Servlet doPost being called twice

Hello all,
I have a servlet that is being called twice. The servlet is used to direct the user to the next jsp. I have 4 JSPs that the user steps through to add a record to a database. The 1st JSP lists the records that they have and asks them to add, edit or delete. The servlet gets call to direct them to the next JSP that they enter the data (or update) on. It then calls a verification JSP so the user can verify the information before submitting it. If everything is fine they submit the data. This verification JSP calls the servlet that adds or updates the record in the database. The servlet then directs the user to a confirmation page that tells the user if the submit was successful or not.
Here is how the flow is:
servlet -->menu.jsp -->servlet -->add.jsp -->verification.jsp -->servlet -->confirmation.jsp
Everything is fine until the verification.jsp submits to the servlet. That's where the doPost gets called twice.
I have put System.outs in the servlet code to see how many times the doPost gets called. It gets called once for every JSP except the verification JSP. When the user submits the data, the servlet's doPost gets called twice therefore it tries to add the record twice.
Has anyone had this problem before? How do I fix it?
Any help would be greatly appreciated!!
Tracey

Here is the output of the JSP that when submitted, calls the doPost twice:
<HTML>
<HEAD>
<META HTTP-EQUIV="Pragma" CONTENT="no-cache">
<TITLE>PreaPaid Legal Banner Verification</TITLE>
<script language="javascript">
function new_window(url){
link = window.open(url,"Link","toolbar=0,location=0,directories=0,status=0,menubar=1,scrollbars=1,resizable=1,width=650,height=450,left=50,top=50");
</script>
</HEAD>
<BODY>
<form name="myForm" action="/webapp/BannerTracker/BannerTrackingServlet" method="post">
<H3><font face="Arial">Banner Tracking Verification</font></H3>
<table BORDER=0 CELLSPACING=0 CELLPADDING=0 COLS=2 WIDTH=500><tr><td>
<font face="Arial" size=2>Below are the choices that you made for your image, size of the image and page to direct people to
when they click on your banner.
<br><br>If this is not what you would like, click the "Back" button to return to the Banner Selection page.
<br><br>You can click on the page link to view a sample of the age you have choosen.
</font></td></tr></table>
<P>
<font face="Arial" size=2>
<input type="hidden" name="cmd" value="doadd">
<input type="hidden" name="banname" value="yahoo">
<input type="hidden" name="banlogin" value="test">
<input type="hidden" name="banid" value="1">
<input type="hidden" name="bangname" value="difference">
<input type="hidden" name="bangsize" value="468x60">
<input type="hidden" name="banpage" value="go/test?:home">
<input type="hidden" name="session" value="PPL2P6LcONLiT45pSszZEb1GJ4HvRc5jQMDNPM8wCJ0rCZesD38oEZ4mC3KvCp8mDp00">
<input type="hidden" name="bangtype" value="gif">
<input type="hidden" name="banurl" value="<A HREF="http://www.prepaidlegal.com/go/test?banid=1&Assoc=test"><img src="http://www.prepaidlegal.com/html/buttonsdifference468x60.gif" border=0></A>">
<br><b>Banner name: </b>yahoo
<br><br><b>Page to be directed: </b>Your PPL Home Page
<br><br><b>Image selected: </b><img src=/html/buttons/difference468x60.gif >
<br><br><b>Copy the URL below to the banner source code.</b>
<br><br><img src="http://www.prepaidlegal.com/html/buttonsdifference468x60.gif " border=0>
</font>
<br><br>
<a><img src="/html/buttons/track_back.gif" border=0 onClick="window.history.back();"></a>
<input type=image src="/html/buttons/track_continue.gif" border=0 onClick="javascript:document.myForm.submit();">
</form>
</BODY>
</HTML>
Here is the doPost code from my servlet:
public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException
System.out.println("doPost called");
String next = "";
try
Command cmd = lookupCommand(req.getParameter("cmd"));
next = cmd.execute(req);
} catch (CommandException ce) {
req.setAttribute("javax.servlet.jsp.jspException", ce);
next = error;
} catch (SQLException se) {
req.setAttribute("javax.servlet.jsp.jspException", se);
next = error;
HttpSession mysession = req.getSession(true);
String session = String.valueOf(mysession.getAttribute("storedSession"));
if (session.equalsIgnoreCase("null"))
session = req.getParameter("session");
try
checkSession(session);
} catch (IOException ioe) {
System.err.println("Session exception: " + ioe.getMessage() + ".");
next = expire;
} else {
try
checkSession(session);
} catch (IOException ioe) {
System.err.println("Session exception: " + ioe.getMessage() + ".");
next = expire;
if ( session != null )
mysession.setAttribute("storedSession", session);
RequestDispatcher rd;
rd = getServletContext().getRequestDispatcher(jspdir + next);
rd.forward(req, res);
</code>
I hope this helps.
Tracey

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File inputParams = new File(inputDir + "/" + inputFileName + ".properties");
File inputTxt = new File(inputDir + "/" + inputFileName + ".txt");
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CommonProperties singleSerProps = new CommonProperties(inputParams);
Properties searchProps = new Properties();
searchProps.setProperty("search_from_date", srchStartDate);
searchProps.setProperty("search_to_date", srchEndDate);
searchProps.setProperty("force_zip_search", srchInZipFile);
if ((SearchProperties.saveSingeSearchProps(singleSerProps, searchProps)) && (SearchProperties.saveSearchFile(inputTxt, SearchString)))
if (mTUtils.genarateScript(auditEnable, debugEnable, errorEnable, srchInZipFile, inputFileName))
if (mTUtils.runScript("sh", inputFileName))
List tRecords = null;
TrackingLogReader treader = new TrackingLogReader();
try
tRecords = treader.getRecords(new File(resultsDir), inputFileName);
catch (Exception e)
e.printStackTrace();
if (tRecords == null)
tRecords = new ArrayList();
tRecords.add("No Records Found");
String backEnb = "";
String nextEnb = "";
int fromRec = 0;
int toRec = 0;
if (tRecords.size() > noOFrecordsPerPage)
toRec = noOFrecordsPerPage;
backEnb = "false";
nextEnb = "true";
else
toRec = tRecords.size();
backEnb = "false";
nextEnb = "false";
List subList = tRecords.subList(fromRec, toRec);
session.setAttribute("CompleteSearchRecords", tRecords);
session.setAttribute("DisplaySearchRecords", subList);
session.setAttribute("fromRec", new Integer(fromRec));
session.setAttribute("toRec", new Integer(toRec));
session.setAttribute("nextEnb", nextEnb);
session.setAttribute("backEnb", backEnb);
session.setAttribute("recsPerPage", new Integer(noOFrecordsPerPage));
res.sendRedirect("./../pages/SearchResults.jsp");
else {
res.sendRedirect("./../pages/error.jsp?userAuthDispMsg=Problem in calling PERL system , Please contact admin");
else
res.sendRedirect("./../pages/error.jsp?userAuthDispMsg=Script not generated , Please contact admin");
else
res.sendRedirect("./../pages/error.jsp?userAuthDispMsg=Search input directory not found, Please contact admin ");
//inputParams.delete();
//inputTxt.delete();
else if (pageId.equals("searchresults"))
noOFrecordsPerPage = ((Integer)session.getAttribute("recsPerPage")).intValue();
if (actionId.equals("newSearch"))
session.removeAttribute("CompleteSearchRecords");
session.removeAttribute("DisplaySearchRecords");
session.removeAttribute("fromRec");
session.removeAttribute("toRec");
session.removeAttribute("recsPerPage");
System.gc();
res.sendRedirect("./../pages/search.jsp");
else if (actionId.equals("first"))
List completeRecords = (List)session.getAttribute("CompleteSearchRecords");
int fromRec = 0;
int toRec = 0;
String backEnb = "";
String nextEnb = "";
if (completeRecords.size() > noOFrecordsPerPage)
toRec = noOFrecordsPerPage;
backEnb = "false";
nextEnb = "true";
else
toRec = completeRecords.size();
backEnb = "false";
nextEnb = "false";
List subList = completeRecords.subList(fromRec, toRec);
session.setAttribute("CompleteSearchRecords", completeRecords);
session.setAttribute("DisplaySearchRecords", subList);
session.setAttribute("fromRec", new Integer(fromRec));
session.setAttribute("toRec", new Integer(toRec));
session.setAttribute("nextEnb", nextEnb);
session.setAttribute("backEnb", backEnb);
session.setAttribute("recsPerPage", new Integer(noOFrecordsPerPage));
res.sendRedirect("./../pages/SearchResults.jsp");
else if (actionId.equals("last"))
List completeRecords = (List)session.getAttribute("CompleteSearchRecords");
int fromRec = 0;
int toRec = completeRecords.size();
String backEnb = "";
String nextEnb = "";
if (noOFrecordsPerPage > completeRecords.size())
fromRec = 0;
backEnb = "false";
nextEnb = "false";
else
fromRec = completeRecords.size() - noOFrecordsPerPage;
backEnb = "true";
nextEnb = "false";
List subList = completeRecords.subList(fromRec, toRec);
session.setAttribute("CompleteSearchRecords", completeRecords);
session.setAttribute("DisplaySearchRecords", subList);
session.setAttribute("fromRec", new Integer(fromRec));
session.setAttribute("toRec", new Integer(toRec));
session.setAttribute("nextEnb", nextEnb);
session.setAttribute("backEnb", backEnb);
session.setAttribute("recsPerPage", new Integer(noOFrecordsPerPage));
res.sendRedirect("./../pages/SearchResults.jsp");
else if (actionId.equals("back"))
List completeRecords = (List)session.getAttribute("CompleteSearchRecords");
int fromRec = ((Integer)session.getAttribute("fromRec")).intValue();
int toRec = ((Integer)session.getAttribute("toRec")).intValue();
toRec = fromRec;
if (fromRec - noOFrecordsPerPage > 0)
session.setAttribute("backEnb", "true");
fromRec -= noOFrecordsPerPage;
else
fromRec = 0;
session.setAttribute("backEnb", "false");
session.setAttribute("nextEnb", "true");
session.setAttribute("fromRec", new Integer(fromRec));
session.setAttribute("toRec", new Integer(toRec));
List subList = completeRecords.subList(fromRec, toRec);
session.setAttribute("DisplaySearchRecords", subList);
res.sendRedirect("./../pages/SearchResults.jsp");
else if (actionId.equals("next"))
List completeRecords = (List)session.getAttribute("CompleteSearchRecords");
int fromRec = ((Integer)session.getAttribute("fromRec")).intValue();
int toRec = ((Integer)session.getAttribute("toRec")).intValue();
fromRec = toRec;
if (toRec + noOFrecordsPerPage <= completeRecords.size())
session.setAttribute("nextEnb", "true");
toRec += noOFrecordsPerPage;
else
toRec = completeRecords.size();
session.setAttribute("nextEnb", "false");
session.setAttribute("backEnb", "true");
session.setAttribute("fromRec", new Integer(fromRec));
session.setAttribute("toRec", new Integer(toRec));
List subList = completeRecords.subList(fromRec, toRec);
session.setAttribute("DisplaySearchRecords", subList);
res.sendRedirect("./../pages/SearchResults.jsp");
else if (actionId.equals("download"))
String fileName = req.getParameter("fileName");
String originalFileName = req.getParameter("originalFileName");
doDownload(req, res, fileName, originalFileName);
else
res.sendRedirect("./../pages/login.jsp?userAuthDispMsg=Invalid USER");
public void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException
doGet(req, res);
private void doDownload(HttpServletRequest req, HttpServletResponse resp, String filename, String original_filename)
throws IOException
File f = new File(filename);
int length = 0;
ServletOutputStream op = resp.getOutputStream();
ServletContext context = getServletConfig().getServletContext();
String mimetype = context.getMimeType(filename);
resp.setContentType(mimetype != null ? mimetype : "application/octet-stream");
resp.setContentLength((int)f.length());
resp.setHeader("Content-Disposition", "attachment; filename=\"" + original_filename + "\"");
byte[] bbuf = new byte[10240];
DataInputStream in = new DataInputStream(new FileInputStream(f));
while ((in != null) && ((length = in.read(bbuf)) != -1))
op.write(bbuf, 0, length);
in.close();
op.flush();
op.close();
=========================
anyone please help me on above......Thanks in advance..

Hi jleech,
Thanks for the reply. But deleting all the temporary internet files as also the history files does not seem to have an effect. the doFilter is being called only at the second request. or did i miss anything??
Please help. unable to complete the assignment because of this.
Thank You,
Phani Kanuri

DoGet called twice on Tomcat Startup

Hi,
I have a problem with my Servlet doGet/doPost method being called twice (sometimes three times) on Tomcat 5 startup with J2SE 1.4 and Java SE 6. This problem happens on both, Firefox and Internet Explorer.
I only have one Servlet (called ServletFrontController) in my descriptor, since I decided to use the Front Controller Pattern. This Servlet extends from a "base Servlet" which has all the init configurations. My deployment descriptor looks like this (I also have mappings which I haven't included here):
    <servlet>
        <servlet-name>MainServlet</servlet-name>
        <servlet-class>com.myprogram.ServletFrontController</servlet-class>
        <init-param>
            <param-name>config</param-name>
            <param-value>application.properties</param-value>
        </init-param>
    </servlet>My doGet / doPost / doHead methods from the base Servlet just delegate to the ServletFrontController "main" method, like this:
public final void doGet(HttpServletRequest request, HttpServletResponse response) {
        try {
            process(request, response);
        } catch (Exception e) {
            handleException(e, request, response);
}Does anyone had this problem and know why this could happen?
Martin

All,
See post: [http://forum.java.sun.com/thread.jspa?threadID=720175|http://forum.java.sun.com/thread.jspa?threadID=720175]
Might help.
- JFK

Sprint -- Form being submitted twice, IE only.

Up front I'll state that this probably has nothing to do with Java, but I'll throw it out here just in case.
On a particular page, when we put 19 or more items into a list in a form, when we submit that form, the onSubmit method of our subclass of org.springframework.web.servlet.mvc.SimpleFormController is getting called twice.
This happens in IE, but not in Opera or Firefox.
Because of the browser-specific nature of this problem, I'm pretty sure it's not related to Java, but if anybody has seen something like this before or has an idea where to start looking, I'd be very appreciative.
This stuff was developed before my time, and I just started looking at it, so I'm not very familiar with it. It uses javascript, freemarker, and spring, none of which I'm familiar with. The only detail I've found for sure is that onSubmit is being called twice, and I'm a bit buggered as to where to look now.
Thanks,
Jeff

Do the forms get submitted by using a javascript call to form.submit()?
And is that javascript function called from an onclick event on an input type="submit"?
That can (and does) result in a double submit in IE.
It does not in firefox.
Heres a quick jsp page that demonstrates this:
<%! int count = 0; %>
<html>
<% System.out.println("Running..." + count++ + "Browser = " + request.getHeader("user-agent")); %>
<script>
function doStuff(button){
// submit via javascript
button.form.submit();
</script>
<form>
<input type="text" name="a1"/>
<input type="text" name="a2"/>
<input type="submit" onclick="doStuff(this)"/>
</form>
</html>This triggers two submits
- one for calling form.submit();
- one for pressing the submit button.
To fix - remove/cancel one of the submission events, any of the following should work:
- change the <input type="submit"> to an <input type="button">
- change the onclick event to be "doStuff(); return false": returning false from an onclick event handler cancels the event - in this case it would cancel form submission.
- remove the form.submit() javascript call
Cheers,
evanfets

Parsing code called twice

Somehow my code is being called twice with the result that everything has the same name twice (multiple names are legal according to the DTD).
My parsing code looks like this:
public Channel getChannel(Node channelnode)
Channel channel;
NodeList channelchildren;
Element channelelement;
channelelement = (Element)channelnode;
if(channelelement.hasAttribute("id"))
channel = new Channel(channelelement.getAttribute("id"));
channelchildren = channelnode.getChildNodes();
for(int i = 0 ; i < channelchildren.getLength() ; i++)
if(channelchildren.item(i).getNodeType() == Node.ELEMENT_NODE)
if(channelchildren.item(i).getNodeName().equals(("display-name")))
channel.addDisplayname(getDisplayname(channelchildren.item(i)));
if(channelchildren.item(i).getNodeName().equals(("icon")))
if(channelchildren.item(i).getNodeName().equals(("url")))
else
channel = null;
return channel;
public String getDisplayname(Node displaynamenode)
Element displaynameelement;
Node displayname;
displaynameelement = (Element)displaynamenode;
displayname = displaynamenode.getFirstChild();
if(displaynameelement.hasAttribute("lang"))
return displayname.getNodeValue();
else
return displayname.getNodeValue();
The code above is used to parse part of this tag in my XML file:
<channel id="001.tv.tv2.dk">
<display-name>TV 2</display-name>
<icon src="http://tv.tv2.dk/images/logo/1.gif" />
</channel>
The problem is that the addDisplayname in the Channel class is somehow called twice even though there is only one <display-name> tag.
Any help figuring out what is happening will be greatly appreciated.

I know about the second point you are making. The if-then-else statement is actually the start of further development since the <display-name> element can have a lang attribute and I have to deal with it, but for now I ignore it since it is extremely rarely used and other things are more important.
I had thought about the case that you mention with multiple calls of getChannel() but my debug output suggests that it is not the case. The method getChannel() returns a Channel object, which has a toString() method, and that object is given as argument to System.out.println() and never saved anywhere.
The toString() method of the Channel object looks like this:
public String toString()
String tmp = new String();
tmp += "display-name: " + displaynames.get(0);
for(String name : displaynames)
tmp += ", " + name;
return tmp;
With an output that look like this for the XML example given in my original post: display-name: TV 2, TV 2
With this output I don't see how multiple calls of getChannel() can be the cause, since multiple calls should give multiple Channel objects and multiple lines of output.

EJB 3.1 @Singleton with @Startup causes @PostConstruct to be called twice...

I have been working on initializing a some elements in the @PostConstruct annotated method within an EJB that is already annotated as @Singleton. I decided that I wanted the initialization to be done when the EJB is deployed so I added the @Startup. Both the constructor and @PostConstruct method is getting called twice. Can someone please explain to me why it appears the EJB is being initialized twice and if there is a way to prevent the @PostConstruct method from being called twice?
Many thanks,
- Joe

Is this with GlassFish?

EO Validation method called twice

Hi,
I have written an EO based field Validation method. But the problem is it is being called twice. First time ,it is validating correctly. But the second time it is not taking the field value and giving the error
I have included it like this in my jspx.
<af:inputText value="#{bindings.SubOrgName.inputValue}"
label="#{bindings.SubOrgName.label}"
required="#{bindings.SubOrgName.mandatory}"
columns="#{bindings.SubOrgName.displayWidth}"
binding="#{backing_Org.inputText3}"
id="inputText3"
rows="1">
<af:validator binding="#{bindings.SubOrgName.validator}"/>
</af:inputText>
Please help.

Thanks for sharing! ;-)

Servlet doPost being called twice

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