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https://issues.apache.org/jira/browse/CASSANDRA-14757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16868210#comment-16868210
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mck commented on CASSANDRA-14757:
---------------------------------
done. am i free to merge [~snazy]?
> GCInspector "Error accessing field of java.nio.Bits" under java11
> -----------------------------------------------------------------
>
> Key: CASSANDRA-14757
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14757
> Project: Cassandra
> Issue Type: Bug
> Components: Observability/Metrics
> Reporter: Jason Brown
> Assignee: Robert Stupp
> Priority: Low
> Labels: Java11, pull-request-available
> Fix For: 4.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Running under java11, {{GCInspector}} throws the following exception:
> {noformat}
> DEBUG [main] 2018-09-18 05:18:25,905 GCInspector.java:78 - Error accessing
> field of java.nio.Bits
> java.lang.NoSuchFieldException: totalCapacity
> at java.base/java.lang.Class.getDeclaredField(Class.java:2412)
> at
> org.apache.cassandra.service.GCInspector.<clinit>(GCInspector.java:72)
> at
> org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:308)
> at
> org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:590)
> at
> org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:679)
> {noformat}
> This is because {{GCInspector}} uses reflection to read the {{totalCapacity}}
> from {{java.nio.Bits}}. This field was renamed to {{TOTAL_CAPACITY}}
> somewhere between java8 and java11.
> Note: this is a rather harmless error, as we only look at
> {{Bits.totalCapacity}} for metrics collection on how much direct memory is
> being used by {{ByteBuffer}}s. If we fail to read the field, we simply return
> -1 for the metric value.
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