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Reports static variables being lazily initialized
in an non-thread-safe manner. Lazy initialization of static variables should be done
in an appropriate synchronization construct, to prevent different threads from
performing conflicting initialization.
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If applicable, quick-fix is suggested
which introduces static holder pattern described in
<a href="http://en.wikipedia.org/wiki/Initialization_on_demand_holder_idiom">
http://en.wikipedia.org/wiki/Initialization_on_demand_holder_idiom
</a>
where the JVM guarantees thread-safety of such initializations.
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