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Rule 09. Locking (LCK)

Created by Dhruv Mohindra, last modified by David Svoboda on Aug 06, 2025

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Rules

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LCK00-J. Use private final lock objects to synchronize classes that may interact with untrusted code
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LCK01-J. Do not synchronize on objects that may be reused
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LCK02-J. Do not synchronize on the class object returned by getClass()
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LCK03-J. Do not synchronize on the intrinsic locks of high-level concurrency objects
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LCK04-J. Do not synchronize on a collection view if the backing collection is accessible
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LCK05-J. Synchronize access to static fields that can be modified by untrusted code
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LCK06-J. Do not use an instance lock to protect shared static data
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LCK07-J. Avoid deadlock by requesting and releasing locks in the same order
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LCK08-J. Ensure actively held locks are released on exceptional conditions
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LCK09-J. Do not perform operations that can block while holding a lock
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LCK10-J. Use a correct form of the double-checked locking idiom
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LCK11-J. Avoid client-side locking when using classes that do not commit to their locking strategy

Risk Assessment Summary

Rule	Severity	Likelihood	Detectable	Repairable	Priority	Level
LCK00-J	Low	Probable	No	No	P2	L3
LCK01-J	Medium	Probable	Yes	No	P8	L2
LCK02-J	Medium	Probable	Yes	No	P8	L2
LCK03-J	Medium	Probable	Yes	No	P8	L2
LCK04-J	Low	Probable	Yes	No	P4	L3
LCK05-J	Low	Probable	No	No	P2	L3
LCK06-J	Medium	Probable	Yes	No	P8	L2
LCK07-J	Low	Likely	No	No	P3	L3
LCK08-J	Low	Likely	Yes	Yes	P9	L2
LCK09-J	Low	Probable	No	No	P2	L3
LCK10-J	Low	Probable	Yes	No	P4	L3
LCK11-J	Low	Probable	No	No	P2	L3

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