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From Dmitriy Pavlov <dpav...@apache.org>
Subject JVM warnings during Java 11 startup
Date Wed, 27 Feb 2019 15:29:54 GMT
Hi Ignite Developers,

During the start of Ignite node under Java 11 (actually 9+) or during local
development you may face with warning related to illegal access.

You know that Ignite uses Unsafe operation for durable memory.

Accessing to Unsafe requires --illegal-access=permit (Now it is the default
for JVM. From the doc:
permit: ... The first reflective-access operation to any such package
causes a warning to be issued. However, no warnings are issued after the
first occurrence. This single warning describes how to enable further
warnings.

Warning example:

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by
org.apache.ignite.internal.util.GridUnsafe$2
(file:..libs/ignite-core-2.7.0.jar) to field java.nio.Buffer.address
WARNING: Please consider reporting this to the maintainers of
org.apache.ignite.internal.util.GridUnsafe$2
WARNING: Use --illegal-access=warn to enable warnings of further
illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release


Unfortunately removing or disabling this warning is absolutely impossible,
it is generated by JVM and there is no option to disable it:
https://docs.oracle.com/en/java/javase/11/tools/java.html#GUID-3B1CE181-CD30-4178-9602-230B800D4FAE


Sincerely,
Dmitriy Pavlov

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