public JuEmfUtil build() {
AssertUtil.assertNotEmpty("PersistenceUnit name must be specified", this.persistenceUnitName);
// Build a unique identifier String to see if we already have this EmfUtil available.
XString xs = new XString();
xs.addItems("|", this.persistenceUnitName, this.connectionUrl);
if (!JuEmfUtilBuilder.emfUtils.containsKey(xs)) {
// Create a new EmfUtil
String dialect = null;