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From "David Tam" <david....@hk.dbsvickers.com>
Subject ConcurrentModificationException
Date Mon, 02 Sep 2002 08:09:40 GMT
i am using Struts 1.1b2 with tiles on BES 5.0.2(tomcat 4.0.1).  i ve got the
following form:


public final class fw_MenuItemAdminForm extends ActionForm {

    private List parmsAL = new FastArrayList();
    private Collection parms = col1.lazyList(parmsAL, fw_MenuItemParmVO.class);

    public void addParm(fw_MenuItemParmVO theParm){
        parms.add(theParm);
    }

    public Collection getParms(){
        return parms;
    }

}

and here is my jsp:

    <table>
    <tr>
    <td><bean:message key="menuItemAdminForm.parmKey"/>:</td>
    <td><bean:message key="menuItemAdminForm.parmVal"/>:</td>
    </tr>
    <nested:iterate id="menuItemParms" property="parms"
type="fw_MenuItemParmVO">
    <tr>
     <td><nested:write property="parmKey" /><nested:hidden property="parmKey"
/></td>
     <td><nested:write property="parmVal" /><nested:hidden property="parmVal"
/></td>
    </tr>
    </nested:iterate>

    </table>



when my dispatch action class is being called the following method is being
executed:

    public ActionForward addParm(ActionMapping mapping,
                                    ActionForm form,
                                    HttpServletRequest request,
                                    HttpServletResponse response) throws
Exception{

        fw_MenuItemAdminForm miaForm = (fw_MenuItemAdminForm)form;

        logger.debug("addParm:: miaForm.getParms().size() = " +
miaForm.getParms().size());

        miaForm.addParm(new fw_MenuItemParmVO(null, null, false));

        return (mapping.findForward("success"));

    }




the link to the "success" forward is ok(can tell from the log) but the servlet
container is throwing concurrentmodificationexception!  anybody knows y is this
happening??  seems that it could get though the action but when the servlet
container is formatting the HTML(or running the generated xxx$jsp.java) there is
this wierd problem.


137908 [VBJ ThreadPool Worker] DEBUG
hk.com.dbsvickers.webapp.framework.sms.fw_MenuItemAdminAction  - addParm::
miaForm.getParms().size() = 0
processActionForward(menuItemAdmin.AddLayout, false)
insert page='/jsp/NavSideBar.jsp'.
insert page='/jsp/NavTopBar.jsp'.
insert page='/jsp/basicLayout.content.jsp'.
insert page='/jsp/menuItemAdminDetailsPane.jsp'.
ApplicationDispatcher[/SMS_Web]: Servlet.service() for servlet jsp threw
exception
java.util.ConcurrentModificationException
 at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:440)
 at java.util.AbstractList$Itr.next(AbstractList.java:413)
 at org.apache.struts.taglib.logic.IterateTag.doAfterBody(IterateTag.java:423)
 at
org.apache.struts.taglib.nested.logic.NestedIterateTag.doAfterBody(NestedIterate
Tag.java:157)
 at
org.apache.jsp.menuItemAdminDetailsPane$jsp._jspService(menuItemAdminDetailsPane
$jsp.java:960)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:2
02)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:382)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:474)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
 at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java
:679)
 at
org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.j
ava:570)
 at
org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.jav
a:493)
 at
org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:818)
 at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:390)
 at
org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:8
65)
 at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:487)
 at
org.apache.jsp.basicLayout$content$jsp._jspService(basicLayout$content$jsp.java:
336)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
many many more......
.
.
.
.
.
.



  'menuItemAdmin.AddLayout' - processed as definition




regards,

dave


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