Ted Leung created OPENJPA-2267:
----------------------------------
Summary: 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
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
Priority: Minor
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> 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 MedicalData". 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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