diff --git a/qserv/src/main/java/de/hsadmin/core/model/PersistenceManager.java b/qserv/src/main/java/de/hsadmin/core/model/PersistenceManager.java
index 928488a..dae38b0 100644
--- a/qserv/src/main/java/de/hsadmin/core/model/PersistenceManager.java
+++ b/qserv/src/main/java/de/hsadmin/core/model/PersistenceManager.java
@@ -1,9 +1,9 @@
 package de.hsadmin.core.model;
 
-import java.lang.System.Logger;
-import java.lang.System.Logger.Level;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 import javax.persistence.EntityManager;
 import javax.persistence.EntityManagerFactory;
@@ -15,7 +15,7 @@ public class PersistenceManager {
 	
 	private Map<String, EntityManagerFactory> persistenceUnits;
 	
-	private Logger logger;
+	private Logger logger = Logger.getLogger(PersistenceManager.class.getName());
 	
 	public static EntityManager getEntityManager(String persistUnitName) {
 		EntityManagerFactory emf = PersistenceManager.getInstance().getEMF(persistUnitName);