diff --git a/core/src/main/java/org/acegisecurity/context/HttpSessionContextIntegrationFilter.java b/core/src/main/java/org/acegisecurity/context/HttpSessionContextIntegrationFilter.java
index 47e8be66e3..d1767856bb 100644
--- a/core/src/main/java/org/acegisecurity/context/HttpSessionContextIntegrationFilter.java
+++ b/core/src/main/java/org/acegisecurity/context/HttpSessionContextIntegrationFilter.java
@@ -12,6 +12,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package net.sf.acegisecurity.context;
 
 import org.apache.commons.logging.Log;
@@ -36,7 +37,7 @@ import javax.servlet.http.HttpSession;
  * Populates the <code>SecurityContextHolder</code> with information obtained
  * from the <code>HttpSession</code>.
  * </p>
- *
+ * 
  * <p>
  * The <code>HttpSession</code> will be queried to retrieve the
  * <code>SecurityContext</code> that should be stored against the
@@ -45,7 +46,7 @@ import javax.servlet.http.HttpSession;
  * <code>SecurityContextHolder</code> will be persisted back to the
  * <code>HttpSession</code> by this filter.
  * </p>
- *
+ * 
  * <p>
  * If a valid <code>SecurityContext</code> cannot be obtained from the
  * <code>HttpSession</code> for whatever reason, a fresh
@@ -54,7 +55,7 @@ import javax.servlet.http.HttpSession;
  * method (which defaults to {@link
  * net.sf.acegisecurity.context.SecurityContextImpl}.
  * </p>
- *
+ * 
  * <p>
  * No <code>HttpSession</code> will be created by this filter if one does not
  * already exist. If at the end of the web request the
@@ -66,12 +67,12 @@ import javax.servlet.http.HttpSession;
  * <code>HttpSession</code> creation, but automates the storage of changes
  * made to the <code>ContextHolder</code>.
  * </p>
- *
+ * 
  * <P>
  * This filter will only execute once per request, to resolve servlet container
  * (specifically Weblogic) incompatibilities.
  * </p>
- *
+ * 
  * <p>
  * If for whatever reason no <code>HttpSession</code> should <b>ever</b> be
  * created (eg this filter is only being used with Basic authentication or
@@ -82,7 +83,7 @@ import javax.servlet.http.HttpSession;
  * designed to have no persistence of the <code>Context</code> between web
  * requests.
  * </p>
- *
+ * 
  * <p>
  * This filter MUST be executed BEFORE any authentication procesing mechanisms.
  * Authentication processing mechanisms (eg BASIC, CAS processing filters etc)
@@ -96,9 +97,14 @@ import javax.servlet.http.HttpSession;
  */
 public class HttpSessionContextIntegrationFilter implements InitializingBean,
     Filter {
+    //~ Static fields/initializers =============================================
+
     protected static final Log logger = LogFactory.getLog(HttpSessionContextIntegrationFilter.class);
     private static final String FILTER_APPLIED = "__acegi_session_integration_filter_applied";
     public static final String ACEGI_SECURITY_CONTEXT_KEY = "ACEGI_SECURITY_CONTEXT";
+
+    //~ Instance fields ========================================================
+
     private Class context = SecurityContextImpl.class;
     private Object contextObject;
 
@@ -109,6 +115,8 @@ public class HttpSessionContextIntegrationFilter implements InitializingBean,
      */
     private boolean allowSessionCreation = true;
 
+    //~ Methods ================================================================
+
     public void setAllowSessionCreation(boolean allowSessionCreation) {
         this.allowSessionCreation = allowSessionCreation;
     }
@@ -126,10 +134,11 @@ public class HttpSessionContextIntegrationFilter implements InitializingBean,
     }
 
     public void afterPropertiesSet() throws Exception {
-        if ((this.context == null) ||
-                (!SecurityContext.class.isAssignableFrom(this.context))) {
+        if ((this.context == null)
+            || (!SecurityContext.class.isAssignableFrom(this.context))) {
             throw new IllegalArgumentException(
-                "context must be defined and implement SecurityContext (typically use net.sf.acegisecurity.context.SecurityContextImpl)");
+                "context must be defined and implement SecurityContext (typically use net.sf.acegisecurity.context.SecurityContextImpl; existing class is "
+                + this.context + ")");
         }
 
         this.contextObject = generateNewContext();
@@ -138,13 +147,11 @@ public class HttpSessionContextIntegrationFilter implements InitializingBean,
     /**
      * Does nothing. We use IoC container lifecycle services instead.
      */
-    public void destroy() {
-    }
+    public void destroy() {}
 
     public void doFilter(ServletRequest request, ServletResponse response,
         FilterChain chain) throws IOException, ServletException {
-        if ((request != null) &&
-                (request.getAttribute(FILTER_APPLIED) != null)) {
+        if ((request != null) && (request.getAttribute(FILTER_APPLIED) != null)) {
             // ensure that filter is only applied once per request
             chain.doFilter(request, response);
         } else {
@@ -157,8 +164,7 @@ public class HttpSessionContextIntegrationFilter implements InitializingBean,
 
             try {
                 httpSession = ((HttpServletRequest) request).getSession(false);
-            } catch (IllegalStateException ignored) {
-            }
+            } catch (IllegalStateException ignored) {}
 
             if (httpSession != null) {
                 httpSessionExistedAtStartOfRequest = true;
@@ -169,17 +175,17 @@ public class HttpSessionContextIntegrationFilter implements InitializingBean,
                     if (contextFromSessionObject instanceof SecurityContext) {
                         if (logger.isDebugEnabled()) {
                             logger.debug(
-                                "Obtained from ACEGI_SECURITY_CONTEXT a valid SecurityContext and set to SecurityContextHolder: '" +
-                                contextFromSessionObject + "'");
+                                "Obtained from ACEGI_SECURITY_CONTEXT a valid SecurityContext and set to SecurityContextHolder: '"
+                                + contextFromSessionObject + "'");
                         }
 
                         SecurityContextHolder.setContext((SecurityContext) contextFromSessionObject);
                     } else {
                         if (logger.isWarnEnabled()) {
                             logger.warn(
-                                "ACEGI_SECURITY_CONTEXT did not contain a SecurityContext but contained: '" +
-                                contextFromSessionObject +
-                                "'; are you improperly modifying the HttpSession directly (you should always use SecurityContextHolder) or using the HttpSession attribute reserved for this class? - new SecurityContext instance associated with SecurityContextHolder");
+                                "ACEGI_SECURITY_CONTEXT did not contain a SecurityContext but contained: '"
+                                + contextFromSessionObject
+                                + "'; are you improperly modifying the HttpSession directly (you should always use SecurityContextHolder) or using the HttpSession attribute reserved for this class? - new SecurityContext instance associated with SecurityContextHolder");
                         }
 
                         SecurityContextHolder.setContext(generateNewContext());
@@ -221,11 +227,9 @@ public class HttpSessionContextIntegrationFilter implements InitializingBean,
                 // Store context back to HttpSession
                 try {
                     httpSession = ((HttpServletRequest) request).getSession(false);
-                } catch (IllegalStateException ignored) {
-                }
+                } catch (IllegalStateException ignored) {}
 
-                if ((httpSession == null) &&
-                        httpSessionExistedAtStartOfRequest) {
+                if ((httpSession == null) && httpSessionExistedAtStartOfRequest) {
                     if (logger.isDebugEnabled()) {
                         logger.debug(
                             "HttpSession is now null, but was not null at start of request; session was invalidated, so do not create a new session");
@@ -233,44 +237,44 @@ public class HttpSessionContextIntegrationFilter implements InitializingBean,
                 }
 
                 // Generate a HttpSession only if we need to
-                if ((httpSession == null) &&
-                        !httpSessionExistedAtStartOfRequest) {
+                if ((httpSession == null)
+                    && !httpSessionExistedAtStartOfRequest) {
                     if (!allowSessionCreation) {
                         if (logger.isDebugEnabled()) {
                             logger.debug(
                                 "The HttpSession is currently null, and the HttpSessionContextIntegrationFilter is prohibited from creating a HttpSession (because the allowSessionCreation property is false) - SecurityContext thus not stored for next request");
                         }
                     } else if (!contextObject.equals(
-                                SecurityContextHolder.getContext())) {
+                            SecurityContextHolder.getContext())) {
                         if (logger.isDebugEnabled()) {
                             logger.debug(
                                 "HttpSession being created as SecurityContextHolder contents are non-default");
                         }
 
                         try {
-                            httpSession = ((HttpServletRequest) request).getSession(true);
-                        } catch (IllegalStateException ignored) {
-                        }
+                            httpSession = ((HttpServletRequest) request)
+                                .getSession(true);
+                        } catch (IllegalStateException ignored) {}
                     } else {
                         if (logger.isDebugEnabled()) {
                             logger.debug(
-                                "HttpSession is null, but SecurityContextHolder has not changed from default: ' " +
-                                SecurityContextHolder.getContext() +
-                                "'; not creating HttpSession or storing SecurityContextHolder contents");
+                                "HttpSession is null, but SecurityContextHolder has not changed from default: ' "
+                                + SecurityContextHolder.getContext()
+                                + "'; not creating HttpSession or storing SecurityContextHolder contents");
                         }
                     }
                 }
 
                 // If HttpSession exists, store current SecurityContextHolder contents
                 // but only if SecurityContext has actually changed (see JIRA SEC-37)
-                if ((httpSession != null) &&
-                        (SecurityContextHolder.getContext().hashCode() != contextWhenChainProceeded)) {
+                if ((httpSession != null)
+                    && (SecurityContextHolder.getContext().hashCode() != contextWhenChainProceeded)) {
                     httpSession.setAttribute(ACEGI_SECURITY_CONTEXT_KEY,
                         SecurityContextHolder.getContext());
 
                     if (logger.isDebugEnabled()) {
-                        logger.debug("SecurityContext stored to HttpSession: '" +
-                            SecurityContextHolder.getContext() + "'");
+                        logger.debug("SecurityContext stored to HttpSession: '"
+                            + SecurityContextHolder.getContext() + "'");
                     }
                 }
 
@@ -302,6 +306,5 @@ public class HttpSessionContextIntegrationFilter implements InitializingBean,
      *
      * @throws ServletException ignored
      */
-    public void init(FilterConfig filterConfig) throws ServletException {
-    }
+    public void init(FilterConfig filterConfig) throws ServletException {}
 }