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https://issues.apache.org/jira/browse/CASSANDRA-14087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16394557#comment-16394557
 ] 

Blake Eggleston commented on CASSANDRA-14087:
---------------------------------------------

oops, sorry about that. ninja removed it

> NPE when CAS encounters empty frozen collection
> -----------------------------------------------
>
>                 Key: CASSANDRA-14087
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14087
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Jens Bannmann
>            Assignee: Kurt Greaves
>            Priority: Major
>             Fix For: 3.0.x, 3.11.x
>
>
> When a compare-and-set operation specifying an equality criterion with a 
> non-{{null}} value encounters an empty collection ({{null}} cell), the server 
> throws a {{NullPointerException}} and the query fails.
> This does not happen for non-frozen collections.
> There's a self-contained test case at 
> [github|https://github.com/incub8/cassandra-npe-in-cas].
> The stack trace for 3.11.0 is:
> {code}
> ERROR [Native-Transport-Requests-1] 2017-11-27 12:59:26,924 
> QueryMessage.java:129 - Unexpected error during query
> java.lang.NullPointerException: null
>         at 
> org.apache.cassandra.cql3.ColumnCondition$CollectionBound.appliesTo(ColumnCondition.java:546)
>  ~[apache-cassandra-3.11.0.jar:3.11.0]
>         at 
> org.apache.cassandra.cql3.statements.CQL3CasRequest$ColumnsConditions.appliesTo(CQL3CasRequest.java:324)
>  ~[apache-cassandra-3.11.0.jar:3.11.0]
>         at 
> org.apache.cassandra.cql3.statements.CQL3CasRequest.appliesTo(CQL3CasRequest.java:210)
>  ~[apache-cassandra-3.11.0.jar:3.11.0]
>         at 
> org.apache.cassandra.service.StorageProxy.cas(StorageProxy.java:265) 
> ~[apache-cassandra-3.11.0.jar:3.11.0]
>         at 
> org.apache.cassandra.cql3.statements.ModificationStatement.executeWithCondition(ModificationStatement.java:441)
>  ~[apache-cassandra-3.11.0.jar:3.11.0]
>         at 
> org.apache.cassandra.cql3.statements.ModificationStatement.execute(ModificationStatement.java:416)
>  ~[apache-cassandra-3.11.0.jar:3.11.0]
>         at 
> org.apache.cassandra.cql3.QueryProcessor.processStatement(QueryProcessor.java:217)
>  ~[apache-cassandra-3.11.0.jar:3.11.0]
>         at 
> org.apache.cassandra.cql3.QueryProcessor.process(QueryProcessor.java:248) 
> ~[apache-cassandra-3.11.0.jar:3.11.0]
>         at 
> org.apache.cassandra.cql3.QueryProcessor.process(QueryProcessor.java:233) 
> ~[apache-cassandra-3.11.0.jar:3.11.0]
>         at 
> org.apache.cassandra.transport.messages.QueryMessage.execute(QueryMessage.java:116)
>  ~[apache-cassandra-3.11.0.jar:3.11.0]
>         at 
> org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:517)
>  [apache-cassandra-3.11.0.jar:3.11.0]
>         at 
> org.apache.cassandra.transport.Message$Dispatcher.channelRead0(Message.java:410)
>  [apache-cassandra-3.11.0.jar:3.11.0]
>         at 
> io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105)
>  [netty-all-4.0.44.Final.jar:4.0.44.Final]
>         at 
> io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:357)
>  [netty-all-4.0.44.Final.jar:4.0.44.Final]
>         at 
> io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:35)
>  [netty-all-4.0.44.Final.jar:4.0.44.Final]
>         at 
> io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:348)
>  [netty-all-4.0.44.Final.jar:4.0.44.Final]
>         at 
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) 
> [na:1.8.0_151]
>         at 
> org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:162)
>  [apache-cassandra-3.11.0.jar:3.11.0]
>         at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:109) 
> [apache-cassandra-3.11.0.jar:3.11.0]
>         at java.lang.Thread.run(Thread.java:748) [na:1.8.0_151]
> {code}



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