java.lang.NullPointerException in hibernate

warren@wgoldman.com · **Joined:** Wed Aug 11, 2010 5:27 pm **Posts:** 5

Hibernate seems to be keeping the details behind my problem a secret, not sure how to uncover some helpful debugging info.
Anyone know how to get more info than this out of hibernate (IMHO it should provide this by default) ?

java.lang.NullPointerException
org.hibernate.persister.entity.AbstractPropertyMapping.toColumns(AbstractPropertyMapping.java:65)
org.hibernate.persister.entity.BasicEntityPropertyMapping.toColumns(BasicEntityPropertyMapping.java:31)
org.hibernate.persister.entity.AbstractEntityPersister.toColumns(AbstractEntityPersister.java:1354)
org.hibernate.loader.criteria.CriteriaQueryTranslator.getColumns(CriteriaQueryTranslator.java:434)
org.hibernate.loader.criteria.CriteriaQueryTranslator.getColumnsUsingProjection(CriteriaQueryTranslator.java:394)
org.hibernate.criterion.SimpleExpression.toSqlString(SimpleExpression.java:45)
org.hibernate.loader.criteria.CriteriaQueryTranslator.getWhereCondition(CriteriaQueryTranslator.java:334)
org.hibernate.loader.criteria.CriteriaJoinWalker.(CriteriaJoinWalker.java:90)
org.hibernate.loader.criteria.CriteriaJoinWalker.(CriteriaJoinWalker.java:59)
org.hibernate.loader.criteria.CriteriaLoader.(CriteriaLoader.java:67)
org.hibernate.impl.SessionImpl.list(SessionImpl.java:1550)
org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:283)

shynate26 · **Posted:** Thu Aug 12, 2010 12:33 am

Hello warren@wgoldman.com,

This seems the object is null in the criteria . To be clearer trying to set the value in the query from an property of the foreign entity.

ex : class Parent{
private ForeignKey f;
}

class ForeignKey {
private int count;
}

("from Parent p where f.count=:value").setString("value",f.getCount());

The column might be null-able. So try checking not null when deriving the values.

Code:

try {

Criteria ...query

}catch(NullPointerException e)
{
e.printStackTrace();
}

warren@wgoldman.com · **Joined:** Wed Aug 11, 2010 5:27 pm **Posts:** 5

Thanks for the reply, I am really looking more for suggestions on how to get hibernate to display more useful information to be able to better understand the issue.

sanne.grinovero · **Posted:** Thu Aug 12, 2010 1:27 pm

warren, please post your questions in the right forum: https://forum.hibernate.org/viewforum.php?f=1