The line numbers from 2.0 branch should match:
https://svn.apache.org/repos/asf/cayenne/main/branches/STABLE-2.0/
Looking at the code, it seems to come down to DataContext having a
null EntityResolver. A random thought - is there a serialization/
deserialization cycle somewhere in your app, so that the DataContext
somehow loses its EntityResolver and can't properly reattach?
(I almost feel like we should throw an exception early from within
DataContext.awakeFromDeserialization() if the context failed to
acquire an EntityResolver).
Andrus
On Aug 31, 2007, at 6:15 PM, Alexander Lamb (dev) wrote:
Initially, it was a static method to fetch a Patient from the
primary key (give the DataContext, the String, returns the Patient
or null).
Since whatever I was doing would crash Cayenne, I simply tried to
do fetch all patients:
Here is the function (will all my experiments commented out :-)
Oviously, I simply want to fetch a Patient from his key (a varchar
of approx. 35 characters).
public static Patient patientWithPKInContext(String pk,
DataContext dataContext) {
//Expression q = ExpressionFactory.matchExp
(Patient.BIRTH_CITY_PROPERTY,"Bitola");
//Expression q = Expression.fromString("patientPk = '" + pk + "'");
// Patient p = (Patient)DataObjectUtils.objectForPK(dataContext,
"Patient", pk);
//System.out.println("--- found object: " + p);
//return p;
// System.out.println("EXP:" + q.toString());
// SelectQuery s = new SelectQuery(Patient.class,q);
// List patients = dataContext.performQuery(s);
SelectQuery allPatients = new SelectQuery(Patient.class);
List patients = dataContext.performQuery(allPatients);
if(patients.size() == 0)
return null;
else
return (Patient)patients.get(0);
}
Le 31 août 07 à 17:07, Michael Gentry a écrit :
Hi Alex,
I'm curious as to why:
at ch.rodano.msbase.model.Patient.patientWithPKInContext
(Patient.java:30)
is in your stack trace? What does that method do?
Thanks,
/dev/mrg
On 8/31/07, Alexander Lamb (dev) <[EMAIL PROTECTED]> wrote:
Hello list,
We are experimenting a Cayenne crash and wondering how to get
around it.
Here is the place of the crash:
java.lang.NullPointerException
at org.apache.cayenne.query.BaseQueryMetadata.resolve
(BaseQueryMetadata.java:97)
at org.apache.cayenne.query.SelectQuery.getMetaData
(SelectQuery.java:
151)
at org.apache.cayenne.util.ObjectContextQueryAction.<init>
(ObjectContextQueryAction.java:69)
at org.apache.cayenne.access.DataContextQueryAction.<init>
(DataContextQueryAction.java:46)
at org.apache.cayenne.access.DataContext.onQuery
(DataContext.java:1387)
at org.apache.cayenne.access.DataContext.performQuery
(DataContext.java:1376)
at ch.rodano.msbase.model.Patient.patientWithPKInContext
(Patient.java:30)
I am not certain how to check the line were it crashed (looking at
the code repository on-line does not probably garantee the line
number is the same).
We are simply trying to get a list of objects:
SelectQuery allPatients = new SelectQuery(Patient.class);
List patients = dataContext.performQuery(allPatients);
Probably something is wrong with our model, but what? How to find
out?
The only different thing we did (which we did already previously) is
that the primary key for Patient is a varchar (String) and is not
hidden in the Java Class.
Thanks for any hints (we regenerated everyting, etc... always the
same crash)
Alex
