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https://issues.apache.org/jira/browse/LUCENE-10287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17454574#comment-17454574
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Dawid Weiss commented on LUCENE-10287:
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I've added an integration layer test to the jms PR branch to verify mmap can be
loaded and confirmed it fails without this patch:
{code}
org.apache.lucene.distribution.TestModularLayer > test suite's output saved to
C:\Work\apache\lucene\lucene\distribution-tests\build\test-results\test\outputs\OUTPUT-org.apache.lucene.distribution.TestModularLayer.txt,
copied below:
> java.lang.AssertionError:
> Expecting map:
> {"hello"="world", "unmap.supported"="false"}
> to contain only:
> ["unmap.supported"="true", "hello"="world"]
> map entries not found:
> ["unmap.supported"="true"]
> and map entries not expected:
> ["unmap.supported"="false"]
> at org.apache.lucene.distribution.TestModularLayer....
{code}
> Add jdk.unsupported module to Luke startup script
> -------------------------------------------------
>
> Key: LUCENE-10287
> URL: https://issues.apache.org/jira/browse/LUCENE-10287
> Project: Lucene - Core
> Issue Type: Bug
> Components: luke
> Affects Versions: 9.0
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Priority: Major
> Fix For: 9.1, 10.0 (main), 9.x
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> See my note on the JDK 9.0 release: When you start Luke (in module mode, as
> done by default), it won't use MMapDirectory when opening indexes. The reason
> is simple: It can't see sun.misc.Unsafe, which is needed to unmap mapped byte
> buffers. It will silently disable itsself (as it is not a hard dependency).
> By default we should pass the "jdk.unsupported" module when starting Luke.
> In case of a respin, this should be backported.
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