--- a/artifacts/src/main/java/org/dive4elements/river/artifacts/model/StaticPorosityCacheKey.java	Wed Apr 30 17:16:57 2014 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/artifacts/model/StaticPorosityCacheKey.java	Wed Apr 30 17:23:28 2014 +0200
@@ -8,22 +8,25 @@
 
 package org.dive4elements.river.artifacts.model;
 
+import java.io.Serializable;
+
 
 public class StaticPorosityCacheKey
+implements   Serializable
 {
    public static final String CACHE_NAME = "porosity-table-static";
 
-    private int porosity_id;
+    private int porosityId;
 
     public StaticPorosityCacheKey(
-        int porosity_id
+        int porosityId
     ) {
-        this.porosity_id = porosity_id;
+        this.porosityId = porosityId;
     }
 
     @Override
     public int hashCode() {
-        return (String.valueOf(porosity_id)).hashCode();
+        return (String.valueOf(porosityId)).hashCode();
     }
 
     @Override
@@ -32,6 +35,6 @@
             return false;
         }
         StaticPorosityCacheKey o = (StaticPorosityCacheKey) other;
-        return this.porosity_id == o.porosity_id;
+        return this.porosityId == o.porosityId;
     }
 }