diff -r 4ec7f2600c83 -r 24a3596b8f98 src/main/java/de/uapcore/lightpit/AbstractLightPITServlet.java
--- a/src/main/java/de/uapcore/lightpit/AbstractLightPITServlet.java	Sat May 30 15:28:27 2020 +0200
+++ b/src/main/java/de/uapcore/lightpit/AbstractLightPITServlet.java	Sat May 30 18:05:06 2020 +0200
@@ -39,10 +39,7 @@
 import javax.servlet.http.HttpServletResponse;
 import javax.servlet.http.HttpSession;
 import java.io.IOException;
-import java.lang.reflect.Constructor;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-import java.lang.reflect.Modifier;
+import java.lang.reflect.*;
 import java.sql.Connection;
 import java.sql.SQLException;
 import java.util.*;
@@ -280,30 +277,44 @@
      * @return the parameter value or an empty optional, if no parameter with the specified name was found
      */
     protected <T> Optional<T> getParameter(HttpServletRequest req, Class<T> clazz, String name) {
-        final String paramValue = req.getParameter(name);
-        if (paramValue == null) return Optional.empty();
-        if (clazz.equals(Boolean.class)) {
-            if (paramValue.toLowerCase().equals("false") || paramValue.equals("0")) {
-                return Optional.of((T)Boolean.FALSE);
-            } else {
-                return Optional.of((T)Boolean.TRUE);
+        if (clazz.isArray()) {
+            final String[] paramValues = req.getParameterValues(name);
+            int len = paramValues == null ? 0 : paramValues.length;
+            final var array = (T) Array.newInstance(clazz.getComponentType(), len);
+            for (int i = 0 ; i < len ; i++) {
+                try {
+                    final Constructor<?> ctor = clazz.getComponentType().getConstructor(String.class);
+                    Array.set(array, i, ctor.newInstance(paramValues[i]));
+                } catch (ReflectiveOperationException e) {
+                    throw new RuntimeException(e);
+                }
+            }
+            return Optional.of(array);
+        } else {
+            final String paramValue = req.getParameter(name);
+            if (paramValue == null) return Optional.empty();
+            if (clazz.equals(Boolean.class)) {
+                if (paramValue.toLowerCase().equals("false") || paramValue.equals("0")) {
+                    return Optional.of((T) Boolean.FALSE);
+                } else {
+                    return Optional.of((T) Boolean.TRUE);
+                }
+            }
+            if (clazz.equals(String.class)) return Optional.of((T) paramValue);
+            if (java.sql.Date.class.isAssignableFrom(clazz)) {
+                try {
+                    return Optional.of((T) java.sql.Date.valueOf(paramValue));
+                } catch (IllegalArgumentException ex) {
+                    return Optional.empty();
+                }
+            }
+            try {
+                final Constructor<T> ctor = clazz.getConstructor(String.class);
+                return Optional.of(ctor.newInstance(paramValue));
+            } catch (ReflectiveOperationException e) {
+                throw new RuntimeException(e);
             }
         }
-        if (clazz.equals(String.class)) return Optional.of((T) paramValue);
-        if (java.sql.Date.class.isAssignableFrom(clazz)) {
-            try {
-                return Optional.of((T)java.sql.Date.valueOf(paramValue));
-            } catch (IllegalArgumentException ex) {
-                return Optional.empty();
-            }
-        }
-        try {
-            final Constructor<T> ctor = clazz.getConstructor(String.class);
-            return Optional.of(ctor.newInstance(paramValue));
-        } catch (ReflectiveOperationException e) {
-            throw new RuntimeException(e);
-        }
-
     }
 
     /**