Use parameterized map for parameters.

src/main/java/org/torproject/onionoo/server/HttpServletRequestWrapper.java

@@ -20,8 +20,7 @@ public class HttpServletRequestWrapper {
     return this.request.getRequestURI();
   }
 
-  @SuppressWarnings("rawtypes")
-  protected Map getParameterMap() {
+  protected Map<String, String[]> getParameterMap() {
     return this.request.getParameterMap();
   }
 

src/main/java/org/torproject/onionoo/server/ResourceServlet.java

@@ -133,10 +133,10 @@ public class ResourceServlet extends HttpServlet {
     /* Extract parameters either from the old-style URI or from request
      * parameters. */
     Map<String, String> parameterMap = new HashMap<>();
-    for (Object parameterKey : request.getParameterMap().keySet()) {
+    for (String parameterKey : request.getParameterMap().keySet()) {
       String[] parameterValues =
-          request.getParameterValues((String) parameterKey);
-      parameterMap.put((String) parameterKey, parameterValues[0]);
+          request.getParameterValues(parameterKey);
+      parameterMap.put(parameterKey, parameterValues[0]);
     }
 
     /* Make sure that the request doesn't contain any unknown

src/test/java/org/torproject/onionoo/server/ResourceServletTest.java

@@ -64,8 +64,7 @@ public class ResourceServletTest {
       return this.requestUri;
     }
 
-    @SuppressWarnings("rawtypes")
-    protected Map getParameterMap() {
+    protected Map<String, String[]> getParameterMap() {
       return this.parameterMap;
     }