Fixes #2501

Author: jfarcand

modules/cpr/src/main/java/org/atmosphere/cpr/AtmosphereRequestImpl.java

@@ -1417,7 +1417,12 @@ public static AtmosphereRequest wrap(HttpServletRequest request) {
         String s;
         while (e.hasMoreElements()) {
             s = e.nextElement();
-            b.localAttributes.put(s, attributeWithoutException(request, s));
+            Object value = attributeWithoutException(request, s);
+            if (value != null) { // Check for null values
+                b.localAttributes.put(s, value);
+            } else {
+                logger.warn("Attribute {} is null", s);
+            }
         }
         return b.request(request).build();
     }

modules/cpr/src/test/java/org/atmosphere/cpr/AtmosphereRequestTest.java

@@ -24,13 +24,17 @@
 import javax.servlet.ServletConfig;
 import javax.servlet.ServletContext;
 import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
 import java.io.IOException;
+import java.util.Arrays;
+import java.util.Collections;
 import java.util.Enumeration;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.concurrent.atomic.AtomicReference;
 
 import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
 import static org.testng.Assert.assertEquals;
 import static org.testng.Assert.assertFalse;
 import static org.testng.Assert.assertNotNull;
@@ -335,4 +339,17 @@ public void testForceContentType() throws Exception {
         assertNull(request.getContentType());
     }
 
+    @Test
+    public void testWrapMethodWithNullAttributeValue() throws IOException, ServletException {
+        HttpServletRequest mockRequest = mock(HttpServletRequest.class);
+        when(mockRequest.getAttributeNames()).thenReturn(Collections.enumeration(Arrays.asList("org.eclipse.jetty.multipartConfig")));
+        when(mockRequest.getAttribute("org.eclipse.jetty.multipartConfig")).thenReturn(null);
+
+        AtmosphereRequest wrappedRequest = AtmosphereRequestImpl.wrap(mockRequest);
+
+        assertNotNull(wrappedRequest, "Wrapped request should not be null");
+        assertNull(wrappedRequest.getAttribute("org.eclipse.jetty.multipartConfig"), "Attribute value should be null");
+    }
+
+
 }