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From: "Jeff Jirsa (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (CASSANDRA-9077) NPE
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    [ https://issues.apache.org/jira/browse/CASSANDRA-9077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14387992#comment-14387992 ] 

Jeff Jirsa commented on CASSANDRA-9077:
---------------------------------------

Reproduced in trunk, I'll see if I can track it down.


> NPE
> ---
>
>                 Key: CASSANDRA-9077
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9077
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: dan jatnieks
>            Priority: Minor
>         Attachments: 9077-stacktrace.log
>
>
> I am seeing an NPE on the latest 2.1 branch with this sequence of deletes from a list - first delete the entire list, then attempt to delete one element.
> I expected to see {{List index 0 out of bound, list has size 0}} but instead got an NPE.
> {noformat}
> ./bin/cqlsh
> Connected to Test Cluster at 127.0.0.1:9042.
> [cqlsh 5.0.1 | Cassandra 2.1.3-SNAPSHOT | CQL spec 3.2.0 | Native protocol v3]
> Use HELP for help.
> cqlsh> use frozen_collections ;
> cqlsh:frozen_collections> DROP TABLE IF EXISTS t;
> cqlsh:frozen_collections> CREATE TABLE t (id text PRIMARY KEY, l list<text>, s set<text>);
> cqlsh:frozen_collections> INSERT INTO t (id, l, s) VALUES ('user', ['1'], {'1'});
> cqlsh:frozen_collections>
> cqlsh:frozen_collections> DELETE l FROM t WHERE id ='user';
> cqlsh:frozen_collections> //INSERT INTO t (id, l) VALUES ('user', ['1']);
> cqlsh:frozen_collections> DELETE l[0] FROM t WHERE id = 'user';
> ServerError: <ErrorMessage code=0000 [Server error] message="java.lang.NullPointerException">
> cqlsh:frozen_collections>
> cqlsh:frozen_collections> DELETE s FROM t WHERE id ='user';
> cqlsh:frozen_collections> DELETE s['1'] FROM t WHERE id = 'user';
> {noformat}
> It appears the {{DELETE emails...}} directly followed by {{DELETE emails[0]...}} is the offending sequence. Either one alone works fine, as does adding an intervening insert/update.
> The same sequence performed on a Set rather than List works (as shown above).



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