diff --git a/li.strolch.model/src/main/java/li/strolch/model/parameter/BooleanParameter.java b/li.strolch.model/src/main/java/li/strolch/model/parameter/BooleanParameter.java
index eb1a278c5..778986569 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/parameter/BooleanParameter.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/parameter/BooleanParameter.java
@@ -53,6 +53,7 @@ public class BooleanParameter extends AbstractParameter<Boolean> {
 		return this.value.toString();
 	}
 
+	@SuppressWarnings("unchecked")
 	@Override
 	public Boolean getValue() {
 		return this.value;
diff --git a/li.strolch.model/src/main/java/li/strolch/model/parameter/DateParameter.java b/li.strolch.model/src/main/java/li/strolch/model/parameter/DateParameter.java
index 197ad8e01..a6f47029a 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/parameter/DateParameter.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/parameter/DateParameter.java
@@ -55,6 +55,7 @@ public class DateParameter extends AbstractParameter<Date> {
 		return ISO8601FormatFactory.getInstance().formatDate(this.value);
 	}
 
+	@SuppressWarnings("unchecked")
 	@Override
 	public Date getValue() {
 		return this.value;
diff --git a/li.strolch.model/src/main/java/li/strolch/model/parameter/DurationParameter.java b/li.strolch.model/src/main/java/li/strolch/model/parameter/DurationParameter.java
index 2d4fb25ef..96c76cbcd 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/parameter/DurationParameter.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/parameter/DurationParameter.java
@@ -53,6 +53,7 @@ public class DurationParameter extends AbstractParameter<Long> {
 		return ISO8601FormatFactory.getInstance().formatDuration(this.value);
 	}
 
+	@SuppressWarnings("unchecked")
 	@Override
 	public Long getValue() {
 		return this.value;
diff --git a/li.strolch.model/src/main/java/li/strolch/model/parameter/FloatListParameter.java b/li.strolch.model/src/main/java/li/strolch/model/parameter/FloatListParameter.java
index 84a9ce307..38485392f 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/parameter/FloatListParameter.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/parameter/FloatListParameter.java
@@ -75,6 +75,7 @@ public class FloatListParameter extends AbstractParameter<List<Double>> implemen
 		return sb.toString();
 	}
 
+	@SuppressWarnings("unchecked")
 	@Override
 	public List<Double> getValue() {
 		return new ArrayList<>(this.value);
diff --git a/li.strolch.model/src/main/java/li/strolch/model/parameter/FloatParameter.java b/li.strolch.model/src/main/java/li/strolch/model/parameter/FloatParameter.java
index eec001acb..6e7ffc13e 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/parameter/FloatParameter.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/parameter/FloatParameter.java
@@ -54,6 +54,7 @@ public class FloatParameter extends AbstractParameter<Double> {
 		return Double.toString(this.value);
 	}
 
+	@SuppressWarnings("unchecked")
 	@Override
 	public Double getValue() {
 		return this.value;
diff --git a/li.strolch.model/src/main/java/li/strolch/model/parameter/IntegerListParameter.java b/li.strolch.model/src/main/java/li/strolch/model/parameter/IntegerListParameter.java
index e17bc29bc..2cfc0064a 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/parameter/IntegerListParameter.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/parameter/IntegerListParameter.java
@@ -75,6 +75,7 @@ public class IntegerListParameter extends AbstractParameter<List<Integer>> imple
 		return sb.toString();
 	}
 
+	@SuppressWarnings("unchecked")
 	@Override
 	public List<Integer> getValue() {
 		return new ArrayList<>(this.value);
diff --git a/li.strolch.model/src/main/java/li/strolch/model/parameter/IntegerParameter.java b/li.strolch.model/src/main/java/li/strolch/model/parameter/IntegerParameter.java
index 18b28d2f5..1461ce979 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/parameter/IntegerParameter.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/parameter/IntegerParameter.java
@@ -58,6 +58,7 @@ public class IntegerParameter extends AbstractParameter<Integer> {
 		return Integer.toString(this.value);
 	}
 
+	@SuppressWarnings("unchecked")
 	@Override
 	public Integer getValue() {
 		return this.value;
diff --git a/li.strolch.model/src/main/java/li/strolch/model/parameter/LongListParameter.java b/li.strolch.model/src/main/java/li/strolch/model/parameter/LongListParameter.java
index d6ee515a5..40ff1f6b2 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/parameter/LongListParameter.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/parameter/LongListParameter.java
@@ -75,6 +75,7 @@ public class LongListParameter extends AbstractParameter<List<Long>> implements
 		return sb.toString();
 	}
 
+	@SuppressWarnings("unchecked")
 	@Override
 	public List<Long> getValue() {
 		return new ArrayList<>(this.value);
diff --git a/li.strolch.model/src/main/java/li/strolch/model/parameter/LongParameter.java b/li.strolch.model/src/main/java/li/strolch/model/parameter/LongParameter.java
index d8a068cf2..6c6081897 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/parameter/LongParameter.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/parameter/LongParameter.java
@@ -53,6 +53,7 @@ public class LongParameter extends AbstractParameter<Long> {
 		return this.value.toString();
 	}
 
+	@SuppressWarnings("unchecked")
 	@Override
 	public Long getValue() {
 		return this.value;
diff --git a/li.strolch.model/src/main/java/li/strolch/model/parameter/Parameter.java b/li.strolch.model/src/main/java/li/strolch/model/parameter/Parameter.java
index 32db69d88..d75d98b22 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/parameter/Parameter.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/parameter/Parameter.java
@@ -45,7 +45,7 @@ public interface Parameter<T> extends StrolchElement, Comparable<Parameter<?>> {
 	 * 
 	 * @return
 	 */
-	public T getValue();
+	public <U extends T>  U getValue();
 
 	/**
 	 * the value of the parameter
diff --git a/li.strolch.model/src/main/java/li/strolch/model/parameter/StringListParameter.java b/li.strolch.model/src/main/java/li/strolch/model/parameter/StringListParameter.java
index 18e1311b8..b59c05169 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/parameter/StringListParameter.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/parameter/StringListParameter.java
@@ -75,6 +75,7 @@ public class StringListParameter extends AbstractParameter<List<String>> impleme
 		return sb.toString();
 	}
 
+	@SuppressWarnings("unchecked")
 	@Override
 	public List<String> getValue() {
 		return new ArrayList<>(this.value);
diff --git a/li.strolch.model/src/main/java/li/strolch/model/parameter/StringParameter.java b/li.strolch.model/src/main/java/li/strolch/model/parameter/StringParameter.java
index b6cd8979e..a473b1270 100644
--- a/li.strolch.model/src/main/java/li/strolch/model/parameter/StringParameter.java
+++ b/li.strolch.model/src/main/java/li/strolch/model/parameter/StringParameter.java
@@ -54,6 +54,7 @@ public class StringParameter extends AbstractParameter<String> {
 		return StrolchValueType.STRING.getType();
 	}
 
+	@SuppressWarnings("unchecked")
 	@Override
 	public String getValue() {
 		return this.value;