Object-based monitors vs Lock based-monitors for JDK 17+

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Hi,

What are the recommendations on the use of Object-based monitors (i.e.
synchronized, Object.wait, Object.notify) vs. the use of Lock-based
monitors (i.e. Lock and Monitor interfaces), for JDK 17 and upcoming
versions?
There are scenarios where the Lock-based monitors are clearly preferable,
such as needing more than one condition or having non-structured
lock-unlock pairs.
However, for simple scenarios where both are applicable, which should we
use? Are there any performance or other advantages in using Object-based
vs. Lock-based monitors?

Also, which are preferable when using Loom's virtual threads? I recall
reading that there may be limitations around Object-based monitors and
virtual threads, such as blocking the carrier thread.

Thanks.
Regards,
Pedro

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<div dir=3D"ltr">Hi,<div><br></div><div>What are the recommendations=C2=A0o=
n the use of Object-based monitors (i.e. synchronized, Object.wait, Object.=
notify) vs. the use of Lock-based monitors (i.e. Lock and Monitor interface=
s), for JDK 17 and upcoming versions?</div><div>There are scenarios where t=
he Lock-based monitors are clearly preferable, such as needing more than on=
e condition or having non-structured lock-unlock pairs.</div><div>However, =
for simple scenarios where both are applicable, which should we use? Are th=
ere any performance=C2=A0or other advantages in using Object-based vs. Lock=
-based monitors?</div><div>=C2=A0</div><div>Also, which are preferable when=
 using Loom&#39;s virtual threads? I recall reading that there may be limit=
ations around Object-based monitors and virtual threads, such as blocking t=
he carrier thread.</div><div><br></div><div>Thanks.</div><div>Regards,</div=
><div>Pedro</div></div>

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