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  1. JDK
  2. JDK-8237508

Simplify JarFile.isInitializing

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        JDK-8234466 regress startup and footprint of very small applications noticeably.

        Cause appears to be the addition of a lambda to JarFile.<clinit>. Since the value is only read rarely and only in one place, it could be simplified to use the default ThreadLocal initial value (null):

        - static final ThreadLocal<Boolean> isInitializing =
        - ThreadLocal.withInitial(() -> Boolean.FALSE);
        + static final ThreadLocal<Boolean> isInitializing = new ThreadLocal<>();
         
        .. with adjustments in the places that read. This recuperates the startup regression.

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                Assignee:
                redestad Claes Redestad
                Reporter:
                redestad Claes Redestad
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