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  1. JDK
  2. JDK-8273790

Potential cyclic dependencies between Gregorian and CalendarSystem

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    • b17
    • generic
    • generic
    • Verified

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      Description

        We find cyclic dependencies between Gregorian and CalendarSystem classes in our test environment when using JDK11 AOT(It also affects JDK tip).

        The class hierarchies are as follows(w/ some simplifications):

        ```
        class GregorianCalendar {
        static Gregorian base = CalendarSystem.getGregorianCalendar();
        }

        class Gregorian extends BaseCalendar { }
        class BaseCalendar extends AbstractCalendar {}
        class AbstractCalendar extends CalendarSystem {}

        public class CalendarSystem {
        Gregorian GREGORIAN_INSTANCE = new Gregorian();
        }
        ```

        We create two new threads to link GregorianCalendar and AbstractCalendar, respectively.

        T1: new GregorianCalendar()
        GregorianCalendar -> Gregorian -> BaseCalendar -> AbstractCalendar -> CalendarSystem

        T2: Unsafe.ensureInitialized(AbstractCalendar.class)
        AbstractCalendar -> CalendarSystem -> Gregorian

        What would next happen, is that application hanging due to deadlock between inGregorian and AbstractCalendar.

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            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8275036 Potential cyclic dependencies between Gregorian and CalendarSystem

            • P3 - Major loss of function.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8275321 Potential cyclic dependencies between Gregorian and CalendarSystem

            • P3 - Major loss of function.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8276235 Potential cyclic dependencies between Gregorian and CalendarSystem

            • P3 - Major loss of function.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8276237 Potential cyclic dependencies between Gregorian and CalendarSystem

            • P3 - Major loss of function.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8278201 Potential cyclic dependencies between Gregorian and CalendarSystem

            • P3 - Major loss of function.
            • Resolved
            links to

            Commit Commit openjdk/jdk11u-dev/e2f83016

            Commit Commit openjdk/jdk13u-dev/922ce7ee

            Commit Commit openjdk/jdk15u-dev/8716863f

            Commit Commit openjdk/jdk17u/f3cc4aac

            Commit Commit openjdk/jdk/ddc26274

            Review Review openjdk/jdk11u-dev/500

            Review Review openjdk/jdk13u-dev/286

            Review Review openjdk/jdk15u-dev/127

            Review Review openjdk/jdk17u/170

            Review Review openjdk/jdk/5683

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                jpai Jaikiran Pai
                yyang Yi Yang
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                  Updated:
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