uschindler commented on pull request #572:
URL: https://github.com/apache/lucene/pull/572#issuecomment-1002557840


   > I confirmed this log via luke running on OpenJ9 11.
   > 
   > ```
   > 17:32:51 [WARNING] org.apache.lucene.store.MMapDirectory: Unmapping is not 
supported, because Lucene cannot read 'jdk.unsupported' module [please add 
'jdk.unsupported' to modular application either by command line or its module 
descriptor]
   > 17:32:51 [WARNING] org.apache.lucene.util.RamUsageEstimator: Lucene cannot 
correctly calculate object sizes on 64bit JVMs that are not based on Hotspot or 
a compatible implementation.
   > 17:32:52 [INFO] org.apache.lucene.luke.models.util.IndexUtils: 
IndexReaders (1 leaf readers) successfully opened. Index 
path=/home/moco/tmp/20ng
   > ```
   > 
   > (It seems OpenJ9 resolves `com.sun.management.HotSpotDiagnosticMXBean` but 
the implementation actually don't have `getVMOption` method. Unfortunately, I 
don't have much information about it. [#572 
(comment)](https://github.com/apache/lucene/pull/572#discussion_r776136859))
   
   OK, thanks. I will check the compatibility with J9 later. It may also be 
that it has a VMOption, but the name is different (I have that in mind). So we 
can also try 2 different options for same.
   
   This is unrelated to this issue, so we can fix it as a separate issue to 
bring more J9 compatibility. I did this last time around 2012 and the support 
for the bean was.... bad!


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