diff -r 822b7e3d064d -r b3f14cd4f3ab src/main/java/de/uapcore/lightpit/AbstractLightPITServlet.java
--- a/src/main/java/de/uapcore/lightpit/AbstractLightPITServlet.java	Fri Oct 23 20:34:57 2020 +0200
+++ b/src/main/java/de/uapcore/lightpit/AbstractLightPITServlet.java	Sat Oct 24 12:09:08 2020 +0200
@@ -101,11 +101,11 @@
      * @return a set of data access objects
      */
     private DataAccessObjects createDataAccessObjects(Connection connection) throws SQLException {
-        final var df = (DatabaseFacade) getServletContext().getAttribute(DatabaseFacade.SC_ATTR_NAME);
-        if (df.getSQLDialect() == DatabaseFacade.Dialect.Postgres) {
+        final var df = (DataSourceProvider) getServletContext().getAttribute(DataSourceProvider.Companion.getSC_ATTR_NAME());
+        if (df.getDialect() == DatabaseDialect.Postgres) {
             return new PGDataAccessObjects(connection);
         }
-        throw new AssertionError("Non-exhaustive if-else - this is a bug.");
+        throw new UnsupportedOperationException("Non-exhaustive if-else - this is a bug.");
     }
 
     private ResponseType invokeMapping(Map.Entry<PathPattern, Method> mapping, HttpServletRequest req, HttpServletResponse resp, DataAccessObjects dao) throws IOException {
@@ -434,7 +434,7 @@
         }
 
         // obtain a connection and create the data access objects
-        final var db = (DatabaseFacade) req.getServletContext().getAttribute(DatabaseFacade.SC_ATTR_NAME);
+        final var db = (DataSourceProvider) req.getServletContext().getAttribute(DataSourceProvider.Companion.getSC_ATTR_NAME());
         final var ds = db.getDataSource();
         if (ds == null) {
             resp.sendError(HttpServletResponse.SC_SERVICE_UNAVAILABLE, "JNDI DataSource lookup failed. See log for details.");