Details
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Bug
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Status: Resolved
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Low
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Resolution: Fixed
Description
Running under java11, GCInspector throws the following exception:
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)
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.
Attachments
Issue Links
- relates to
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CASSANDRA-9608 Support Java 11
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- Resolved
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- links to
