llegal reflective access by org.eclipse.paho.client.mqttv3.internal.FileLock

[sblantipodi]

Thanks for the great project.

• [ ] Bug exists Release Version 1.2.4 ( Master Branch)

When I connect to my mqtt broker using Java 11 I get this warning:

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.eclipse.paho.client.mqttv3.internal.FileLock (file:/C:/Users/sblantipodi/.m2/repository/org/eclipse/paho/org.eclipse.paho.client.mqttv3/1.2.4/org.eclipse.paho.client.mqttv3-1.2.4.jar) to method sun.nio.ch.FileLockImpl.release()
WARNING: Please consider reporting this to the maintainers of org.eclipse.paho.client.mqttv3.internal.FileLock
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

Thank you

[mspoehr]

Can confirm this happens on Java 11 on release version 1.2.5.

[jayjupdhig]

Yes, now it's gone. I've temporary switched to Zulu JVM 11 on my Windows system because the the HiveMQ CE MQTT broker. But then, it installed it on a Debian 9 VirtualBox VM and changed my Windows default VM (Command %PATH%, %JAVA_HOME%) back to version 8 from Oracle. Now the messages are gone on my Windows system (where i've wrote the Client that uses paho for connecting to the HivqME CE Debian 9 Server)

Maybe the paho developers know ho to suppress that message on JVM 11 usage and can fix it. (?)

[mspoehr]

@martijintro if you mean that the warnings are gone on Java 8, that is to be expected--that version of java does not print these warnings, even without supressing the messages.

[jayjupdhig]

thank you very much!!

[jayjupdhig]

If you need more informations, so please don't hesitate to ask for. Thanks.

With best regards, Jan

[HorstFiedler]

Same with openjdk version "13" 2019-09-17

[jayjupdhig]

@Paho Developers: So still unfixed? Then fix it please...

That's all i have to say.

[gaycookie]

Same for me on Java 11.0.9.1 (Corretto) and Java 11.0.9 (Adopt OpenJ9) using version 1.2.5 of this package.

[Panayiotou-P]

Same for me also using JDK 11.0.9.1 and paho client 1.2.5

[camstuart]

Same problem here (GraalVM)

java -version
openjdk version "11.0.10" 2021-01-19
OpenJDK Runtime Environment GraalVM CE 21.0.0.2 (build 11.0.10+8-jvmci-21.0-b06)
OpenJDK 64-Bit Server VM GraalVM CE 21.0.0.2 (build 11.0.10+8-jvmci-21.0-b06, mixed mode, sharing)

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by org.eclipse.paho.client.mqttv3.internal.FileLock (file:/home/cam/.gradle/caches/modules-2/files-2.1/org.eclipse.paho/org.eclipse.paho.client.mqttv3/1.2.5/1546cfc794449c39ad569853843a930104fdc297/org.eclipse.paho.client.mqttv3-1.2.5.jar) to method sun.nio.ch.FileLockImpl.release()
WARNING: Please consider reporting this to the maintainers of org.eclipse.paho.client.mqttv3.internal.FileLock
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

[rz259]

This seems to be a duplicate von issue #507. See my comment on this topic at #507 to circumvent this problem.

[jayjupdhig]

OK thx

[kamshory]

I use MemoryPersistence and this WARNING is gone

String uri = "tcp://"+ConfigSubscriberMQTT.getSubscriberMqttAddress()+":"+ConfigSubscriberMQTT.getSubscriberMqttPort();
String clientID = UUID.randomUUID().toString();
MemoryPersistence persistence = new MemoryPersistence();
this.subscriber = new MqttClient(uri, clientID, persistence);