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From Alex Araujo <cassandra-us...@alex.otherinbox.com>
Subject Re: How to invoke getNaturalEndpoints with jconsole?
Date Fri, 13 May 2011 15:31:14 GMT
On 5/13/11 10:08 AM, Maki Watanabe wrote:
> I wrote a small JMX client to invoke getNaturalEndpoints.
> It works fine at my test environment, but throws NPE for keyspace we
> will use for our application (both 0.7.5).
> Does anyone know quick resolution of that before I setting up
> cassandra on eclipse to inspect what happens :)
>
> thanks
>
> Exception in thread "main" javax.management.RuntimeMBeanException:
> java.lang.NullPointerException
> 	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.rethrow(DefaultMBeanServerInterceptor.java:877)
> [snip]
> 	at javax.management.remote.rmi.RMIConnector$RemoteMBeanServerConnection.invoke(RMIConnector.java:993)
> 	at my.test.getNaturalEndpoints.main(getNaturalEndpoints.java:32)
> Caused by: java.lang.NullPointerException
> 	at org.apache.cassandra.db.Table.createReplicationStrategy(Table.java:266)
> 	at org.apache.cassandra.db.Table.<init>(Table.java:212)
> 	at org.apache.cassandra.db.Table.open(Table.java:106)
> 	at org.apache.cassandra.service.StorageService.getNaturalEndpoints(StorageService.java:1497)
> [snip]
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
> 	at java.lang.Thread.run(Thread.java:636)
>
Did you by chance see this after dropping the keyspace?  I believe I've 
seen this as well.  If so (and if I'm interpreting the stack trace and 
code correctly) it might be related to queuing an op for a keyspace 
that's been dropped without checking if its metadata is null rather than 
your code.

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