--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/states/WDifferencesState.java	Fri Sep 05 12:54:58 2014 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/states/WDifferencesState.java	Fri Sep 05 12:58:17 2014 +0200
@@ -48,8 +48,8 @@
 extends      DefaultState
 implements   FacetTypes
 {
-    /** The logger that is used in this state. */
-    private static Logger logger = Logger.getLogger(WDifferencesState.class);
+    /** The log that is used in this state. */
+    private static Logger log = Logger.getLogger(WDifferencesState.class);
 
     private static final String I18N_DIFFERENCES_FACET_NAME =
         "facet.w_differences";
@@ -109,7 +109,7 @@
      * Access the data (wkms) of an artifact, coded in mingle.
      */
     public WKms getWKms(String mingle, CallContext context) {
-        logger.debug("WDifferencesState.getWKms " + mingle);
+        log.debug("WDifferencesState.getWKms " + mingle);
         String[] def  = mingle.split(";");
         String   uuid = def[0];
         String   name = def[1];
@@ -120,10 +120,10 @@
                 (StaticWKmsArtifact) RiverUtils.getArtifact(
                     uuid,
                     context);
-            logger.debug("WDifferencesState obtain data from StaticWKms");
+            log.debug("WDifferencesState obtain data from StaticWKms");
             WKms wkms = staticWKms.getWKms(idx);
             if (wkms == null)
-                logger.error("No WKms from artifact.");
+                log.error("No WKms from artifact.");
             return wkms;
         }
 
@@ -132,39 +132,39 @@
             context);
 
         if (d4eArtifact == null) {
-            logger.warn("One of the artifacts (1) for diff calculation could not be loaded");
+            log.warn("One of the artifacts (1) for diff calculation could not be loaded");
             return null;
         }
 
         if (d4eArtifact instanceof WINFOArtifact) {
-            logger.debug("Get WKms from WINFOArtifact");
+            log.debug("Get WKms from WINFOArtifact");
             WINFOArtifact flys = (WINFOArtifact) d4eArtifact;
 
             WKms[] wkms = (WKms[]) flys.getWaterlevelData(context).
                                               getData();
             if (wkms == null || wkms.length == 0) {
-                logger.warn("no waterlevels in artifact");
+                log.warn("no waterlevels in artifact");
             }
             else if (wkms.length < idx+1) {
-                logger.warn("Not enough waterlevels in artifact.");
+                log.warn("Not enough waterlevels in artifact.");
                 return new WQKms();
             }
             return wkms[idx];
         }
         else if (d4eArtifact instanceof MINFOArtifact) {
-            logger.debug("Get WKms from MINFOArtifact");
+            log.debug("Get WKms from MINFOArtifact");
             CalculationResult r = (CalculationResult)
                 d4eArtifact.compute(context, ComputeType.ADVANCE, false);
         }
         else if (d4eArtifact instanceof FixationArtifact) {
-            logger.debug ("Get WKms from FixationArtifact.");
+            log.debug ("Get WKms from FixationArtifact.");
             CalculationResult r = (CalculationResult)
                 d4eArtifact.compute(context, ComputeType.ADVANCE, false);
             FixRealizingResult frR = (FixRealizingResult) r.getData();
             return frR.getWQKms()[idx];
         }
 
-        logger.error("Do not know how to handle (getWKms) minuend/subtrahend");
+        log.error("Do not know how to handle (getWKms) minuend/subtrahend");
         return null;
     }
 
@@ -193,7 +193,7 @@
         // Expected format is:
         // [42537f1e-3522-42ef-8968-635b03d8e9c6;longitudinal_section.w;0]#[1231f2-....]
         String diffids = winfo.getDataAsString("diffids");
-        logger.debug("WDifferencesState has: " + diffids);
+        log.debug("WDifferencesState has: " + diffids);
         String datas[] = diffids.split("#");
 
         // Validate the Data-Strings.
@@ -229,7 +229,7 @@
                      subtrahendWKms);
                 wkms.setName(facetName);
                 wkmss.add(wkms);
-                logger.debug("WKMSSubtraction happened");
+                log.debug("WKMSSubtraction happened");
             }
             if (facets != null) {
                 facets.add(new DifferenceCurveFacet(
@@ -259,10 +259,10 @@
         if (facets != null) {
             facets.add(new DataFacet(CSV, "CSV data"));
             facets.add(new DataFacet(PDF, "PDF data"));
-            logger.debug("Adding facets in WDifferencesState.");
+            log.debug("Adding facets in WDifferencesState.");
         }
         else {
-            logger.debug("Not adding facets in WDifferencesState.");
+            log.debug("Not adding facets in WDifferencesState.");
         }
 
         // TODO Evaluate whether null is okay as reports.