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https://issues.apache.org/jira/browse/WW-3019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13966424#comment-13966424
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Lukasz Lenart commented on WW-3019:
-----------------------------------
I don't think framework can do anything about that - use concurrent aware
implementation of {{List}} or {{Map}} instead of simple {{ArrayList}} or
{{HashMap}}
> ConcurrentModificationException using s:iterator (intermittent)
> ---------------------------------------------------------------
>
> Key: WW-3019
> URL: https://issues.apache.org/jira/browse/WW-3019
> Project: Struts 2
> Issue Type: Bug
> Affects Versions: 2.1.6
> Environment: OS:
> Linux 2.6.18-92.1.13.el5 #1 SMP Wed Sep 24 19:33:52 EDT 2008 i686 i686 i386
> GNU/Linux
> Glassfish:
> Version = Sun Java System Application Server 9.1_02
> Reporter: Chris Dunphy
> Fix For: 2.5.x
>
> Attachments: layout_wait.jsp, struts.xml, tiles.xml, viewrequest.jsp,
> wait.jsp
>
>
> I have an intermittent problem using the s:iterator tag with the waitAndExec
> interceptor. Here is the file that I am trying to insert into the tiles
> layout (viewrequest.jsp):
> {code:xml}
> <%@ taglib prefix="s" uri="/struts-tags"%>
> <s:if test="empeRequest.messages.size() > 0">
> <div class="box" style="background-color: #CCCCCC">
> <h3><s:property value="empeRequest.description" /></h3>
> <ul>
> <s:iterator value="empeRequest.messages">
> <s:if test="status.toString() == 'NORMAL'">
> <li style="background-color:
> #CCFFCC"><s:property
> value="message" /></li>
> </s:if>
> <s:elseif test="status.toString() == 'WARNING'">
> <li style="background-color:
> #FFFFCC"><s:property
> value="message" /></li>
> </s:elseif>
> <s:elseif test="status.toString() == 'ERROR'">
> <li style="background-color:
> #FFBBBB"><s:property
> value="message" /></li>
> </s:elseif>
> </s:iterator>
> </ul>
> </div>
> </s:if>
> {code}
> This is the layout page I am including the above file in (waitlayout.jsp):
> {code:xml}
> <%@ taglib uri="http://tiles.apache.org/tags-tiles"; prefix="tiles"%>
> <%@ taglib prefix="s" uri="/struts-tags"%>
> <?xml version="1.0" encoding="utf-8"?>
> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
> "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";>
> <html xmlns="http://www.w3.org/1999/xhtml"; xml:lang="en">
> <head>
> <meta http-equiv="refresh" content="5;url=<s:url
> includeParams="all" />" />
> <title>${application.title}</title>
> <style type="text/css">@import url( css/empe.css );</style>
> </head>
> <body>
> <div class="force-scrollbar"> </div>
> <div class="main">
> <div class="content">
> <tiles:insertAttribute name="body" />
> <tiles:insertAttribute name="viewRequest" />
> </div>
> </div>
> </body>
> </html>
> {code}
> This sometimes crashses with the following stack trace:
> {noformat}
> Caused by: java.util.ConcurrentModificationException
> at
> java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
> at java.util.AbstractList$Itr.next(AbstractList.java:343)
> at
> org.apache.struts2.components.IteratorComponent.end(IteratorComponent.java:266)
> at
> org.apache.struts2.views.jsp.IteratorTag.doAfterBody(IteratorTag.java:69)
> at
> org.apache.jsp.jsp.fragments.viewrequest_jsp._jspx_meth_s_iterator_0(viewrequest_jsp.java
> from :177)
> at
> org.apache.jsp.jsp.fragments.viewrequest_jsp._jspx_meth_s_if_0(viewrequest_jsp.java
> from :108)
> at
> org.apache.jsp.jsp.fragments.viewrequest_jsp._jspService(viewrequest_jsp.java
> from :67)
> at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:93)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
> at
> org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
> at
> org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:470)
> at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:364)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
> at
> org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:411)
> at
> org.apache.catalina.core.ApplicationDispatcher.doInvoke(ApplicationDispatcher.java:855)
> at
> org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:703)
> at
> org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:660)
> at
> org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:578)
> at
> org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:997)
> at
> org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:682)
> at
> org.apache.tiles.jsp.context.JspTilesRequestContext.include(JspTilesRequestContext.java:103)
> ... 112 more
> {noformat}
> This doesn't happen consistently, but every third or forth run, which is
> enough to cause problems for users. I don't suspect it is a tiles issue, but
> appears to be an issue with iterator based on the stack trace.
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