I ran into a problem where a NullPointerException was being thrown from deep
inside Hibernate (latest version), with no real clue as to what the problem
was:
java.lang.NullPointerException
at java.lang.reflect.Method.invoke(Native Method)
at
cirrus.hibernate.impl.ClassPersister.setPropertyValues(ClassPersister.java:4
49)
at cirrus.hibernate.impl.ClassPersister.hydrate(ClassPersister.java:680)
at
cirrus.hibernate.impl.RelationalDatabaseSession.loadFromResultSet(Relational
DatabaseSession.java:1133)
...
It took me a while to figure out where to look. It turned out that there
was a null value in my database, in a column with a setter method that
expects a Java double - so really, the problem was either with my data or
with the setter method, depending on how you look at it. To make the error
message more helpful in future, I've added an exception case to
ClassPersister.setPropertyValues:
catch (NullPointerException npe) {
throw new HibernateException(
"NullPointerException occurred inside setter for class "
+ className
+ ", property "
+ propertyNames[j]
);
}
I've checked the change into CVS - if there's a better way to handle this,
please let me know.
Anton
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