Hi all,
This is my problem:
I have a 1:N relation between objects Customer and Ticket.
I want to find all Tickets without Customer.
I try:
SELECT t FROM Ticket t WHERE t.customer=$1 order by t.id
with $1 = null
But I have the following error:
null
java.lang.NullPointerException
at org.exolab.castor.jdo.engine.DatabaseImpl.getLockEngine(DatabaseImpl.java:196)
at org.exolab.castor.jdo.engine.OQLQueryImpl.create(OQLQueryImpl.java:270)
at org.exolab.castor.jdo.engine.DatabaseImpl.getOQLQuery(DatabaseImpl.java:439)
....
My solution may be wrong. So what is the better way to find these tickets?
Thanks.
J.
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