Update WebService.

Author: gk-brown

kilo-server/src/main/java/org/httprpc/kilo/WebService.java

@@ -873,6 +873,8 @@ public void init() throws ServletException {
 
             var resource = root;
 
+            var n = 0;
+
             var resourcePath = method.getAnnotation(ResourcePath.class);
 
             if (resourcePath != null) {
@@ -886,9 +888,21 @@ public void init() throws ServletException {
                     }
 
                     resource = resource.resources.computeIfAbsent(component, key -> new Resource());
+
+                    if (component.equals(KEY_PLACEHOLDER)) {
+                        n++;
+                    }
                 }
             }
 
+            if (verb == Verb.POST || verb == Verb.PUT) {
+                n++;
+            }
+
+            if (method.getParameterCount() < n) {
+                throw new ServletException("Invalid parameter count.");
+            }
+
             resource.handlerLists.computeIfAbsent(verb, key -> new LinkedList<>()).add(method);
         }