HHH-16548 add scanning of CWD with HibernatePersistenceConfiguration

Author: gavinking

hibernate-core/src/main/java/org/hibernate/boot/model/process/internal/ScanningCoordinator.java

@@ -99,7 +99,10 @@ private static Scanner buildScanner(BootstrapContext bootstrapContext, ClassLoad
 				return factory.getScanner( archiveDescriptorFactory );
 			}
 			else {
-				// todo: add a debug message that there is no Scanner?
+				if ( bootstrapContext.getScanOptions().canDetectUnlistedClassesInRoot() ) {
+					throw new IllegalStateException( "No ScannerFactory available"
+							+ " (add 'hibernate-scan-jandex' dependency or disable 'hibernate.archive.autodetection')" );
+				}
 				return new DisabledScanner();
 			}
 		}

hibernate-core/src/main/java/org/hibernate/jpa/boot/spi/PersistenceConfigurationDescriptor.java

@@ -4,6 +4,8 @@
  */
 package org.hibernate.jpa.boot.spi;
 
+import java.io.File;
+import java.net.MalformedURLException;
 import java.net.URL;
 import java.util.List;
 import java.util.Properties;
@@ -125,7 +127,14 @@ public ClassTransformer getClassTransformer() {
 
 	@Override
 	public URL getPersistenceUnitRootUrl() {
-		return null;
+		// When hibernate.archive.autodetection=class
+		// scan the CWD for entities (useful for tests)
+		try {
+			return new File( System.getProperty("user.dir") ).toURI().toURL();
+		}
+		catch ( MalformedURLException e ) {
+			return null;
+		}
 	}
 
 	@Override