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  1. JDK
  2. JDK-8054210

NullPointerException when compiling specific code.

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    Details

    • Subcomponent:
    • Resolved In Build:
      b31
    • CPU:
      x86_64
    • OS:
      windows_7
    • Verification:
      Verified

      Backports

        Description

        FULL PRODUCT VERSION :
        java version "1.8.0_11"
        Java(TM) SE Runtime Environment (build 1.8.0_11-b12)
        Java HotSpot(TM) 64-Bit Server VM (build 25.11-b03, mixed mode)

        ADDITIONAL OS VERSION INFORMATION :
        Microsoft Windows [Version 6.1.7601]

        A DESCRIPTION OF THE PROBLEM :
        It might be related to JDK-8042741, however my problem still exists in jdk8u20 EA but exception is different.

        ADDITIONAL REGRESSION INFORMATION:
        The problem was first observed with EA builds of Java 8 (before official release of jdk8).

        I did not have clue what part of code it was but now I know.

        STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
        Compile attached code:

        javac TooMuchForACompiler.java

        EXPECTED VERSUS ACTUAL BEHAVIOR :
        EXPECTED -
        Code compiles successfully (or produces reasonable error message).
        ACTUAL -
        NullPointerException in a compiler

        ERROR MESSAGES/STACK TRACES THAT OCCUR :


        Error message for jdk8u11 (official release)


        java.lang.NullPointerException
                at com.sun.tools.javac.comp.Flow$AbstractAssignAnalyzer.trackable(Flow.java:1476)
                at com.sun.tools.javac.comp.Flow$AbstractAssignAnalyzer.visitVarDef(Flow.java:1801)
                at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitVarDef(Flow.java:2516)
                at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:846)
                at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
                at com.sun.tools.javac.comp.Flow$BaseAnalyzer.scan(Flow.java:389)
                at com.sun.tools.javac.comp.Flow$AbstractAssignAnalyzer.scan(Flow.java:1367)
                at com.sun.tools.javac.comp.Flow$AbstractAssignAnalyzer.visitLambda(Flow.java:2225)


        Error message for jdk8u20 EA:

        java.lang.NullPointerException
                at com.sun.tools.javac.code.Scope.includes(Scope.java:296)
                at com.sun.tools.javac.comp.Flow$1.trackable(Flow.java:247)
                at com.sun.tools.javac.comp.Flow$AbstractAssignAnalyzer.visitVarDef(Flow.java:1832)
                at com.sun.tools.javac.comp.Flow$AssignAnalyzer.visitVarDef(Flow.java:2569)



        REPRODUCIBILITY :
        This bug can be reproduced always.

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

        public class TooMuchForACompiler {

            public interface Supplier<T, E extends Exception> {
                T get() throws E;
            }

            public static <T, E extends Exception> T produceAndConsume(Supplier<T, E> supplier, Consumer<E> handler) {
                try {
                    return supplier.get();
                } catch (Exception e) {
                    handler.accept((E) e);

                }
                return null;
            }

            public static void main(String... args) {
                produceAndConsume(() -> -1, i -> System.out.println(i.getMessage()));
            }

        }
        ---------- END SOURCE ----------

        CUSTOMER SUBMITTED WORKAROUND :
        Assign one of lambdas to a variable.

         public static void main(String... args) {
                Supplier<Integer, RuntimeException> supplier = () -> -1;
                produceAndConsume(supplier, i -> System.out.println(i.getMessage()));
            }

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                Assignee:
                pgovereau Paul Govereau (Inactive)
                Reporter:
                webbuggrp Webbug Group
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                  Created:
                  Updated:
                  Resolved: