Cannot call sendRedirect() after the response has been committed

Hi,

I am using Servlet 3 with JSP and jstl.

There is an error which I do not know how to resolve and I hope I can can help here.

The error message is

java.lang.IllegalStateException: Cannot call sendRedirect() after the response has been committed
at org.apache.catalina.connector.ResponseFacade.sendRedirect(ResponseFacade.java:488)
at Controller.UserItemsController.process(UserItemsController.java:263)
at Controller.UserItemsController.doGet(UserItemsController.java:54)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)


case "/update":
// first validate if the item is found
// then retrieve items from both tables

ScrtyItemMdle m4 = new ScrtyItemMdle();
Scrty m5 = new Scrty();
itemsMDLEDAO mif5 = EMSONDAOFactory.getItemsMDLEDAOInstance();

try {
// SCRTY_ITEM_MDLE
String SItemId = request.getParameter("ITEM_ID");// Num_Group
m4.setItemId(SItemId);
String Security_MDLE = request.getParameter("SECURITY MODULES");// Security
// Module
m4.setSecurity_Modules(Security_MDLE);
String SFunction = request.getParameter("FUNCTION");// Num_Access_Right
m4.setFunction(SFunction);
mif5.updateItems(m4);
response.sendRedirect(
response.encodeRedirectURL("http://localhost:8013/EMSONCRUD/listAll/DisplayAll"));
} catch (Exception e) { // TODO Auto-generated catch block
e.printStackTrace();
}