Hi Dave, Are you getting the NPE immediately after calling:
codeVersion.setMajorNumber(1); or is it further along? On Sun, Jun 21, 2009 at 10:07 PM, Dave Lamy<[email protected]> wrote: > Quick question/problem on transient objects: > > I've got a persistent class AppVersion, which simply tracks a version of the > code/database values for migration purposes. I want to have a persistent > AppVersion in the database, but then create a transient AppVersion > representing the code version for comparison purposes. > > So I did what came naturally for the transient object (using > Cayenne-generated _AppVersion/AppVersion classes): > > AppVersion codeVersion = new AppVersion(); > codeVersion.setMajorNumber(1); > > But I get an exception (3.0 M5): > > java.lang.NullPointerException > at > org.apache.cayenne.util.ObjectContextGraphAction.handlePropertyChange(ObjectContextGraphAction.java:59) > at > org.apache.cayenne.access.DataContext.propertyChanged(DataContext.java:1591) > at > org.apache.cayenne.CayenneDataObject.writeProperty(CayenneDataObject.java:226) > ... > > The ObjectContextGraphAction is pulling the ObjectId, which is null in the > transient object. > > What am I doing wrong here? How can I create a transient object and write > property values without getting this NPE? > > Thanks for the help-- > Dave >
