassOverrideEqualsAndHash

    Details

    • Subcomponent:
    • Introduced In Build:
      b02
    • Introduced In Version:
      11
    • CPU:
      x86_64
    • OS:
      generic

      Description

      ADDITIONAL SYSTEM INFORMATION :
      I don't think any of this is relevant. but

      DISTRIB_ID=Ubuntu
      DISTRIB_RELEASE=18.04
      DISTRIB_CODENAME=bionic
      DISTRIB_DESCRIPTION="Ubuntu 18.04.2 LTS"
      NAME="Ubuntu"
      VERSION="18.04.2 LTS (Bionic Beaver)"
      ID=ubuntu
      ID_LIKE=debian
      PRETTY_NAME="Ubuntu 18.04.2 LTS"
      VERSION_ID="18.04"
      HOME_URL="https://www.ubuntu.com/"
      SUPPORT_URL="https://help.ubuntu.com/"
      BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
      PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
      VERSION_CODENAME=bionic
      UBUNTU_CODENAME=bionic

      Linux bruce-VirtualBox 4.15.0-52-generic #56-Ubuntu SMP Tue Jun 4 22:49:08 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

      (ubuntu running on virtualbox on Windows 10 enterprise host)

      java version "12.0.1" 2019-04-16
      Java(TM) SE Runtime Environment (build 12.0.1+12)
      Java HotSpot(TM) 64-Bit Server VM (build 12.0.1+12, mixed mode, sharing)

      (also openjdk version "11.0.3" 2019-04-16
      OpenJDK Runtime Environment (build 11.0.3+7-Ubuntu-1ubuntu218.04.1)
      OpenJDK 64-Bit Server VM (build 11.0.3+7-Ubuntu-1ubuntu218.04.1, mixed mode)
      )

      but not on java version "1.8.0_192"
      Java(TM) SE Runtime Environment (build 1.8.0_192-b12)
      Java HotSpot(TM) 64-Bit Server VM (build 25.192-b12, mixed mode)


      A DESCRIPTION OF THE PROBLEM :
      Compiling code containing an anonymous class declaration with undefined superclass, used as an argument to a method call with an undefined target, which itself is an argument to a (known) method call and with the -Xlint:all option causes javac to throw a NullPointerException in jdk.compiler/com.sun.tools.javac.comp.Check.checkClassOverrideEqualsAndHash()

      REGRESSION : Last worked in version 8u192

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      javac '-Xlint:all' JavacNpeInducer.java

      with JavacNpeInducer.java as per 'Source code for an executable test case' below.

      The this.equals() method call specifically is not required though some method call is. Originally it was List.add() but this.equals() also causes the failure and means no imports are required in the code.

      The key cause seems to be -Xlint:all and an anonymous class declaration with undefined superclass, used as an argument to a method with an undefined target, which itself is an argument to a (known) method call.

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      from java 1.8_192

      src/JavacNpeInducer.java:4: error: cannot find symbol
                  undefined_SYMBOL.someMethod(new UndefinedClass() {})
                                                  ^
        symbol: class UndefinedClass
        location: class JavacNpeInducer
      src/JavacNpeInducer.java:4: error: cannot find symbol
                  undefined_SYMBOL.someMethod(new UndefinedClass() {})
                  ^
        symbol: variable undefined_SYMBOL
        location: class JavacNpeInducer
      2 errors

      ACTUAL -
      An exception has occurred in the compiler (12.0.1). 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 and the following diagnostic in your report. Thank you.
      java.lang.NullPointerException
      at jdk.compiler/com.sun.tools.javac.comp.Check.checkClassOverrideEqualsAndHash(Check.java:2090)
      at jdk.compiler/com.sun.tools.javac.comp.Check.checkClassOverrideEqualsAndHashIfNeeded(Check.java:2080)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4778)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4704)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.visitClassDef(Attr.java:964)
      at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:780)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:664)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStat(Attr.java:737)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.visitAnonymousClassDefinition(Attr.java:2582)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.visitNewClass(Attr.java:2473)
      at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCNewClass.accept(JCTree.java:1764)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:664)
      at jdk.compiler/com.sun.tools.javac.comp.ArgumentAttr.visitNewClass(ArgumentAttr.java:328)
      at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCNewClass.accept(JCTree.java:1764)
      at jdk.compiler/com.sun.tools.javac.comp.ArgumentAttr.attribArg(ArgumentAttr.java:199)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:662)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribArgs(Attr.java:764)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.visitApply(Attr.java:2182)
      at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1709)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:664)
      at jdk.compiler/com.sun.tools.javac.comp.DeferredAttr.attribSpeculative(DeferredAttr.java:501)
      at jdk.compiler/com.sun.tools.javac.comp.DeferredAttr.attribSpeculative(DeferredAttr.java:484)
      at jdk.compiler/com.sun.tools.javac.comp.ArgumentAttr.lambda$processArg$0(ArgumentAttr.java:222)
      at jdk.compiler/com.sun.tools.javac.comp.ArgumentAttr.processArg(ArgumentAttr.java:244)
      at jdk.compiler/com.sun.tools.javac.comp.ArgumentAttr.processArg(ArgumentAttr.java:221)
      at jdk.compiler/com.sun.tools.javac.comp.ArgumentAttr.visitApply(ArgumentAttr.java:315)
      at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1709)
      at jdk.compiler/com.sun.tools.javac.comp.ArgumentAttr.attribArg(ArgumentAttr.java:199)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:662)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribArgs(Attr.java:764)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.visitApply(Attr.java:2182)
      at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1709)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:664)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:715)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.visitExec(Attr.java:1860)
      at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1519)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:664)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStat(Attr.java:737)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStats(Attr.java:756)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1307)
      at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1026)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:664)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStat(Attr.java:737)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1111)
      at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:872)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribTree(Attr.java:664)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribStat(Attr.java:737)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4884)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4775)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4704)
      at jdk.compiler/com.sun.tools.javac.comp.Attr.attrib(Attr.java:4649)
      at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1341)
      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:311)
      at jdk.compiler/com.sun.tools.javac.main.Main.compile(Main.java:170)
      at jdk.compiler/com.sun.tools.javac.Main.compile(Main.java:57)
      at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:43)

      (also for 11.0.3)

      ---------- BEGIN SOURCE ----------
      public class JavacNpeInducer {
          public void aMethod() {
              this.equals(
                  undefined_SYMBOL.someMethod(new UndefinedClass() {})
              );
          }
      }

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

      CUSTOMER SUBMITTED WORKAROUND :
      1/ Fix the imports in the code so that the symbols are no longer undefined.

      2/ Or don't compile with -Xlint:all

      FREQUENCY : always


        Attachments

          Issue Links

            Activity

              People

              • Assignee:
                vromero Vicente Arturo Romero Zaldivar
                Reporter:
                webbuggrp Webbug Group
              • Votes:
                0 Vote for this issue
                Watchers:
                2 Start watching this issue

                Dates

                • Created:
                  Updated: