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https://issues.apache.org/jira/browse/SPARK-24421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16682951#comment-16682951
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Alan edited comment on SPARK-24421 at 11/11/18 6:13 PM:
--------------------------------------------------------
Sean: In the proposed release note text you say that access to the internal JDK
classes "is no longer possible in Java 9 and later, because of the new module
encapsulation system". I don't think this is quite right as the main issue you
ran into is that the JDK's internal cleaner mechanism was refactored and moved
from sun.misc to jdk.internal.ref. Also the comment about using add-opens may
need update too as java.lang remains open to code on the class path in JDK
9/10/11. I suspect the the comments in this issue about add-opens meant to say
jdk.internal.ref instead (although you just don't want to go there as directly
using anything in that package may break at any time).
was (Author: bateman):
Sean - In the proposed release note text you say that access to the internal
JDK classes "is no longer possible in Java 9 and later, because of the new
module encapsulation system". I don't think this is quite right as the main
issue you ran into is that the JDK's internal cleaner mechanism was refactored
and moved from sun.misc to jdk.internal.ref. Also the comment about using
`--add-opens` may need update too as java.lang remains open to code on the
class path in JDK 9/10/11. I suspect the the comments in this issue about
`--add-opens` meant to say jdk.internal.ref instead (although you just don't
want to go there as directly using anything in that package may break at any
time).
> Accessing sun.misc.Cleaner in JDK11
> -----------------------------------
>
> Key: SPARK-24421
> URL: https://issues.apache.org/jira/browse/SPARK-24421
> Project: Spark
> Issue Type: Sub-task
> Components: Build
> Affects Versions: 3.0.0
> Reporter: DB Tsai
> Priority: Major
> Labels: release-notes
>
> Many internal APIs such as unsafe are encapsulated in JDK9+, see
> http://openjdk.java.net/jeps/260 for detail.
> To use Unsafe, we need to add *jdk.unsupported* to our code’s module
> declaration:
> {code:java}
> module java9unsafe {
> requires jdk.unsupported;
> }
> {code}
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