The openjpa.MetaDataRepository configuration property controls the configuration of the MetaDataRepository. The following are valid properties:
			Preload: A boolean property. If true, OpenJPA will eagerly load the repository on 
			EntityManagerFactory creation. As a result, all Entity classes will be eagerly loaded by the JVM. 
                        Once MetaData preloading completes, all locking is removed from the MetaDataRepository and this will 
                        result in a much more scalable repository. If false, the repository will be lazily loaded as Entity 
                        classes are loaded by the JVM. The default value is false.