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    <p>Yes, there is. It's a bit complicated, but works well for us.</p> <p>Basically, we change the Filter chain for sessions. We do this for bots (Google, Pear, Yahoo).</p> <p>Create a new Filter and register it, then use this source for the Filter class:</p> <pre><code>public class BotFilter implements javax.servlet.Filter { private int inactive_seconds = 5*60; private String[] bots = new String[] { "googlebot", //google "msnbot", //msn "slurp", //yahoo "libcurl", //curl, sometimes used with bigbrother "bigbrother", //bigbrother availability check "whatsup", //whatsup availability check "surveybot", //unknown "wget", // nocomment "speedyspider", //http://www.entireweb.com/about/search_tech/speedyspider/ "nagios-plugins", //Alle Nagios-Abfragen "pear.php.net", //Irgendwelcher PHP-Scheiß "mj12bot", //http://www.majestic12.co.uk/projects/dsearch/mj12bot.php "bingbot", //M$ Bing "dotbot", //We are just a few Seattle based guys trying to figure out how to make internet data as open as possible. "aggregator:spinn3r", //http://spinn3r.com/robot "baiduspider" //http://www.baidu.com/search/spider.htm }; private HashMap&lt;String, HttpSession&gt; botsessions; public BotFilter() { this.botsessions = new HashMap&lt;String, HttpSession&gt;(); } public void init(FilterConfig config) throws ServletException { } public void doFilter(ServletRequest request, ServletResponse response, FilterChain next) throws IOException, ServletException { if (request instanceof HttpServletRequest) { HttpServletRequest httprequest = (HttpServletRequest) request; try { String useragent = ((HttpServletRequest) request).getHeader("User-Agent"); if (useragent == null) { ((HttpServletResponse) response).sendRedirect("http://www.google.com"); } useragent = useragent.toLowerCase(); if (httprequest.getSession(false) == null) { } for (int i = 0; i &lt; this.bots.length; i++) { if (useragent.indexOf(this.bots[i]) &gt; -1) { String key = httprequest.getRemoteAddr() + useragent; boolean SessionIsInvalid=false; synchronized(this.botsessions) { try { if(this.botsessions.get(key)!=null) this.botsessions.get(key).getAttributeNames(); } catch (java.lang.IllegalStateException ise) { SessionIsInvalid = true; } if(this.botsessions.get(key)==null||SessionIsInvalid) { httprequest.getSession().setMaxInactiveInterval(this.inactive_seconds); if(SessionIsInvalid) this.botsessions.remove(key); //Remove first, if in there this.botsessions.put(key, httprequest.getSession()); //Then add a little spice } else { next.doFilter(new BotFucker(httprequest, this.botsessions.get(key)), response); return; } } }; } } catch (Exception e) { //Error handling code } } next.doFilter(request, response); } public void destroy() { } } </code></pre> <p>And this little one for the redirection class:</p> <pre><code>public class BotFucker extends HttpServletRequestWrapper { HttpSession session; public BotFucker(HttpServletRequest request, HttpSession session) { super(request); this.session = session; } @Override public HttpSession getSession(boolean create) { return this.session; } @Override public HttpSession getSession() { return this.session; } } </code></pre> <p>These two classes re-use the sessions that the bots had before, if they connect again using the same IP within a given time limit. We're not 100% sure what this does to the data that the bot receives, but as this code is running for many months now and solved our problem (multiple connects/sessions per second per IP from Google).</p> <p>And before somebody tries to help: The problem has been submitted multiple times to Google via Webmaster interface. The crawling interval has been lowered to the lowest possible setting, and the problem spawned a 3x reply thread on the appropriate forum without any hint as to why this problem exists.</p>
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