Adjusted logging levels

diff --git a/src/main/java/org/eclipse/openk/portal/auth2/util/JwtHelper.java b/src/main/java/org/eclipse/openk/portal/auth2/util/JwtHelper.java
index afd04df..e87e19a 100644
--- a/src/main/java/org/eclipse/openk/portal/auth2/util/JwtHelper.java
+++ b/src/main/java/org/eclipse/openk/portal/auth2/util/JwtHelper.java

@@ -140,7 +140,7 @@
     // decode
     byte[] decoded = Base64Url.decode(jwtPayload);
     jwtPayload = new String(decoded, StandardCharsets.UTF_8);
-    logger.info(jwtPayload);
+    logger.debug(jwtPayload);
     return getJwtPayloadFromJson(jwtPayload);
   }
 
@@ -169,7 +169,7 @@
         con.setRequestProperty("Authorization", "Bearer " + token);
       }
       InputStream is = con.getInputStream();
-      try (BufferedReader rd = new BufferedReader(new InputStreamReader(is, "UTF-8"))) {
+      try (BufferedReader rd = new BufferedReader(new InputStreamReader(is, StandardCharsets.UTF_8))) {
         String line;
         while ((line = rd.readLine()) != null) {
           response.append(line);

diff --git a/src/main/java/org/eclipse/openk/portal/common/InitUserCacheJob.java b/src/main/java/org/eclipse/openk/portal/common/InitUserCacheJob.java
index a735bda..0d9be8f 100644
--- a/src/main/java/org/eclipse/openk/portal/common/InitUserCacheJob.java
+++ b/src/main/java/org/eclipse/openk/portal/common/InitUserCacheJob.java

@@ -26,7 +26,7 @@
 
     @Override
     public void init() throws ServletException {
-        LOGGER.info("InitUserCacheJob called");
+        LOGGER.debug("InitUserCacheJob called");
         TimerTask timerTask = new UserCacheTimerTask();
         Timer timer = new Timer();
         timer.scheduleAtFixedRate(timerTask, 500, BackendConfig.getInstance().getReloadUsersInSec()*1000L);

diff --git a/src/main/java/org/eclipse/openk/portal/controller/BackendController.java b/src/main/java/org/eclipse/openk/portal/controller/BackendController.java
index 495bd77..0ad7143 100644
--- a/src/main/java/org/eclipse/openk/portal/controller/BackendController.java
+++ b/src/main/java/org/eclipse/openk/portal/controller/BackendController.java

@@ -54,7 +54,7 @@
 
 
     public JwtToken authenticate(String credentials) throws PortalException {
-        LOGGER.info("authenticate() is called");
+        LOGGER.debug("authenticate() is called");
 
         // valuator will throw an exception if not valid
         inputDataValuator.checkCredentials(credentials);
@@ -73,23 +73,23 @@
             throw new PortalUnauthorized("Unknown User/Password");
         }
 
-        LOGGER.info("authenticate() succeeded.");
+        LOGGER.debug("authenticate() succeeded.");
         return token;
     }
 
     public VersionInfo getVersionInfo() {
-        LOGGER.info("getVersionInfo() is called");
+        LOGGER.debug("getVersionInfo() is called");
 
         String version = getClass().getPackage().getImplementationVersion();
         VersionInfo vi = new VersionInfo();
         vi.setBackendVersion(version);
 
-        LOGGER.info("getVersionInfo() is finished");
+        LOGGER.debug("getVersionInfo() is finished");
         return vi;
     }
 
     public List<UserModule> getUserModuleList() {
-        LOGGER.info("getUserModuleList() is called");
+        LOGGER.debug("getUserModuleList() is called");
         List<UserModule> umList = new ArrayList<>();
 
         for (int i=0; i<UserModule.getInstance().length; i++)
@@ -106,7 +106,7 @@
             umList.add(um);
         }
 
-        LOGGER.info("getUserModuleList() is finished");
+        LOGGER.debug("getUserModuleList() is finished");
         return umList;
     }
 

diff --git a/src/main/java/org/eclipse/openk/portal/controller/BaseWebService.java b/src/main/java/org/eclipse/openk/portal/controller/BaseWebService.java
index 38e7323..2131546 100644
--- a/src/main/java/org/eclipse/openk/portal/controller/BaseWebService.java
+++ b/src/main/java/org/eclipse/openk/portal/controller/BaseWebService.java

@@ -65,7 +65,7 @@
 
             return invokable.invoke();
         } catch (PortalException bee) {
-            logger.info("Caught BackendException: " + bee.getClass().getSimpleName());
+            logger.debug("Caught BackendException: " + bee.getClass().getSimpleName());
             return Response.status(bee.getHttpStatus()).entity(PortalExceptionMapper.toJson(bee))
                     .build();
 

diff --git a/src/main/java/org/eclipse/openk/portal/controller/TokenManager.java b/src/main/java/org/eclipse/openk/portal/controller/TokenManager.java
index 17d33d2..f38e01c 100644
--- a/src/main/java/org/eclipse/openk/portal/controller/TokenManager.java
+++ b/src/main/java/org/eclipse/openk/portal/controller/TokenManager.java

@@ -125,10 +125,10 @@
             if (sitem != null) {
                 JwtPayload payLoad = JwtHelper.getPayLoad(sitem.getJwtToken());
                 String user = (payLoad != null ? payLoad.getPreferredUsername() : null);
-                LOGGER.info("Session expired for User " + user);
+                LOGGER.debug("Session expired for User " + user);
             }
             registry.remove(token); // we're done
-            LOGGER.info("Invalid Token: " + token);
+            LOGGER.debug("Invalid Token: " + token);
             throw new PortalUnauthorized("Invalid Token");
         }