Hallo Meissa, I don't consider it a problem or bad practice to use an ActionForm for what you are doing (I am using the same approach). I cannot see, that the direct way will change something. But why not give it a try. Is it possible that you have some race conditions in your execute method? You know, that your action has to be thread safe. And if your TechnicalException is thrown, why don't you forward to an error page? Regards, Dirk *************************************************************** mSanf> Dirk, mSanf> my paramForm scope is request. mSanf> When the error occurs, it occurs for all users. mSanf> And the only way to handle error is to restart tomcat, mSanf> I'm modifying the code to have much more logs when errors occurs. mSanf> I have one question. Do you thing better to go through ActionForm mSanf> for sending objects to jsp. mSanf> That's what I'm doing everytime but I'm getting more and more doubtful mSanf> with this way of doing. mSanf> In that case, I could simply put the paramList in the request and iterate mSanf> over mSanf> it in the jsp instead of setting it in the actionForm and so ... mSanf> What is your opinion about that ? mSanf> Dirk Markert mSanf> 24/06/2003 12:43 mSanf> Veuillez répondre à "Struts Users Mailing List" mSanf> Pour : "Struts Users Mailing List" mSanf> cc : mSanf> Objet : Re: Réf. : Re: Réf. : Re: Réf. : Re: very strange errors (no collection mSanf> found series) mSanf> Hallo Meissa, mSanf> if the error occurs. Does it occur thereafter for all users, or only mSanf> for the user who gets the error. If this user logs out and then logs mSanf> in, does the error reappear? Is the only way to handle the error a mSanf> restart of tomcat? mSanf> Also, what is the scope of your "paramForm"? mSanf> Regards, mSanf> Dirk mSanf> *************************************************************** mSanf>> I'm trying to find out why the paramList attribute of mSanf>> my param could be null. mSanf>> Here is the execute method of my action. mSanf>> ActionForward forward = null; mSanf>> initUser(request); mSanf>> HttpSession session = request.getSession(false); mSanf>> UserView userView = (UserView) mSanf> session.getAttribute("userView"); mSanf>> ArrayList paramList =null; mSanf>> BrowseParamHandler handler = new mSanf> BrowseParamHandler(); mSanf>> try mSanf>> { mSanf>> paramList = mSanf> handler.executeGetAllParams(userView); mSanf>> } mSanf>> catch (TechnicalException e) mSanf>> { mSanf>> System.out.println(e.getMessage() ); mSanf>> } mSanf>> ((ParamForm) form).setParamList(paramList); mSanf>> forward = mapping.findForward("success"); mSanf>> return forward; mSanf>> As you can see in bold, the param list is initialize to null. mSanf>> But I can't imagine it to be null because the mSanf> executegetAllParams(...) mSanf>> always returns values mSanf>> when the bug occurs. mSanf>> Do you think I have to inititialize the list ... mSanf>> Meissa mSanf>> Dirk Markert mSanf>> 24/06/2003 11:25 mSanf>> Veuillez répondre à "Struts Users Mailing List" mSanf>> Pour : "Struts Users Mailing List" mSanf> mSanf>> cc : mSanf>> Objet : Re: Réf. : Re: Réf. : Re: very strange errors (no mSanf> collection found series) mSanf>> Hallo Meissa, mSanf>> what I found out is: mSanf>> The exception you get is raised in the iterate tag of struts (line mSanf>> 281, IterateTag.java). The reason is, as you can guess, that your mSanf>> property "paramList" from "paramForm" is null. So the question is, mSanf> why mSanf>> is it null? Are there any circumstances possible under which this mSanf> can mSanf>> happen? mSanf>> Regards, mSanf>> Dirk mSanf>> *************************************************************** mSanf>>> Dirk, mSanf>>> here is the sensible extract of the jsp mSanf>>> >> mSanf>>> > property="index" type="java.lang.String"/> mSanf>>> > property="code" type="java.lang.String"/> mSanf>>> "> mSanf>>> <% mSanf>>> String mSanf>>> mSanf>> mSanf> updateUrl="/paramInitUpdate.do?task=initUpdateParam&codeParam="+codeParam; mSanf>>> %> mSanf>>> mSanf>>> > action="<%=editUrl%>">>> mSanf>>> mSanf>>> >> mSanf>>> > property="registrationDate"/> mSanf>>> >> mSanf>>> mSanf>>> > action="<%=updateUrl%>"> alt="Modifier" border="0"/>>> mSanf>>> mSanf>>> mSanf>>> mSanf>>> A simple logic iterate tag . I'm iterating the paramList mSanf> attribute mSanf>> which mSanf>>> is an ArrayList property of the"paramForm" that is put in the mSanf>> request mSanf>>> from the action. mSanf>>> I know I could simply put the paramList in the request directly... mSanf>>> Do you think there is something I'm doing wrong. mSanf>>> Meissa mSanf>>> Dirk Markert mSanf>>> 24/06/2003 09:55 mSanf>>> Veuillez répondre à "Struts Users Mailing List" mSanf>>> Pour : "Struts Users Mailing List" mSanf>> mSanf>>> cc : mSanf>>> Objet : Re: Réf. : Re: very strange errors (no collection mSanf>> found series) mSanf>>> Hallo Meissa, mSanf>>> can you send the part of your jsp with the iterate tag? This would mSanf>>> help. mSanf>>> Regards, mSanf>>> Dirk mSanf>>> *************************************************************** mSanf>>>> Dirk, mSanf>>>> I'm using tomcat 4.1.18 and i have asked tomcat user list before. mSanf>>>> It seem like the problem is caused by a logic iterate tag ... mSanf>>>> But till now, I haven't found the real cause. mSanf>>>> Meissa mSanf>>>> Dirk Markert mSanf>>>> 24/06/2003 08:45 mSanf>>>> Veuillez ripondre ` "Struts Users Mailing List" mSanf>>>> Pour : "Struts Users Mailing List" mSanf>>> mSanf>>>> cc : mSanf>>>> Objet : Re: very strange errors (no collection found mSanf>>> series) mSanf>>>> Hallo Meissa, mSanf>>>> what version of tomcat are you using. Maybe you should also ask mSanf>> the mSanf>>>> tomcat list? mSanf>>>> Regards, mSanf>>>> Dirk mSanf>>>> *************************************************************** mSanf>>>>> I'm having a very strange behaviour of my application. mSanf>>>>> It has been tested in pre-production environnement and mSanf>>>>> everything worked fine. mSanf>>>>> When in production, it works but no fine at all ! mSanf>>>>> The application works well for about five or six days and mSanf>>>>> when we try to access some pages, we get a no No collection mSanf> found mSanf>>>> exception. mSanf>>>>> when we restart Tomcat(without making any change to the code) mSanf>>> every mSanf>>>> thing mSanf>>>>> works fine again. mSanf>>>>> here is an extract of the exception: mSanf>>>>> javax.servlet.ServletException: No collection found mSanf>>>>> at mSanf>>>>> mSanf>>>> mSanf>>> mSanf>> mSanf> org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:530) mSanf>>>>> at mSanf>>>>> mSanf>>>> mSanf>>> mSanf>> mSanf> org.apache.jsp.listParamVL_jsp._jspService(listParamVL_jsp.java:374) mSanf>>>>> at mSanf>>>>> mSanf>>> mSanf> org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137) mSanf>>>>> at mSanf>>>> javax.servlet.http.HttpServlet.service(HttpServlet.java:853) mSanf>>>>> As you can see it, the probleme seems to come from the mSanf>>>> listParamVL_jsp. mSanf>>>>> when I open the generated servlet file, at line 374, I have the mSanf>>>> code below mSanf>>>>> : mSanf>>>>> if (_jspxFactory != null) mSanf>>>> _jspxFactory.releasePageContext(pageContext); mSanf>>>>> I really don't know what to do to determine the bug origin. mSanf>>>>> If someone has an idea or a suggestion, I would greatly mSanf>> appreciate mSanf>>>> it. mSanf>>>>> Meissa mSanf>>>>> L'integrite de ce message n'etant pas assuree sur internet, mSanf>>> Natexis mSanf>>>>> Banques Populaires ne peut etre tenu responsable de mSanf>>>>> son contenu. Toute utilisation ou diffusion non autorisee est mSanf>>>>> interdite. Si vous n'etes pas destinataire de ce message, merci mSanf>> de mSanf>>>> le mSanf>>>>> detruire et d'avertir l'expediteur. mSanf>>>>> The integrity of this message cannot be guaranteed mSanf>>>>> on the Internet. Natexis Banques Populaires can not therefore be mSanf>>>>> considered responsible for the contents.Any unauthorized use or mSanf>>>> dissemination is prohibited. mSanf>>>>> If you are not the intended recipient of this message, then mSanf>> please mSanf>>>> delete it and mSanf>>>>> notify the sender. mSanf>>>> mSanf>>> mSanf>> mSanf> --------------------------------------------------------------------- mSanf>>>> To unsubscribe, e-mail: mSanf> struts-user-unsubscribe@jakarta.apache.org mSanf>>>> For additional commands, e-mail: mSanf>>> struts-user-help@jakarta.apache.org mSanf>>>> L'integrite de ce message n'etant pas assuree sur internet, mSanf>> Natexis mSanf>>>> Banques Populaires ne peut etre tenu responsable de mSanf>>>> son contenu. Toute utilisation ou diffusion non autorisee est mSanf>>>> interdite. Si vous n'etes pas destinataire de ce message, merci mSanf> de mSanf>>> le mSanf>>>> detruire et d'avertir l'expediteur. mSanf>>>> The integrity of this message cannot be guaranteed mSanf>>>> on the Internet. Natexis Banques Populaires can not therefore be mSanf>>>> considered responsible for the contents.Any unauthorized use or mSanf>>> dissemination is prohibited. mSanf>>>> If you are not the intended recipient of this message, then mSanf> please mSanf>>> delete it and mSanf>>>> notify the sender. mSanf>>> mSanf>> mSanf> --------------------------------------------------------------------- mSanf>>> To unsubscribe, e-mail: struts-user-unsubscribe@jakarta.apache.org mSanf>>> For additional commands, e-mail: mSanf>> struts-user-help@jakarta.apache.org mSanf>>> L'integrite de ce message n'etant pas assuree sur internet, mSanf> Natexis mSanf>>> Banques Populaires ne peut etre tenu responsable de mSanf>>> son contenu. Toute utilisation ou diffusion non autorisee est mSanf>>> interdite. Si vous n'etes pas destinataire de ce message, merci de mSanf>> le mSanf>>> detruire et d'avertir l'expediteur. mSanf>>> The integrity of this message cannot be guaranteed mSanf>>> on the Internet. Natexis Banques Populaires can not therefore be mSanf>>> considered responsible for the contents.Any unauthorized use or mSanf>> dissemination is prohibited. mSanf>>> If you are not the intended recipient of this message, then please mSanf>> delete it and mSanf>>> notify the sender. mSanf>> mSanf> --------------------------------------------------------------------- mSanf>> To unsubscribe, e-mail: struts-user-unsubscribe@jakarta.apache.org mSanf>> For additional commands, e-mail: mSanf> struts-user-help@jakarta.apache.org mSanf>> L'integrite de ce message n'etant pas assuree sur internet, Natexis mSanf>> Banques Populaires ne peut etre tenu responsable de mSanf>> son contenu. Toute utilisation ou diffusion non autorisee est mSanf>> interdite. Si vous n'etes pas destinataire de ce message, merci de mSanf> le mSanf>> detruire et d'avertir l'expediteur. mSanf>> The integrity of this message cannot be guaranteed mSanf>> on the Internet. Natexis Banques Populaires can not therefore be mSanf>> considered responsible for the contents.Any unauthorized use or mSanf> dissemination is prohibited. mSanf>> If you are not the intended recipient of this message, then please mSanf> delete it and mSanf>> notify the sender. mSanf> --------------------------------------------------------------------- mSanf> To unsubscribe, e-mail: struts-user-unsubscribe@jakarta.apache.org mSanf> For additional commands, e-mail: struts-user-help@jakarta.apache.org mSanf> L'integrite de ce message n'etant pas assuree sur internet, Natexis mSanf> Banques Populaires ne peut etre tenu responsable de mSanf> son contenu. Toute utilisation ou diffusion non autorisee est mSanf> interdite. Si vous n'etes pas destinataire de ce message, merci de le mSanf> detruire et d'avertir l'expediteur. mSanf> The integrity of this message cannot be guaranteed mSanf> on the Internet. Natexis Banques Populaires can not therefore be mSanf> considered responsible for the contents.Any unauthorized use or dissemination is prohibited. mSanf> If you are not the intended recipient of this message, then please delete it and mSanf> notify the sender. --------------------------------------------------------------------- To unsubscribe, e-mail: struts-user-unsubscribe@jakarta.apache.org For additional commands, e-mail: struts-user-help@jakarta.apache.org