Null pointer in Cayenne 2.0.3 code

From: Alexander Lamb (dev) ("Alexander)
Date: Fri Aug 31 2007 - 10:20:18 EDT

  • Next message: Michael Gentry: "Re: Null pointer in Cayenne 2.0.3 code"

    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

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