CallServer JSP timeout

TS 7.2.1

Hi

We have a callserver in a DCT item which hits a JSP page.This JSP is used to instantiate a java class to do some DB operation. The response time varies depending upon the DB rows retrieved. The alerts given after java function call are not working if the response time is more. The process bar shows 'Done' even before the server side execution is over.Java code executes fully but the JSP alerts are lost. How can we handle this? Please provide your comments.

JSP:
[html]
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>

<%@page import="com.gen.DBDataUpdate"%>
<%@page import="com.interwoven.cssdk.common.CSClient"%>
<%@page import="org.apache.log4j.Logger"%>

<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
DB Update
<%@ taglib uri="/WEB-INF/tlds/context.tld" prefix="context" %>
<%!String itemName; %>

createIfNeeded="true"
contextClass="com.interwoven.ui.teamsite.auth.CSClientContext"/>

<%
Logger logger = Logger.getLogger("com.gen.DBDataUpdate");
logger.info("Gen.jsp Call Initiated");
CSClient client = null;
String query = request.getParameter("queryName");
client = user_context.getCSClient();
if(DBDataUpdate.getIsSuccessFull()==0 ){
DBDataUpdate g= new DBDataUpdate(query,client);
g.populateItems(); //This function may take more time depending upon db resultset
if(DBDataUpdate.getIsSuccessFull()==1){
out.println("<script language=\"JavaScript\">");
out.println("alert(\"Completed without errors. Please check the log file for warnings.\");");
out.println("</script>");
}else {
out.println("<script language=\"JavaScript\">");
out.println("alert(\"Exception occurred. Check Log file for errors.\");");
out.println("</script>");
}g=null;
}else{
out.println("<script language=\"JavaScript\">");
out.println("alert(\"Update is already running. Please wait.\");");
out.println("</script>");
}
logger.info("Gen.jsp Finished Executing");
%>

[/html]

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Comments

Rick Poulin

If your JSP takes more than 20 seconds to load, I'd strongly recommend changing your process to an asynchronous one. That means that the initial call would trigger the Java process in a separate thread, and return immediately. You could keep a marker to that thread in the user's session, and have callserver ask the server "are you done yet?" or "what's your progress?" every X seconds.

The reason your response is being cut off is that most (if not all) HTTP clients including your browser have timeouts specifically to tell the user that a page or server doesn't appear to be responding. There's various workarounds for this on the server side, all of which are so ridiculously ugly that I won't bother suggesting them. The browser/HTTP-friendly solution is the above.

Jeya

Changed the call to Ajax request.Its working fine.


xmlhttp.onreadystatechange  =function(){if(xmlhttp.readyState == 4) {
      alert(xmlhttp.responseText);

However once I got a Server down alert instead of JSP response alert(Code executed fully and Jboss was not down). I have attached the alert image. I am not able to replicate the same alert after that. Any idea why this happened?

Rick Poulin

Any idea why this happened?

By using an AJAX request, you're simply extending the timeout length and not actually addressing the problem. Instead of timing out on the client side, the iwwebd timed out while waiting for a response from JBoss.

ISCBorisB

By using an AJAX request, you're simply extending the timeout length and not actually addressing the problem. Instead of timing out on the client side, the iwwebd timed out while waiting for a response from JBoss.

Btw, if timeouts are still defaults and all - that processing is taking more than five minutes

Jeya

I'd strongly recommend changing your process to an asynchronous one. That means that the initial call would trigger the Java process in a separate thread, and return immediately.
You could keep a marker to that thread in the user's session, and have callserver ask the server "are you done yet?" or "what's your progress?" every X seconds.

In FormPub API how to set a listener to a thread and ask the server's process status? I see only timeout functions with callserver(). Please provide some pointers to achieve this.

Rick Poulin

Use callserver() in conjunction with setTimeout(). As an example, your callserver should call a URL like /iw-cc/your-org/my.jsp?action=getstatus. That URL could produce javascript to call a function like showStatus(JSON object with properties done=false and progress=0.63 ). Your showStatus would do whatever it needs to do with that and, if done=false, use setTimeout() to schedule another callserver X seconds later.