ConcurrentModificationException using s:iterator (intermittent)
---------------------------------------------------------------
Key: WW-3019
URL: https://issues.apache.org/struts/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
Attachments: layout_wait.jsp, struts.xml, tiles.xml
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):
<%@ 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>
This is the layout page I am including the above file in (waitlayout.jsp):
<%@ 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>${application.title}</title>
<style type="text/css">@import url( css/empe.css );</style>
</head>
<body>
<div class="force-scrollbar"> </div>
<div class="main">
<div class="content">
<tiles:insertAttribute name="body" />
<tiles:insertAttribute name="viewRequest" />
</div>
</div>
</body>
</html>
This sometimes crashses with the following stack trace:
Caused by: java.util.ConcurrentModificationException
at
java.util.AbstractList$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
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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