Index: src/main/java/ch/qos/logback/access/spi/AccessEvent.java
===================================================================
--- src/main/java/ch/qos/logback/access/spi/AccessEvent.java	(revision 1613)
+++ src/main/java/ch/qos/logback/access/spi/AccessEvent.java	(working copy)
@@ -1,21 +1,15 @@
 package ch.qos.logback.access.spi;
 
-import java.io.Serializable;
-import java.util.ArrayList;
-import java.util.Enumeration;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Vector;
+import ch.qos.logback.access.Constants;
+import ch.qos.logback.access.pattern.AccessConverter;
+import ch.qos.logback.access.servlet.Util;
 
 import javax.servlet.http.Cookie;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
+import java.io.Serializable;
+import java.util.*;
 
-import ch.qos.logback.access.Constants;
-import ch.qos.logback.access.pattern.AccessConverter;
-import ch.qos.logback.access.servlet.Util;
-
 // Contributors:  Joern Huxhorn (see also bug #110)
 
 /**
@@ -29,7 +23,7 @@
  */
 public class AccessEvent implements Serializable {
 
-  private static final long serialVersionUID = -3118194368414470960L;
+  private static final long serialVersionUID = 866718993618836343L;
 
   public final static String NA = "-";
   public final static String[] NA_STRING_ARRAY = new String[] { AccessEvent.NA };
@@ -68,7 +62,7 @@
   private long timeStamp = 0;
 
   public AccessEvent(HttpServletRequest httpRequest,
-      HttpServletResponse httpResponse, ServerAdapter adapter) {
+                     HttpServletResponse httpResponse, ServerAdapter adapter) {
     this.httpRequest = httpRequest;
     this.httpResponse = httpResponse;
     this.timeStamp = System.currentTimeMillis();
@@ -339,47 +333,49 @@
       return requestContent;
     }
 
-    if (Util.isFormUrlEncoded(httpRequest)) {
-      StringBuffer buf = new StringBuffer();
+    if (httpRequest != null) {
+      if (Util.isFormUrlEncoded(httpRequest)) {
+        StringBuffer buf = new StringBuffer();
 
-      Enumeration pramEnumeration = httpRequest.getParameterNames();
+        Enumeration pramEnumeration = httpRequest.getParameterNames();
 
-      // example: id=1234&user=cgu
-      // number=1233&x=1
-      int count = 0;
-      try {
-        while (pramEnumeration.hasMoreElements()) {
+        // example: id=1234&user=cgu
+        // number=1233&x=1
+        int count = 0;
+        try {
+          while (pramEnumeration.hasMoreElements()) {
 
-          String key = (String) pramEnumeration.nextElement();
-          if (count++ != 0) {
-            buf.append("&");
+            String key = (String) pramEnumeration.nextElement();
+            if (count++ != 0) {
+              buf.append("&");
+            }
+            buf.append(key);
+            buf.append("=");
+            String val = httpRequest.getParameter(key);
+            if (val != null) {
+              buf.append(val);
+            } else {
+              buf.append("");
+            }
           }
-          buf.append(key);
-          buf.append("=");
-          String val = httpRequest.getParameter(key);
-          if (val != null) {
-            buf.append(val);
-          } else {
-            buf.append("");
-          }
+        } catch (Exception e) {
+          // FIXME Why is try/catch required?
+          e.printStackTrace();
         }
-      } catch (Exception e) {
-        // FIXME Why is try/catch required?
-        e.printStackTrace();
-      }
-      requestContent = buf.toString();
-    } else {
+        requestContent = buf.toString();
+      } else {
 
-      // retreive the byte array placed by TeeFilter
-      byte[] inputBuffer = (byte[]) httpRequest
-          .getAttribute(Constants.LB_INPUT_BUFFER);
+        // retreive the byte array placed by TeeFilter
+        byte[] inputBuffer = (byte[]) httpRequest
+            .getAttribute(Constants.LB_INPUT_BUFFER);
 
-      if (inputBuffer != null) {
-        requestContent = new String(inputBuffer);
-      }
+        if (inputBuffer != null) {
+          requestContent = new String(inputBuffer);
+        }
 
-      if (requestContent == null || requestContent.length() == 0) {
-        requestContent = EMPTY;
+        if (requestContent == null || requestContent.length() == 0) {
+          requestContent = EMPTY;
+        }
       }
     }
 
@@ -391,22 +387,23 @@
       return responseContent;
     }
 
-    if (Util.isImageResponse(httpResponse)) {
-      responseContent = "[IMAGE CONTENTS SUPPRESSED]";
-    } else {
+    if(httpResponse != null) {
+      if (Util.isImageResponse(httpResponse)) {
+        responseContent = "[IMAGE CONTENTS SUPPRESSED]";
+      } else {
 
-      // retreive the byte array previously placed by TeeFilter
-      byte[] outputBuffer = (byte[]) httpRequest
-          .getAttribute(Constants.LB_OUTPUT_BUFFER);
+        // retreive the byte array previously placed by TeeFilter
+        byte[] outputBuffer = (byte[]) httpRequest
+            .getAttribute(Constants.LB_OUTPUT_BUFFER);
 
-      if (outputBuffer != null) {
-        responseContent = new String(outputBuffer);
+        if (outputBuffer != null) {
+          responseContent = new String(outputBuffer);
+        }
+        if (responseContent == null || responseContent.length() == 0) {
+          responseContent = EMPTY;
+        }
       }
-      if (responseContent == null || responseContent.length() == 0) {
-        responseContent = EMPTY;
-      }
     }
-
     return responseContent;
   }