JDBC driver uses Unsafe API, which will be completely deprecated in a future release of Java

benesq
New Contributor

‎06-23-2025 12:09 PM

Using JDBC driver (2.7.3) in OpenJDK 24 gives the following warning:

WARNING: A terminally deprecated method in sun.misc.Unsafe has been called
WARNING: sun.misc.Unsafe::arrayBaseOffset has been called by com.databricks.client.jdbc42.internal.apache.arrow.memory.util.MemoryUtil
WARNING: Please consider reporting this to the maintainers of class com.databricks.client.jdbc42.internal.apache.arrow.memory.util.MemoryUtil
WARNING: sun.misc.Unsafe::arrayBaseOffset will be removed in a future release

While it's uncertain what Java release it will be deprecated in, I think this needs to be fixed sooner rather than later. Java's new FFM API provides a nice way of handling Off-Heap memory and probably would fix whatever this MemoryUtil class is trying to do in a safe way. There are also other alternatives.

Thanks,

Ben

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NandiniN
Databricks Employee
Databricks Employee

‎10-03-2025 09:37 PM

Hey @benesq , 

For JDBC driver 2.7.4 https://www.databricks.com/spark/jdbc-drivers-download should be used with

Java Runtime Environment (JRE) 8.0, 11.0 or 21.0. As mentioned in the installation doc "Each machine where you use the Databricks JDBC Driver must have Java Runtime Environment (JRE) 8.0, 11.0 or 21.0."

This will be fixed in a subsequent version of JavaFX side, https://bugs.openjdk.org/browse/JDK-8345121 does mention the issue is now resolved.

 Thanks!

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