[SOLVED] Re: empty optional to-many relations

Timo Hoepfner wrote on 8/14/06 3:07 PM:
> Am 14.08.2006 um 20:24 schrieb Zak Burke:
> 
>> <com.webobjects.appserver._private.WOComponentRequestHandler>: Exception
>> occurred while handling request:
>> java.lang.NullPointerException
>> DEBUG [2006-08-14 13:58:39,270] (LogPrintStream.java:96) -
>> java.lang.NullPointerException
>> at
>> com.webobjects.jdbcadaptor.JDBCAdaptor.isValidQualifierType(JDBCAdaptor.java:659)
>>
>> at
>> com.webobjects.eoaccess.EODatabaseContext.isValidQualifierTypeForAttribute(EODatabaseContext.java:5174)
> 
> I had exactly that a few weeks ago. I was banging my head onto the desk
> for several hours (not that it helped...) Finally it turned out, that
> somehow either the "valueClassName" (e.g. "NSNumber") or the "valueType"
> (e.g. "i") was empty for some arbitrary numeric attribute of an Entity.
> Double-check every attribute of the Entities you suspect to be related.

Wow. That was it -- I had added a new attribute to an entity and hadn't
specified its External Type. I'm impressed that you figured out the root
of the problem!

This wins my vote for "Exception that is least related to its cause."
I was lost down a different rabbit hole entirely, as this certainly
wasn't what it seemed.

Thanks for the help,

zak.