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https://issues.apache.org/jira/browse/SPARK-36704?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean R. Owen resolved SPARK-36704.
----------------------------------
    Fix Version/s: 3.1.3
                   3.2.0
                   3.0.4
       Resolution: Fixed

Issue resolved by pull request 33947
[https://github.com/apache/spark/pull/33947]

> InaccessibleObjectException in Java 9+ on startup
> -------------------------------------------------
>
>                 Key: SPARK-36704
>                 URL: https://issues.apache.org/jira/browse/SPARK-36704
>             Project: Spark
>          Issue Type: Bug
>          Components: Spark Core
>    Affects Versions: 3.2.0
>            Reporter: Sean R. Owen
>            Assignee: Sean R. Owen
>            Priority: Major
>             Fix For: 3.0.4, 3.2.0, 3.1.3
>
>
> A user reported this error on startup, which must be Java9+-related given the 
> Java-9+ exception:
> {code}
> Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make 
> private java.nio.DirectByteBuffer(long,int) accessible: module java.base does 
> not "opens java.nio" to unnamed module @71e9ddb4
>         at 
> java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:357)
>         at 
> java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:297)
>         at 
> java.base/java.lang.reflect.Constructor.checkCanSetAccessible(Constructor.java:188)
>         at 
> java.base/java.lang.reflect.Constructor.setAccessible(Constructor.java:181)
>         at org.apache.spark.unsafe.Platform.<clinit>(Platform.java:56)
> {code}
> Code in this section tries to open up some access to DirectBuffer by 
> reflection, which no longer works by default in Java 9+. We long ago tried to 
> handle this by dealing with the exception and avoiding reflection where not 
> possible. However this seems like a possible new way the same type of issue 
> can manifest.
> We can shore up the code checking this to try to handle this apparent error 
> path similarly.



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