Hi Luc, On Feb 26, 2006, at 10:21 AM, Luc Claes wrote:
Hi Craig,Here follows a sample of what could be a problematic situation. But maybe I'm missing something obvious. We are trying to mix a JDO 1.0 implementation (FastObjects) with a JDO 2.0 implementation (JPOX 1.1). The problem occurs at runtime on one of the 'makePersistent' call, depending on the included jdo jar (1.x or 2.0).
Yes, we did not make JDO 1 and JDO 2 able to be used by the same application without using different class loaders for the jars. That is, you would have to load the persistence-aware code (the code that references any JDO API) into two different class loaders.
You might also run into issues using classes enhanced for JDO 1 with JDO 2.
Craig
Luc import java.util.Properties; import javax.jdo.JDOHelper; import javax.jdo.PersistenceManager; import javax.jdo.PersistenceManagerFactory; public class Test { private void init() { // Create the JPOX 1.1 PMF Properties propertiesJPOX = new Properties();propertiesJPOX.setProperty ("javax.jdo.PersistenceManagerFactoryClass","org.jpox.PersistenceManag erFactoryImpl");// Other properties...PersistenceManagerFactory pmfJPOX = JDOHelper.getPersistenceManagerFactory(propertiesJPOX);// Create the FastObjects PMF Properties propertiesFastObjects = new Properties();propertiesFastObjects.setProperty ("javax.jdo.PersistenceManagerFactoryClass","com.poet.jdo.PersistenceM anagerFactories");// Other properties...PersistenceManagerFactory pmfFastObjects = JDOHelper.getPersistenceManagerFactory(propertiesFastObjects);PersistenceManager pmJPOX = pmfJPOX.getPersistenceManager();PersistenceManager pmFastObjects = pmfFastObjects.getPersistenceManager();Object objectToMakePersistent = null; // Here, various operations are taking place... // This will fail at runtime if we import the 1.x jdo.jar // because makePersistent is declared as returning void pmJPOX.makePersistent(objectToMakePersistent); // This will fail at runtime if we import the 2.0 jdo.jar // because makePersistent is declared as returning Object pmFastObjects.makePersistent(objectToMakePersistent); } } Craig L Russell wrote:Hi Luc Claes,JDO was designed to allow clean separation of application classes, so that you could mix and match implementations. But maybe a more specific example of what you are trying to accomplish would help decide the issue.Regards, Craig
Craig Russell Architect, Sun Java Enterprise System http://java.sun.com/products/jdo 408 276-5638 mailto:[EMAIL PROTECTED] P.S. A good JDO? O, Gasp!
smime.p7s
Description: S/MIME cryptographic signature
