diff --git a/java/src/org/jrack/JRack.java b/java/src/org/jrack/JRack.java
index 018d8ce..035b481 100644
--- a/java/src/org/jrack/JRack.java
+++ b/java/src/org/jrack/JRack.java
@@ -9,6 +9,8 @@
 import java.io.IOException;
 import java.util.Arrays;
 import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.Map;
 
 public abstract class JRack implements Rack {
     private static final JRackLogger logger = new Slf4jLogger(RackServlet.class.getName());
@@ -43,6 +45,7 @@ public Context<String> getEnvironment(HttpServletRequest req) {
         environment.with(Rack.SERVER_PORT, req.getServerPort());
         environment.with(Rack.SCRIPT_NAME, servletPath);
         environment.with(Rack.REQUEST, req);
+        environment.with(Rack.PARAMS, modifiableRequestParameterMap(req.getParameterMap()));
         environment.with(Rack.RACK_BROWSER_LOCALE, req.getLocale());
         environment.with(Rack.COOKIES, req.getCookies());
 
@@ -61,4 +64,19 @@ public Context<String> getEnvironment(HttpServletRequest req) {
 
         return environment;
     }
+
+    /**
+     * create a new modifiable parameter map that can be updated by the client if need be
+     *
+     * @param parameterMap the request parameters map
+     * @return a new Map<String, String[]> map or null if the parameterMap is empty or null
+     */
+    private Map<String, String[]> modifiableRequestParameterMap(Map parameterMap) {
+        Map<String, String[]> map = null;
+        if (parameterMap != null && !parameterMap.isEmpty()) {
+            map = new HashMap<String, String[]>();
+            map.putAll(parameterMap);
+        }
+        return map;
+    }
 }
diff --git a/java/src/org/jrack/Rack.java b/java/src/org/jrack/Rack.java
index 5e831a5..e4414d5 100644
--- a/java/src/org/jrack/Rack.java
+++ b/java/src/org/jrack/Rack.java
@@ -70,6 +70,7 @@ public interface Rack {
     public static final String RACK_RUN_ONCE = "rack.run_once";
     public static final String RACK_LOGGER = "rack.logger";
     public static final String RACK_BROWSER_LOCALE = "rack.browser.locale";
+    public static final String PARAMS = "params";
 
     /**
      * The single method implemented by all Rack4Java applications