JSP页面加载时自动执行action

我想在JSP页面加载时自动执行action，把数据库中的新闻列表加载出来。我用了ready()函数，form_all_news是form id，代码如下：
<script>$(document).ready(function(){
$("#form_all_news").submit();
})</script>…………<form action="Search_all_news" methed="post"name="form1" id="form_all_news">
    <table class="tablelist" width="700" border="1" align="center" style="position:absolute; left:360px; top:300px; background:">
     <thead>
     <tr>
        <th>编号</th>
        <th>标题</th>
        <th>内容</th>
        <th>发布时间</th>    
        </tr>
          <% 
         ResultSet rs=(ResultSet)session.getAttribute("allnews");
         try
         {
         while(rs.next())
         {
         out.println("<tr>");
         out.println("<td><input name='' type='checkbox' value='' checked='checked'/></td>");
         out.println("<td>");
         out.println(rs.getString(1));
         out.println("</td>");
         out.println("<td>");
         out.println(rs.getString(2));
         out.println("</td>");
         out.println("<td>");
         out.println(rs.getString(3));
         out.println("</td>");
         out.println("<td>");
         out.println(rs.getString(4));
         out.println("</td>");
         out.println("</tr>");
         }
         }
         catch(Exception e)
         {
         e.printStackTrace();
         } 
        %>
        </thead>
   </table>
    </form>每次进入到这个页面就会报错：java.lang.NullPointerException
at org.apache.jsp.news_jsp._jspService(news_jsp.java:216)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:438)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2527)
at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2516)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
求大神指点，谢谢！