ENH: Less verbose login failure logging.

For #88

src/main/java/caosdb/server/resource/AuthenticationResource.java

@@ -23,6 +23,7 @@
 package caosdb.server.resource;
 
 import caosdb.server.CaosDBException;
+import caosdb.server.CaosDBServer;
 import caosdb.server.accessControl.AuthenticationUtils;
 import caosdb.server.accessControl.RealmUsernamePasswordToken;
 import caosdb.server.accessControl.UserSources;
@@ -108,12 +109,14 @@ public class AuthenticationResource extends AbstractCaosDBServerResource {
         }
         return success(null);
 
-      } catch (final CredentialsException e) {
-        getLogger().log(Level.INFO, "LOGIN_FAILED", e);
-      } catch (final AccountException e) {
+      } catch (final CredentialsException | AccountException e) {
         getLogger().log(Level.INFO, "LOGIN_FAILED", e);
       } catch (final AuthenticationException e) {
-        getLogger().log(Level.INFO, "LOGIN_FAILED", e);
+        if (CaosDBServer.isDebugMode()) {
+          getLogger().log(Level.INFO, "LOGIN_FAILED", e);
+        } else {
+          getLogger().log(Level.INFO, "LOGIN_FAILED\t" + e.getMessage());
+        }
       }
     }