diff -r 9a81a11be70e -r e71ae69c68c0 src/main/kotlin/de/uapcore/lightpit/AbstractServlet.kt
--- a/src/main/kotlin/de/uapcore/lightpit/AbstractServlet.kt	Sun Dec 12 18:16:46 2021 +0100
+++ b/src/main/kotlin/de/uapcore/lightpit/AbstractServlet.kt	Wed Dec 15 19:56:05 2021 +0100
@@ -34,7 +34,9 @@
 import javax.servlet.http.HttpServletRequest
 import javax.servlet.http.HttpServletResponse
 
-abstract class AbstractServlet : LoggingTrait, HttpServlet() {
+abstract class AbstractServlet : HttpServlet() {
+    
+    protected val logger = MyLogger()
 
     /**
      * Contains the GET request mappings.
@@ -68,7 +70,7 @@
             Pair(PathPattern(requestPath), ::notFound)
         } else {
             if (candidates.size > 1) {
-                logger().warn("Ambiguous mapping for request path '{}'", requestPath)
+                logger.warn("Ambiguous mapping for request path '{0}'", requestPath)
             }
             candidates.entries.first().toPair()
         }
@@ -82,7 +84,7 @@
     ) {
         val params = mapping.first.obtainPathParameters(sanitizedRequestPath(req))
         val method = mapping.second
-        logger().trace("invoke {}", method)
+        logger.trace("invoke {0}", method)
         method(HttpRequest(req, resp, params), dao)
     }
 
@@ -105,13 +107,13 @@
             val sessionLocale = if (availableLanguages.contains(reqLocale)) reqLocale else availableLanguages.first()
             session.setAttribute(Constants.SESSION_ATTR_LANGUAGE, sessionLocale)
             resp.locale = sessionLocale
-            logger().debug(
-                "Setting language for new session {}: {}", session.id, sessionLocale.displayLanguage
+            logger.debug(
+                "Setting language for new session {0}: {1}", session.id, sessionLocale.displayLanguage
             )
         } else {
             val sessionLocale = session.getAttribute(Constants.SESSION_ATTR_LANGUAGE) as Locale
             resp.locale = sessionLocale
-            logger().trace("Continuing session {} with language {}", session.id, sessionLocale)
+            logger.trace("Continuing session {0} with language {1}", session.id, sessionLocale)
         }
 
         // set some internal request attributes
@@ -150,8 +152,8 @@
                     invokeMapping(findMapping(mappings, req), req, resp, dao)
                     connection.commit()
                 } catch (ex: SQLException) {
-                    logger().warn("Database transaction failed (Code {}): {}", ex.errorCode, ex.message)
-                    logger().debug("Details: ", ex)
+                    logger.warn("Database transaction failed (Code {0}): {1}", ex.errorCode, ex.message)
+                    logger.debug("Details: ", ex)
                     resp.sendError(
                         HttpServletResponse.SC_INTERNAL_SERVER_ERROR,
                         "Unhandled Transaction Error - Code: " + ex.errorCode
@@ -160,8 +162,8 @@
                 }
             }
         } catch (ex: SQLException) {
-            logger().error("Severe Database Exception (Code {}): {}", ex.errorCode, ex.message)
-            logger().debug("Details: ", ex)
+            logger.error("Severe Database Exception (Code {0}): {1}", ex.errorCode, ex.message)
+            logger.debug("Details: ", ex)
             resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR, "Database Error - Code: " + ex.errorCode)
         }
     }