Hi Jasmin, Do you have all your entities listed in persistence.xml?
-mike On Fri, May 15, 2009 at 7:08 AM, Jasmin Riemer <[email protected]> wrote: > Hello everybody, > > currently, I am working with OpenJPA in the Spring framework and try to > implement the following: > > I inherit certain subclasses from a mainclass. All these classes should be > mapped to a single table, so I use InheritanceType.SINGLE_TABLE and add a > discriminator value to each subclass. > > Simplified, it looks like this: > > @Entity > @Inheritance(strategy=InheritanceType.SINGLE_TABLE) > @DiscriminatorColumn(name="doc_type", > discriminatorType=DiscriminatorType.STRING) > public abstract class Document { > > // ... > > } > > @Entity > @DiscriminatorValue(value="Magazine") > public class Magazine extends Document { > > // ... > > } > > @Entity > @DiscriminatorValue(value="Book") > public class Book extends Document { > > // ... > > } > > Unfortunately, I get the following error message when I try to load data > from the database: > > Exception in thread "main" > org.springframework.dao.InvalidDataAccessApiUsageE xception: Could not map > discriminator value "Book" to any known subclasses of the requested class > "project.entities.Document" (known discriminator values: [Document, > Magazine]).; nested exception is <openjpa-1.2.1-r752877:753278 nonfatal user > error> org.apache.openjpa.persistence.ArgumentException: Could not map > discriminator value "Book" to any known subclasses of the requested class > "project.entities.Document" (known discriminator values: [Document, > Magazine]). > > It seems that there are only known the main class and the subclass > "Magazine", but there is a problem with "Book" (and some other classes > inherited from "Document"). > > I do not have much experience with OpenJPA and Spring and thus I have no > clue how to solve this problem. Anybody out there who has an idea or maybe > had a similar problem? > Is there maybe something special I could have used accidentally for > "Magazine", but not for the other classes? > -- > Neu: GMX FreeDSL Komplettanschluss mit DSL 6.000 Flatrate + > Telefonanschluss für nur 17,95 Euro/mtl.!* > http://dslspecial.gmx.de/freedsl-surfflat/?ac=OM.AD.PD003K11308T4569a >
