[OPENJPA-2267] native query select with null result causes NullPointerException

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.2.0, 2.3.0
• Fix Version/s: 2.3.0
• Component/s: query
• 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
• Assignee: Richard G. Curtis
• Reporter: Ted Leung
• Created: 26/Sep/12 02:29
• Updated: 06/Jun/15 21:19
• Resolved: 27/Sep/12 21:06

Description

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)

Issue Links

• duplicates: OPENJPA-2195 Native Query with specified result class can throw NPE when return data contains a null-valued column