diff --git a/gclc/src/main/java/net/bigeon/gclc/command/ParametrizedCommand.java b/gclc/src/main/java/net/bigeon/gclc/command/ParametrizedCommand.java
index 5ec1ce6..d354c46 100644
--- a/gclc/src/main/java/net/bigeon/gclc/command/ParametrizedCommand.java
+++ b/gclc/src/main/java/net/bigeon/gclc/command/ParametrizedCommand.java
@@ -116,8 +116,7 @@ public abstract class ParametrizedCommand extends Command {
      * @param flag the boolean flag
      * @throws InvalidParameterException if the parameter is already defined as a
      *         string parameter */
-    protected final void addBooleanParameter(final String flag)
-            throws InvalidParameterException {
+    protected final void addBooleanParameter(final String flag) {
         data.addBooleanParameter(flag);
     }
 
@@ -127,8 +126,7 @@ public abstract class ParametrizedCommand extends Command {
      * @param needed if the parameter's absence should cause an exception
      * @throws InvalidParameterException if the parameter is already defined as a
      *         boolean parameter */
-    protected final void addStringParameter(final String flag, final boolean needed)
-            throws InvalidParameterException {
+    protected final void addStringParameter(final String flag, final boolean needed) {
         data.addStringParameter(flag, needed);
     }
 
diff --git a/gclc/src/main/java/net/bigeon/gclc/command/ParametrizedCommandData.java b/gclc/src/main/java/net/bigeon/gclc/command/ParametrizedCommandData.java
index 61b1421..9394524 100644
--- a/gclc/src/main/java/net/bigeon/gclc/command/ParametrizedCommandData.java
+++ b/gclc/src/main/java/net/bigeon/gclc/command/ParametrizedCommandData.java
@@ -120,7 +120,7 @@ public final class ParametrizedCommandData {
      * @param flag the boolean flag
      * @throws InvalidParameterException if the parameter is already defined as a
      *         string parameter */
-    public void addBooleanParameter(final String flag) throws InvalidParameterException {
+    public void addBooleanParameter(final String flag) {
         if (params.containsKey(flag) && stringParams.containsKey(flag)) {
             throw new InvalidParameterException("Parameter is already defined as string"); //$NON-NLS-1$
         }
@@ -134,8 +134,7 @@ public final class ParametrizedCommandData {
      * @param needed if the parameter's absence should cause an exception
      * @throws InvalidParameterException if the parameter is already defined as a
      *         boolean parameter */
-    public void addStringParameter(final String flag, final boolean needed)
-            throws InvalidParameterException {
+    public void addStringParameter(final String flag, final boolean needed) {
         if (params.containsKey(flag)) {
             checkParam(flag, needed);
             return;
@@ -149,9 +148,8 @@ public final class ParametrizedCommandData {
      * @param param the string parameter
      * @param needed if the parameter is needed
      * @throws InvalidParameterException if the new definition is invalid */
-    private void checkParam(final String param, final boolean needed)
-            throws InvalidParameterException {
-        Boolean val = stringParams.get(param);
+    private void checkParam(final String param, final boolean needed) {
+        final Boolean val = stringParams.get(param);
         if (val != null) {
             final Boolean need = Boolean.valueOf(needed || val.booleanValue());
             stringParams.put(param, need);
@@ -217,7 +215,7 @@ public final class ParametrizedCommandData {
      * @param param the parameter name
      * @return if the parameter is needed */
     public boolean isNeeded(final String param) {
-        Boolean val = params.get(param);
+        final Boolean val = params.get(param);
         return val != null && val.booleanValue();
     }