The collection-descriptor for an abstract class does not have a table
attribute. So, when SqlQueryStatement.splitCriteria is called, a
NullPointerException is thrown when it tries to put the root TableAlias into
the m_jointTreeToCriteria HashMap, because
SqlQueryStatement.TableAlias.hashCode looks like this:
public int hashCode() {
return table.hashCode();
}
...and table is null.
The code that I used to produce this error looks like this:
PersistenceBroker pb = PersistenceBrokerFactory
.defaultPersistenceBroker();
Criteria subCrit = new Criteria();
subCrit.addEqualTo("id", new Long(1));
ReportQueryByCriteria assocPBQ = QueryFactory.newReportQuery(
BaseInterface.class, subCrit);
assocPBQ.setAttributes(new String[] { "id" });
Criteria crit = new Criteria();
crit.addIn("base.id", assocPBQ);
QueryByCriteria q = (QueryByCriteria) QueryFactory.newQuery(
BaseAssocInterface.class, crit, true);
Collection c = pb.getCollectionByQuery(q);
The stack trace looks like this:
Caused by: java.lang.NullPointerException
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement$TableAlias.hashCode(
Unknown Source)
at java.util.HashMap.hash(HashMap.java:261)
at java.util.HashMap.put(HashMap.java:379)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.splitCriteria(Unknow
n Source)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.<init>(Unknown
Source)
at
org.apache.ojb.broker.accesslayer.sql.SqlSelectStatement.<init>(Unknown
Source)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.getSubQuerySQL(Unkno
wn Source)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.appendSubQuery(Unkno
wn Source)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.appendParameter(Unkn
own Source)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.appendInCriteria(Unk
nown Source)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.appendCriteria(Unkno
wn Source)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.appendSQLClause(Unkn
own Source)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.asSQLStatement(Unkno
wn Source)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.appendClause(Unknown
Source)
at
org.apache.ojb.broker.accesslayer.sql.SqlQueryStatement.appendWhereClause(Un
known Source)
at
org.apache.ojb.broker.accesslayer.sql.SqlSelectStatement.getStatement(Unknow
n Source)
at
org.apache.ojb.broker.accesslayer.sql.SqlGeneratorDefaultImpl.getPreparedSel
ectStatement(Unknown Source)
at
org.apache.ojb.broker.accesslayer.JdbcAccessImpl.executeQuery(Unknown
Source)
at
org.apache.ojb.broker.accesslayer.RsQueryObject.performQuery(Unknown Source)
at org.apache.ojb.broker.accesslayer.RsIterator.<init>(Unknown
Source)
at
org.apache.ojb.broker.core.RsIteratorFactoryImpl.createRsIterator(Unknown
Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getRsIteratorFromQuery(Unkn
own Source)
at
org.apache.ojb.broker.core.PersistenceBrokerImpl.getIteratorFromQuery(Unknow
n Source)
at
org.apache.ojb.broker.core.QueryReferenceBroker.getCollectionByQuery(Unknown
Source)
... 20 more
Joshua Phillips
Contractor (SAIC)
Tel: 301 451 6346
Fax: 301 480 4222
[EMAIL PROTECTED]
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