If the collection you are iterating is not synchronized, you can get this error if you remove or add elements. Try using java.util.Vector as your collection implementation.
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Martes, 02 de Marzo de 2004 03:12 p.m. To: [EMAIL PROTECTED] Subject: RE: ConcurrentModificationException genarally you get this error with lists if you are iterating over list and remove element/add element to list.. -----Original Message----- From: Sergei P. Volin [mailto:[EMAIL PROTECTED] Sent: Tuesday, March 02, 2004 7:08 PM To: Struts Users Mailing List Subject: Re: ConcurrentModificationException The exception arised by doAfterBody method of IterateTag class, namely at </logic:iterate>. It means that at least one time the body of iteration was done. I can guarantee that inside itereator tags - <logic:iterate>...</logic:iterate> I do not change nor iterator either session attributes - just reading of session beans. So if smth of that changes is that only due to some kind of requests interaction. I don't know how it could be. This is really painful to me since I can't even think what could it be and the issue persists from time to time. And again - the application works smoothly when there is no collision of requests. ----- Original Message ----- From: "Brad Balmer" <[EMAIL PROTECTED]> To: "Struts Users Mailing List" <[EMAIL PROTECTED]> Sent: Tuesday, March 02, 2004 8:49 PM Subject: Re: ConcurrentModificationException | | Any chance that you were iterating through your HttpSession removing | attributes? | | Sergei P. Volin wrote: | | >Greetings! | > | >Why did I get this message when sending two concurent requests to the same page? | >I'm using: | >1) RH8.0, Linux 2.4.18 #2 SMP | >2) java version "1.4.0" | >Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0) | >Classic VM (build 1.4.0, J2RE 1.4.0 IBM build cxia32140-20020917a | >(JIT enabled: jitc)) | >3) Tomcat 5.0.19 | >4) Struts 1.1 | > | >The same exception I've got on 4.1.24. I really have problems (with | >other symptoms) with concurrent requests. Not often (because server is not highly exploited) but persisted. And more often on Linux platform than on Windows. Why so? Could it be a jvm issue? Or may be Tomcat? Or Struts? Or mine? Without concurrent requests application works smoothly. | > | >Regards, | > | >Sergei Volin. | > | >HTTP Status 500 - | > | >----------------------------------------------------------------------- >---- ----- | > | >type Exception report | > | >message | > | >description The server encountered an internal error () that | >prevented it from fulfilling this request. | > | >exception | > | >org.apache.jasper.JasperException | > org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.ja va:3 58) | > org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java: | > 301) | > org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248) | > javax.servlet.http.HttpServlet.service(HttpServlet.java:856) | > org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.jav a:10 69) | > org.apache.struts.action.RequestProcessor.processForwardConfig(RequestPr oces sor.java:455) | > org.apache.struts.action.RequestProcessor.process(RequestProcessor.java: 279) | > org.apache.struts.action.ActionServlet.process(ActionServlet.java:14 | > 82) | > org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507) | > javax.servlet.http.HttpServlet.service(HttpServlet.java:743) | > javax.servlet.http.HttpServlet.service(HttpServlet.java:856) | > com.volin.filters.CompressionFilter.doFilter(CompressionFilter.java:85) | > | >root cause | > | >java.util.ConcurrentModificationException | > | >java.util.AbstractList$Itr.checkForComodification(AbstractList.java:444 ) | > java.util.AbstractList$Itr.next(AbstractList.java:417) | > org.apache.struts.taglib.logic.IterateTag.doAfterBody(IterateTag.java:40 1) | > org.apache.jsp.admin.sidEditorSurveys_jsp._jspService(sidEditorSurveys_j sp.j ava:1214) | > org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133) | > javax.servlet.http.HttpServlet.service(HttpServlet.java:856) | > org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.ja va:3 11) | > org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java: | > 301) | > org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248) | > javax.servlet.http.HttpServlet.service(HttpServlet.java:856) | > org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.jav a:10 69) | > org.apache.struts.action.RequestProcessor.processForwardConfig(RequestPr oces sor.java:455) | > org.apache.struts.action.RequestProcessor.process(RequestProcessor.java: 279) | > org.apache.struts.action.ActionServlet.process(ActionServlet.java:14 | > 82) | > org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507) | > javax.servlet.http.HttpServlet.service(HttpServlet.java:743) | > javax.servlet.http.HttpServlet.service(HttpServlet.java:856) | > com.volin.filters.CompressionFilter.doFilter(CompressionFilter.java:85) | > | >note The full stack trace of the root cause is available in the | >Tomcat logs. | > | > | >----------------------------------------------------------------------- >---- ----- | > | >Apache Tomcat/5.0.19 | > | > | | | --------------------------------------------------------------------- | To unsubscribe, e-mail: [EMAIL PROTECTED] | For additional commands, e-mail: [EMAIL PROTECTED] | | --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] NOTA DE CONFIDENCIALIDAD Este mensaje (y sus anexos) es confidencial, esta dirigido exclusivamente a las personas direccionadas en el mail y puede contener informacion (i)de propiedad exclusiva de Interbanking S.A. o (ii) amparada por el secreto profesional. 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