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Paul,
Please don't hijack threads. If you want to start a new thread, please
start a new email message addressed to this list; don't find an
existing message and reply to it.
- -chris
On 2/1/16 7:50 AM, Subhro Paul wrote:
> Hi Team,
>
> Our web application has a "header.jsp" which has 2 Arraylist on
> it. Each ArrayList has more than 50 items inside. The code is to
> identify the mobile device and requested page and transfer the call
> to mobile page accordingly.
>
> This code works fine once we restart the server and can continue
> running 2 months without any issue. But day by day it starts
> showing 500 error with exception in log
> "ConcurrentModificationException". Below is the code snippet of JSP
> code. My Question is why this issue is happening around 2 months?
> If we clear the temp file created by the server in work folder then
> that will run for some time( 2- 3 days) and then again the same
> exception starts occurring. I have identified one solution by
> moving the JAVA code from JSP to JAVA file which worked good while
> perform testing but client wants to know the root cause of the
> issue.
>
> FYI, earlier we had Vector in place of Arraylist which gave trouble
> of thread blocking due to synchronization. So, converting from
> Arraylist to Vector will not be a good idea.
>
>
> Exception:
>
> java.util.ConcurrentModificationException at
> java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859)
> at java.util.ArrayList$Itr.next(ArrayList.java:831) at
> org.apache.jsp.includes.header_jsp.isHomePage(header_jsp.java:97)
>
>
> Code Snippet:
>
> <%! private Set uas = new HashSet(); ArrayList<String> urlnames =
> new ArrayList<String>(); ArrayList<String> excludePathList = new
> ArrayList<String>();
>
> private boolean haveToRedirect(HttpServletRequest request, String
> stopMobiCookie) { boolean doRedirect = false;
>
> String userAgent = request.getHeader("User-Agent"); if (!
> stopMobiCookie.equals("yes") && userAgent != null &&
> userAgent.length()!=0 && (userAgent.indexOf("UsableNet")==-1)) {
>
> Iterator iter = uas.iterator(); while (iter.hasNext()) { if
> (userAgent.indexOf((String)iter.next())!=-1) { doRedirect = true;
> break;
>
>
> } } } return doRedirect; }
>
> private boolean isHomePage(HttpServletRequest request){
> Iterator<String> itr = urlnames.iterator(); String path = ""; while
> (itr.hasNext()) { path = itr.next(); if
> (request.getRequestURI().toString().equalsIgnoreCase(path)){ return
> true; } } return false; }
>
> private boolean isExcludePath(HttpServletRequest request){
> Iterator<String> itr = excludePathList.iterator(); String path =
> ""; while (itr.hasNext()) { path = itr.next(); if
> (request.getRequestURI().startsWith(path) &&
> !request.getRequestURI().startsWith("/info/contact.jsp")){ return
> true; } } return false; }
>
> %>
>
>
> <%
>
> uas.add("Blazer"); uas.add("Danger hiptop"); uas.add("DoCoMo/");
> uas.add("Ericsson"); uas.add("Googlebot-Mobile"); uas.add("MSN
> Mobile Proxy"); uas.add("Handheld"); uas.add("HTC_HD2_T58585
> Opera"); uas.add("iPhone"); uas.add("iPod"); uas.add("Klondike");
> uas.add("LG-"); uas.add("LGE-"); ....... Arround 40 items
>
>
> excludePathList.add("/business/my_account");
> excludePathList.add("/business/save_energy");
> excludePathList.add("/business/services");
> excludePathList.add("/business/small_large_business");
> excludePathList.add("/info/environment");
> excludePathList.add("/info/about");
> excludePathList.add("/info/index.jsp");
> excludePathList.add("/info/ambassador.jsp"); ........ more than 50
> items
>
>
> stopMobiCookie = some cookie code
>
> boolean doRedirect = haveToRedirect((HttpServletRequest)request,
> stopMobiCookie);
>
>
> if(doRedirect){ boolean isHomePage =
> isHomePage((HttpServletRequest)request); boolean isExcludePath =
> isExcludePath((HttpServletRequest)request);
>
> session.setAttribute("mobile_agent", "yes");
>
> if(!isHomePage && !isExcludePath){ String mobileServer =
> "mobile.server.com"; try{ mobileServer = mobileServer +
> request.getRequestURI().toString(); }catch(Exception e){} %>
> <script type="text/javascript"> window.location
> ="<%=mobileServer%>"; </script> <% } } %>
>
>
>
> Thanks & Regards Subhro Paul =====-----=====-----===== Notice: The
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>
>
>
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