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From "Rick Curtis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OPENJPA-2267) native query select with null result causes NullPointerException
Date Thu, 27 Sep 2012 21:07:07 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-2267?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13465089#comment-13465089
] 

Rick Curtis commented on OPENJPA-2267:
--------------------------------------

Committed revision 1391218 to trunk.
                
> native query select with null result causes NullPointerException
> ----------------------------------------------------------------
>
>                 Key: OPENJPA-2267
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-2267
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: query
>    Affects Versions: 2.2.0, 2.3.0
>         Environment: my system is fedora 16, MySql 5.5.18 (running innodb), jdk1.6.0_26,
openjdk 2.2.0 (also happened in 2.1.0), mysql-connector-java 5.1.18, commons-dbcp 1.4, spring
3.1.1
>            Reporter: Ted Leung
>            Assignee: Rick Curtis
>            Priority: Minor
>             Fix For: 2.3.0
>
>
> if you do a native query with a null resultset where the resulting object is not the
model object, it causes a null pointer exception.
> ---------------------------------------------------
> mysql> desc Data;
> +--------------------------+--------------+------+-----+---------+----------------+
> | Field                    | Type         | Null | Key | Default | Extra          |
> +--------------------------+--------------+------+-----+---------+----------------+
> | id                       | bigint(20)   | NO   | PRI | NULL    | auto_increment |
> | data                     | mediumblob   | YES  |     | NULL    |                |
> +--------------------------+--------------+------+-----+---------+----------------+
> 12 rows in set (0.01 sec)
> mysql> select count(*) from Data;
> +----------+
> | count(*) |
> +----------+
> |        0 |
> +----------+
> 1 row in set (0.00 sec)
> mysql> select max(id) from Data;
> +---------+
> | max(id) |
> +---------+
> |    NULL |
> +---------+
> 1 row in set (0.00 sec)
> now in java do :
> Query query = entityManager.createNativeQuery("select max(id) from Data", Long.class);
> List results = query.getResultList();
> The following exception ensues.
> ---------------------------------------------------
> <openjpa-2.2.0-r422266:1244990 nonfatal user error> org.apache.openjpa.persistence.ArgumentException:
Failed to execute query "select max(id) from Data". Check the query syntax for correctness.
See nested exception for details.
> 	at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:872)
> 	at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:794)
> 	at org.apache.openjpa.kernel.DelegatingQuery.execute(DelegatingQuery.java:542)
> 	at org.apache.openjpa.persistence.QueryImpl.execute(QueryImpl.java:286)
> 	at org.apache.openjpa.persistence.QueryImpl.getResultList(QueryImpl.java:302)
> ...
> Caused by: java.lang.NullPointerException
> 	at org.apache.openjpa.kernel.ResultPacker.pack(ResultPacker.java:202)
> 	at org.apache.openjpa.jdbc.kernel.SQLProjectionResultObjectProvider.getResultObject(SQLProjectionResultObjectProvider.java:88)
> 	at org.apache.openjpa.lib.rop.RangeResultObjectProvider.getResultObject(RangeResultObjectProvider.java:80)
> 	at org.apache.openjpa.lib.rop.EagerResultList.<init>(EagerResultList.java:36)
> 	at org.apache.openjpa.kernel.QueryImpl.toResult(QueryImpl.java:1251)
> 	at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:1007)
> 	at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:863)

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