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.java: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.java:10 69) | > org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProces sor.java:455) | > org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279) | > org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482) | > 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:401) | > org.apache.jsp.admin.sidEditorSurveys_jsp._jspService(sidEditorSurveys_jsp.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.java: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.java:10 69) | > org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProces sor.java:455) | > org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279) | > org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482) | > 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]
