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  1. JDK
  2. JDK-8060483

NPE with explicitCastArguments unboxing null

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Details

    • Bug
    • Resolution: Fixed
    • P2
    • 9
    • 8u40, 9
    • core-libs
    • None
    • b37
    • generic
    • generic
    • Verified

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      Description

        package jdk.nashorn.test.models;

        import java.lang.invoke.MethodHandle;
        import java.lang.invoke.MethodHandles;
        import java.lang.invoke.MethodType;

        public class NullProvider {
            public static Boolean getBoolean() { return null; }

            public static void main(String[] args) throws Throwable {
                MethodHandle mh = MethodHandles.lookup().findStatic(NullProvider.class, "getBoolean", MethodType.methodType(Boolean.class));
                mh = MethodHandles.explicitCastArguments(mh, MethodType.methodType(boolean.class));
                System.out.println(mh.invoke());
            }
        }

        throws:

        Exception in thread "main" java.lang.NullPointerException
        at sun.invoke.util.ValueConversions.unboxBoolean(ValueConversions.java:95)
        at jdk.nashorn.test.models.NullProvider.main(NullProvider.java:13)

        Expected result would be printing "false", as per documentation for explicitCastArgument that says "If T0 is a reference and T1 a primitive, and if the reference is null at runtime, a zero value is introduced."

        This happens with 9 builds (e.g. just reproduced it with 9 b34). 8 builds (e.g. recent 8u40 early access release builds) seem to behave okay.

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                vlivanov Vladimir Ivanov
                attila Attila Szegedi
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                  Created:
                  Updated:
                  Resolved: