#1526 Illegal reflective access warning on JDK11

[Andrea Aime]

From the warning emitted by the JDK:

WARNING: Illegal reflective access by org.hsqldb.persist.RAFileNIO (file:/home/aaime/.m2/repository/org/hsqldb/hsqldb/2.4.1/hsqldb-2.4.1.jar) to method java.nio.DirectByteBuffer.cleaner()

[MichaeL]

Hello,

I can confirm this issue. I use the epsg database and get the following warning (using java 9 and hsqldb 2.4.1):

... INFORMATION: dataFileCache commit end WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by org.hsqldb.persist.RAFileNIO (file:/D:/lib/hsqldb.jar) to method java.nio.DirectByteBuffer.cleaner() WARNING: Please consider reporting this to the maintainers of org.hsqldb.persist.RAFileNIO 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 ...

regards
Micha

[Konstantin Kolinko]

I am also observing this warning, using HSQLDB 2.4.1 in a web application deployed on Apache Tomcat running with OpenJDK 11.0.2.

There is a workaround.
If I add the following option to Java command line, the warning disappears:

--add-opens=java.base/java.nio=ALL-UNNAMED

For sake of completeness, I should add that
startup scripts of Apache Tomcat also add the following options to the command line. I do not know whether they are important for HSQLDB. (Source code)

--add-opens=java.base/java.lang=ALL-UNNAMED
--add-opens=java.base/java.io=ALL-UNNAMED
--add-opens=java.rmi/sun.rmi.transport=ALL-UNNAMED

[Fred Toussi]

Fixed and committed for version 2.5.0

[Fred Toussi]

Fixed and committed for version 2.5.0

[MichaeL]

Thank you for your effort.