serialization issue - logger should be a static field

converter-CellDesigner/src/main/java/lcsb/mapviewer/converter/model/celldesigner/structure/CellDesignerGene.java

@@ -23,7 +23,11 @@ import lcsb.mapviewer.model.map.species.field.TranscriptionSite;
  * 
  */
 public class CellDesignerGene extends CellDesignerSpecies<Gene> {
-  Logger logger = Logger.getLogger(CellDesignerGene.class);
+  /**
+   * Default class logger.
+   */
+  @SuppressWarnings("unused")
+  private static Logger logger = Logger.getLogger(CellDesignerGene.class);
 
   /**
    *