I know this and I do not add/remove elements to/from list at all. Just as I said - only reading elements from list. Are jsps (Tomcat) thread safe? I'm really worry about that.
----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, March 02, 2004 9:11 PM 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.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] | | | --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
