Я полусил эту ошибку, а следом (в другом окне) получил предложение ввести ID и пароль.
500 Servlet Exception
java.lang.Error: Error
at forum.FDLServlet.service(FDLServlet.java:113)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:103)
at com.caucho.server.http.FilterChainServlet.doFilter(FilterChainServlet.java:96)
at dl2.webfilter.TimeLoad.doFilter(TimeLoad.java:55)
at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
at dl2.webfilter.CheckerBan.doFilter(CheckerBan.java:134)
at com.caucho.server.http.FilterChainFilter.doFilter(FilterChainFilter.java:88)
at com.caucho.server.http.Invocation.service(Invocation.java:315)
at com.caucho.server.http.CacheInvocation.service(CacheInvocation.java:135)
at com.caucho.server.http.RunnerRequest.handleRequest(RunnerRequest.java:344)
at com.caucho.server.http.RunnerRequest.handleConnection(RunnerRequest.java:274)
at com.caucho.server.TcpConnection.run(TcpConnection.java:139)
at java.lang.Thread.run(Thread.java:536)