diff -r 1e6f16fad3a5 -r 4f912cd42876 src/main/java/de/uapcore/lightpit/AbstractLightPITServlet.java
--- a/src/main/java/de/uapcore/lightpit/AbstractLightPITServlet.java	Thu Nov 05 13:37:48 2020 +0100
+++ b/src/main/java/de/uapcore/lightpit/AbstractLightPITServlet.java	Fri Nov 06 10:50:32 2020 +0100
@@ -53,7 +53,7 @@
 
     private static final Logger LOG = LoggerFactory.getLogger(AbstractLightPITServlet.class);
 
-    private static final String SITE_JSP = Functions.jspPath("site");
+    private static final String SITE_JSP = jspPath("site");
 
 
     @FunctionalInterface
@@ -102,7 +102,7 @@
      */
     private DataAccessObjects createDataAccessObjects(Connection connection) throws SQLException {
         final var df = (DataSourceProvider) getServletContext().getAttribute(DataSourceProvider.Companion.getSC_ATTR_NAME());
-        if (df.getDialect() == DatabaseDialect.Postgres) {
+        if (df.getDialect() == DataSourceProvider.Dialect.Postgres) {
             return new PGDataAccessObjects(connection);
         }
         throw new UnsupportedOperationException("Non-exhaustive if-else - this is a bug.");
@@ -238,7 +238,7 @@
      * @see Constants#REQ_ATTR_CONTENT_PAGE
      */
     protected void setContentPage(HttpServletRequest req, String pageName) {
-        req.setAttribute(Constants.REQ_ATTR_CONTENT_PAGE, Functions.jspPath(pageName));
+        req.setAttribute(Constants.REQ_ATTR_CONTENT_PAGE, jspPath(pageName));
     }
 
     /**
@@ -249,7 +249,7 @@
      * @see Constants#REQ_ATTR_NAVIGATION
      */
     protected void setNavigationMenu(HttpServletRequest req, String jspName) {
-        req.setAttribute(Constants.REQ_ATTR_NAVIGATION, Functions.jspPath(jspName));
+        req.setAttribute(Constants.REQ_ATTR_NAVIGATION, jspPath(jspName));
     }
 
     /**
@@ -259,7 +259,7 @@
      */
     protected void setRedirectLocation(HttpServletRequest req, String location) {
         if (location.startsWith("./")) {
-            location = location.replaceFirst("\\./", Functions.baseHref(req));
+            location = location.replaceFirst("\\./", baseHref(req));
         }
         req.setAttribute(Constants.REQ_ATTR_REDIRECT_LOCATION, location);
     }
@@ -277,7 +277,7 @@
      * @param stylesheet the name of the stylesheet
      */
     public void setStylesheet(HttpServletRequest req, String stylesheet) {
-        req.setAttribute(Constants.REQ_ATTR_STYLESHEET, Functions.enforceExt(stylesheet, ".css"));
+        req.setAttribute(Constants.REQ_ATTR_STYLESHEET, enforceExt(stylesheet, ".css"));
     }
 
     /**
@@ -384,12 +384,32 @@
         req.getRequestDispatcher(SITE_JSP).forward(req, resp);
     }
 
+    protected Optional<String[]> availableLanguages() {
+        return Optional.ofNullable(getServletContext().getInitParameter(Constants.CTX_ATTR_LANGUAGES)).map((x) -> x.split("\\s*,\\s*"));
+    }
+
+    private static String baseHref(HttpServletRequest req) {
+        return String.format("%s://%s:%d%s/",
+                req.getScheme(),
+                req.getServerName(),
+                req.getServerPort(),
+                req.getContextPath());
+    }
+
+    private static String enforceExt(String filename, String ext) {
+        return filename.endsWith(ext) ? filename : filename + ext;
+    }
+
+    private static String jspPath(String filename) {
+        return enforceExt(Constants.JSP_PATH_PREFIX + filename, ".jsp");
+    }
+
     private void doProcess(HttpMethod method, HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
 
         // choose the requested language as session language (if available) or fall back to english, otherwise
         HttpSession session = req.getSession();
         if (session.getAttribute(Constants.SESSION_ATTR_LANGUAGE) == null) {
-            Optional<List<String>> availableLanguages = Functions.availableLanguages(getServletContext()).map(Arrays::asList);
+            Optional<List<String>> availableLanguages = availableLanguages().map(Arrays::asList);
             Optional<Locale> reqLocale = Optional.of(req.getLocale());
             Locale sessionLocale = reqLocale.filter((rl) -> availableLanguages.map((al) -> al.contains(rl.getLanguage())).orElse(false)).orElse(Locale.ENGLISH);
             session.setAttribute(Constants.SESSION_ATTR_LANGUAGE, sessionLocale);
@@ -401,8 +421,8 @@
         }
 
         // set some internal request attributes
-        final String fullPath = Functions.fullPath(req);
-        req.setAttribute(Constants.REQ_ATTR_BASE_HREF, Functions.baseHref(req));
+        final String fullPath = req.getServletPath() + Optional.ofNullable(req.getPathInfo()).orElse("");
+        req.setAttribute(Constants.REQ_ATTR_BASE_HREF, baseHref(req));
         req.setAttribute(Constants.REQ_ATTR_PATH, fullPath);
         req.setAttribute(Constants.REQ_ATTR_RESOURCE_BUNDLE, getResourceBundleName());