java.lang.NoSuchMethodError: javax.servlet.http.Cookie.isHttpOnly()Z

I'm using SmartGWT 4.1-p20140316 and getting java.lang.NoSuchMethodError: javax.servlet.http.Cookie.isHttpOnly()Z.

This happens as soon as I load my SmartGWT application.

Here's the full call stack:

java.lang.NoSuchMethodError: javax.servlet.http.Cookie.isHttpOnly()Z
at org.eclipse.jetty.server.Response.addCookie(Respon se.java:162)
at com.isomorphic.servlet.ServletTools.setCookie(Serv letTools.java:542)
at com.isomorphic.servlet.ServletTools.setCookie(Serv letTools.java:527)
at com.isomorphic.servlet.ServletTools.setCompression ReadyCookie(ServletTools.java:982)
at com.isomorphic.compression.ServletCompression.comp ressAndSend(ServletCompression.java:154)
at com.isomorphic.servlet.CompressionFilter.doFilter( CompressionFilter.java:387)
at org.eclipse.jetty.servlet.ServletHandler$CachedCha in.doFilter(ServletHandler.java:1474)
at org.eclipse.jetty.servlet.ServletHandler.doHandle( ServletHandler.java:499)
at org.eclipse.jetty.server.handler.ScopedHandler.han dle(ScopedHandler.java:137)
at org.eclipse.jetty.security.SecurityHandler.handle( SecurityHandler.java:557)
at org.eclipse.jetty.server.session.SessionHandler.do Handle(SessionHandler.java:231)
at org.eclipse.jetty.server.handler.ContextHandler.do Handle(ContextHandler.java:1086)
at org.eclipse.jetty.servlet.ServletHandler.doScope(S ervletHandler.java:428)
at org.eclipse.jetty.server.session.SessionHandler.do Scope(SessionHandler.java:193)
at org.eclipse.jetty.server.handler.ContextHandler.do Scope(ContextHandler.java:1020)
at org.eclipse.jetty.server.handler.ScopedHandler.han dle(ScopedHandler.java:135)
at org.eclipse.jetty.server.handler.HandlerWrapper.ha ndle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.handler.RequestLogHandler .handle(RequestLogHandler.java:68)
at org.eclipse.jetty.server.handler.HandlerWrapper.ha ndle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java :370)
at org.eclipse.jetty.server.AbstractHttpConnection.ha ndleRequest(AbstractHttpConnection.java:489)
at org.eclipse.jetty.server.AbstractHttpConnection.he aderComplete(AbstractHttpConnection.java:949)
at org.eclipse.jetty.server.AbstractHttpConnection$Re questHandler.headerComplete(AbstractHttpConnection .java:1011)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpPa rser.java:644)
at org.eclipse.jetty.http.HttpParser.parseAvailable(H ttpParser.java:235)
at org.eclipse.jetty.server.AsyncHttpConnection.handl e(AsyncHttpConnection.java:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.han dle(SelectChannelEndPoint.java:668)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.r un(SelectChannelEndPoint.java:52)
at org.eclipse.jetty.util.thread.QueuedThreadPool.run Job(QueuedThreadPool.java:608)
at org.eclipse.jetty.util.thread.QueuedThreadPool$3.r un(QueuedThreadPool.java:543)
at java.lang.Thread.run(Thread.java:744)