diff --git a/configuration/pom.xml b/configuration/pom.xml
index debb8f0..d75b26b 100644
--- a/configuration/pom.xml
+++ b/configuration/pom.xml
@@ -25,5 +25,12 @@
             <artifactId>junit</artifactId>
             <scope>test</scope>
         </dependency>
+        
+        <dependency>
+            <groupId>log4j</groupId>
+            <artifactId>log4j</artifactId>
+            <scope>provided</scope>
+        </dependency>
+                
     </dependencies>
 </project>
diff --git a/configuration/src/main/java/de/muehlencord/shared/configuration/DefaultConfiguration.java b/configuration/src/main/java/de/muehlencord/shared/configuration/DefaultConfiguration.java
index b89d8e2..f4fe1dd 100644
--- a/configuration/src/main/java/de/muehlencord/shared/configuration/DefaultConfiguration.java
+++ b/configuration/src/main/java/de/muehlencord/shared/configuration/DefaultConfiguration.java
@@ -33,9 +33,11 @@ public class DefaultConfiguration<T, V extends T> implements Configuration<T, V>
      *
      * @return the map of parameters and values
      */
+    /*
     protected Map<Parameter<T>, V> getParameterMap() {
         return parameterMap;
     }
+    */
 
     /**
      * adds a new parameter to the configuration
@@ -95,9 +97,11 @@ public class DefaultConfiguration<T, V extends T> implements Configuration<T, V>
      * @throws ConfigurationException if the parameter is not defined
      */    
     public void setParameterValue (Map<Parameter<T>, V> map) throws ConfigurationException {        
-        for ( Parameter<T> key : map.keySet()) {
+        for ( Map.Entry<Parameter<T>,V> entry : map.entrySet()) {
+            Parameter<T> key = entry.getKey();
+            V value = entry.getValue();
             if (parameterMap.containsKey(key)) {
-                parameterMap.put (key, map.get(key));
+                parameterMap.put (key, value); 
             } else {
                throw new ConfigurationException("Parameter " + key.getName() + " not defined"); 
             }
diff --git a/configuration/src/main/java/de/muehlencord/shared/configuration/Parameter.java b/configuration/src/main/java/de/muehlencord/shared/configuration/Parameter.java
index dc04045..6c9b3be 100644
--- a/configuration/src/main/java/de/muehlencord/shared/configuration/Parameter.java
+++ b/configuration/src/main/java/de/muehlencord/shared/configuration/Parameter.java
@@ -2,6 +2,7 @@ package de.muehlencord.shared.configuration;
 
 import java.util.LinkedList;
 import java.util.List;
+import org.apache.log4j.Logger;
 
 /**
  *
@@ -9,6 +10,8 @@ import java.util.List;
  * @author jomu
  */
 public abstract class Parameter<T> {
+    
+    private final static Logger LOGGER = Logger.getLogger(Parameter.class); 
 
     /** the name of the parameter */
     private String name;
@@ -133,6 +136,7 @@ public abstract class Parameter<T> {
                 validator.validate(value);
                 return true;
             } catch (ValidationException ex) {
+                LOGGER.debug (ex.toString(), ex); 
                 return false;
             }
         }
diff --git a/configuration/src/main/java/de/muehlencord/shared/configuration/validator/StringValueListValidator.java b/configuration/src/main/java/de/muehlencord/shared/configuration/validator/StringValueListValidator.java
index 1a704c6..567253f 100644
--- a/configuration/src/main/java/de/muehlencord/shared/configuration/validator/StringValueListValidator.java
+++ b/configuration/src/main/java/de/muehlencord/shared/configuration/validator/StringValueListValidator.java
@@ -2,7 +2,6 @@ package de.muehlencord.shared.configuration.validator;
 
 import de.muehlencord.shared.configuration.ValidationException;
 import de.muehlencord.shared.configuration.Validator;
-import java.util.Arrays;
 import static java.util.Arrays.asList;
 import java.util.LinkedList;
 import java.util.List;