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  1. JDK
  2. JDK-8247680

Compilation throws when passing invalid method reference to generic parameter

    Details

    • Subcomponent:
    • Introduced In Version:
      12
    • CPU:
      x86_64
    • OS:
      windows_10

      Description

      A DESCRIPTION OF THE PROBLEM :
      javac throws a NullPointerException when attempting to compile code where a method reference to a method that does not exist is passed as the argument to a method where the parameter type is a type parameter of the method's containing generic type.

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Put the source code in a file MethodReferenceBug.java.
      Run javac MethodReferenceBug.java.

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      An error message explaining where the error is in my code and what the problem is.
      ACTUAL -
      An exception has occurred in the compiler (15-ea). 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.NullPointerException
              at jdk.compiler/com.sun.tools.javac.comp.Flow$FlowAnalyzer.visitApply(Flow.java:1383)
              at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1745)
              at jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
              at jdk.compiler/com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:440)
              at jdk.compiler/com.sun.tools.javac.tree.TreeScanner.visitExec(TreeScanner.java:219)
              at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1532)
              at jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
              at jdk.compiler/com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:440)
              at jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:57)
              at jdk.compiler/com.sun.tools.javac.comp.Flow$FlowAnalyzer.visitBlock(Flow.java:1131)
              at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:1047)
              at jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
              at jdk.compiler/com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:440)
              at jdk.compiler/com.sun.tools.javac.comp.Flow$FlowAnalyzer.visitMethodDef(Flow.java:1097)
              at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:893)
              at jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
              at jdk.compiler/com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:440)
              at jdk.compiler/com.sun.tools.javac.comp.Flow$FlowAnalyzer.visitClassDef(Flow.java:1060)
              at jdk.compiler/com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:790)
              at jdk.compiler/com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
              at jdk.compiler/com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:440)
              at jdk.compiler/com.sun.tools.javac.comp.Flow$FlowAnalyzer.analyzeTree(Flow.java:1476)
              at jdk.compiler/com.sun.tools.javac.comp.Flow$FlowAnalyzer.analyzeTree(Flow.java:1466)
              at jdk.compiler/com.sun.tools.javac.comp.Flow.analyzeTree(Flow.java:218)
              at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1404)
              at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1378)
              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:57)
              at jdk.compiler/com.sun.tools.javac.Main.main(Main.java:43)
      printing javac parameters to: C:\dev\javaBug\javac.20200607_012834.args

      ---------- BEGIN SOURCE ----------
      import java.lang.Runnable;
      import java.util.function.Consumer;

      public class MethodReferenceBug
      {
        public static void a(Consumer<Runnable> consumer)
        {
          consumer.accept(MethodReferenceBug::missing);
        }
      }

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

      FREQUENCY : always


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              • Assignee:
                vromero Vicente Arturo Romero Zaldivar
                Reporter:
                webbuggrp Webbug Group
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                Dates

                • Created:
                  Updated:
                  Resolved: