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Code to integrate GWT and Spring Security

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package com.github.apetrelli.gwtintegration.spring.security;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.security.access.AccessDeniedException;

import com.google.web.bindery.requestfactory.server.ExceptionHandler;
import com.google.web.bindery.requestfactory.shared.ServerFailure;

/**
 * Extension of ExceptionHandler.
 * Handles an exception produced while processing a request.
 *
 */
public class SpringSecurityLoggingExceptionHandler implements ExceptionHandler {

	private Logger log = LoggerFactory.getLogger(getClass());

	@Override
	public ServerFailure createServerFailure(Throwable throwable) {
		if (throwable != null) {
			String type = null;
			String message = "A server error occurred";
			if (throwable instanceof AccessDeniedException) {
				log.warn("Access denied, possible session expiration", throwable);
				type = "security";
				message = "Security error";
			}

			log.error("Server failure on request factory", throwable);
			// Writing the stack trace to the client is a bad idea, don't do it.
			return new ServerFailure(message, type, null, true);
		}
		log.error("Unrecognized server failure on request factory");
		return new ServerFailure("An unrecognized server error occurred", null, null, true);
	}

}