[jira] [Created] (CASSANDRA-14757) GCInspector "Error accessing field of java.nio.Bits" under java11

["Jason Brown (JIRA)" <ji...@apache.org>]

Jason Brown created CASSANDRA-14757:
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             Summary: 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: Metrics
            Reporter: Jason Brown
             Fix For: 4.0


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.



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