RE: problem with bean having session scope
THANX A LOT Joe !!! :) All my problems with session scope beans are now resolved :) So what was exactly the problem ? (it could be usefull to others, I guess) Well, to instantiate my beans, I always put the following line in my jsp files: jsp:useBean id=xxxform scope=session class=XxxForm/ But, as Joe wrote : This is just a shot in the dark...but perhaps the explicit creation you are specifying by the jsp:useBean tag is screwing up Strut's management of the ActionForm bean? In any case, you don't need to use the jsp:useBean tag at all for ActionForm beans, as Struts takes care of instantiating, And indeed, that seemed to be the main problem ! So, thanx again Joe, for your patience and all your help :) Friendly Regards, Slimane PS: pfiou, I'm happy that problem is finally resolved :) At 02:27 16/03/2002 +0100, Someone poor demented soul by the name of Slimane presented us with the following text which may contain useless information. okay, thanx a lot for your help :) I'll try the second method tomorrow (now it's 2am and I'm feeling sleepy :) Friendly Regards, Slimane At 17:02 15/03/2002 -0800, Someone poor demented soul by the name of Joseph Barefoot presented us with the following text which may contain useless information. Yep, that's what I meant, mis-type on my part there. hmmm...so you want 3 ActionForm beans to be instantiated when a single Action is delegated to, but don't want to use nested forms? Okay, you can do this two (maybe more) ways: 1. You could chain your actionforwards such that the Action called forwards to a second Action, the second Action forwards to a 3rd, etc., and thus your ActionForms get instantiated. The final Action in the chain then forwards to whatever page you wanted the user to see. 2. The Action (call it Action A) that is called when it's associated URI is requested explicitly creates whatever ActionForms you want and initializes them with setXXX methods. Then Action A places these form beans into the HTTPRequest object as attributes with the SAME NAME that struts would use for the attribute, i.e. the logical name specified in the action-mapping for the form bean. Then, when subsequent URI's are requested associated with other Actions, if Struts finds that an attribute with the associated (with the particular Action) form bean's logical name already exists, it will use that object rather than instantiating a new one (I'm pretty sure that's how it works). The only drawback is that you would have to make sure that Action A's URI is requested BEFORE the other Actions' URIs, so that your logic will initialize and store the ActionForm beans rather than the Struts framework. whew. I don't know if that helps, but it's the best I could come up with based on what I know about Struts. :) A final consideration: Is is possible that 2 of the 3 beans don't need to be ActionForm beans at all, but just value objects that are created and stored in the session? -Original Message- From: Slimane [mailto:[EMAIL PROTECTED]] Sent: Friday, March 15, 2002 3:49 PM To: Struts Users Mailing List Subject: RE: problem with bean having session scope Hi, Thanx again for your answer :) The problem is that I don't want to nest my ActionForm, I want them all treated as a unique session bean. Without them being into (dependant of) another ActionForm. so you can retrieve them from other Actions/JSPs by using request.getAttribute( ActionForm logical name ). I suppose you meant request.getSession().getAttribute( ActionForm logical name ), didn't you ? :) Friendly Regards, Slimane At 15:12 15/03/2002 -0800, Someone poor demented soul by the name of Joseph Barefoot presented us with the following text which may contain useless information. Valid questions, all. :) I have to admit I'm not 100% sure when the ActionForm bean is first instantiated/initialized, but this is what I think: The ActionForm bean is created and initialized when the URI specified by the action-mapping for this particular Action/ActionForm pair is requested. (if this is incorrect, please someone correct me) If you want to share beans, just declare the scope to be session for the bean in question in the action-mapping for this action inside struts-config.xml. Struts stores these beans as attributes in the HTTPSession object, so you can retrieve them from other Actions/JSPs by using request.getAttribute( ActionForm logical name ). As for the last question, ActionForm beans can appear as fields inside other ActionForms, so you can nest your form beans such that when one gets instantiated, all of the nested form fields get instantiated too. Then you can reference them as nested attributes of the parent ActionForm inside any of your Struts JSP tags. You can also retrieve them from the session in a similar manner: request.getAttribute( ActionForm logical name ).getMyNestedForm() happy coding, Joe -Original Message- From: Slimane [mailto:[EMAIL
problem with bean having session scope
Hi, I have 3 form beans. Each of them have a session scope defined in the struts-config.xml. Here's the config for one of them: action path=/piechart type=be.stluc.info.struts.PieChartAction name=piechartform scope=session When I try to access them in one of my Action class, I don't have any problem. But when I try to access them, from one other Action class, then suddenly, they don't exist anymore. I used the piece of code, Mr Keith Bacon posted in reply of one of my previous mail ( http://www.mail-archive.com/struts-user@jakarta.apache.org/msg25984.html ) And that so, I saw that one time, my session contains all three form beans and another time my session contains only one form bean. Here's the code I use in my Action classes: ParticipantDetailsForm partDetForm = (ParticipantDetailsForm) request.getSession().getAttribute(participantdetailsform); (participantdetailsform is one of the 3 form beans I share in the session) Could anyone give me pointers where I should look for ? Because, I'm sure it's a stupid mistake but I can't find it :( Thanx in advance. Friendly Regards, Slimane -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: problem with bean having session scope
well as nobody seems to have a clue about my problem. I'll ask my question differently :) When is a session bean destroyed ? If I specify, a form bean to have a session scope (as I did in the struts-config.xml), when will it be destroyed ? I suppose the form bean is created the first time I use a jsp:useBean tag in my jsp file, isn't it ? (for example: jsp:useBean id=searchbydateform scope=session class=be.stluc.info.struts.SearchByDateForm/) Finally, what could be the reasons, that some of my Action classes see (can use their values) some session beans, while others don't ? Thanx for having taken the time to read me :) Friendly Regards, Slimane At 12:11 15/03/2002 +0100, you wrote: Hi, I have 3 form beans. Each of them have a session scope defined in the struts-config.xml. Here's the config for one of them: action path=/piechart type=be.stluc.info.struts.PieChartAction name=piechartform scope=session When I try to access them in one of my Action class, I don't have any problem. But when I try to access them, from one other Action class, then suddenly, they don't exist anymore. I used the piece of code, Mr Keith Bacon posted in reply of one of my previous mail ( http://www.mail-archive.com/struts-user@jakarta.apache.org/msg25984.html ) And that so, I saw that one time, my session contains all three form beans and another time my session contains only one form bean. Here's the code I use in my Action classes: ParticipantDetailsForm partDetForm = (ParticipantDetailsForm) request.getSession().getAttribute(participantdetailsform); (participantdetailsform is one of the 3 form beans I share in the session) Could anyone give me pointers where I should look for ? Because, I'm sure it's a stupid mistake but I can't find it :( Thanx in advance. Friendly Regards, Slimane -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: problem with bean having session scope
AFAIK, a session bean is destroyed when the session expires (30 min by default). Otavio - Original Message - From: Slimane Zouggari [EMAIL PROTECTED] To: Struts Users Mailing List [EMAIL PROTECTED] Sent: Friday, March 15, 2002 12:02 PM Subject: Re: problem with bean having session scope well as nobody seems to have a clue about my problem. I'll ask my question differently :) When is a session bean destroyed ? If I specify, a form bean to have a session scope (as I did in the struts-config.xml), when will it be destroyed ? I suppose the form bean is created the first time I use a jsp:useBean tag in my jsp file, isn't it ? (for example: jsp:useBean id=searchbydateform scope=session class=be.stluc.info.struts.SearchByDateForm/) Finally, what could be the reasons, that some of my Action classes see (can use their values) some session beans, while others don't ? Thanx for having taken the time to read me :) Friendly Regards, Slimane At 12:11 15/03/2002 +0100, you wrote: Hi, I have 3 form beans. Each of them have a session scope defined in the struts-config.xml. Here's the config for one of them: action path=/piechart type=be.stluc.info.struts.PieChartAction name=piechartform scope=session When I try to access them in one of my Action class, I don't have any problem. But when I try to access them, from one other Action class, then suddenly, they don't exist anymore. I used the piece of code, Mr Keith Bacon posted in reply of one of my previous mail ( http://www.mail-archive.com/struts-user@jakarta.apache.org/msg25984.html ) And that so, I saw that one time, my session contains all three form beans and another time my session contains only one form bean. Here's the code I use in my Action classes: ParticipantDetailsForm partDetForm = (ParticipantDetailsForm) request.getSession().getAttribute(participantdetailsform); (participantdetailsform is one of the 3 form beans I share in the session) Could anyone give me pointers where I should look for ? Because, I'm sure it's a stupid mistake but I can't find it :( Thanx in advance. Friendly Regards, Slimane -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
Re: problem with bean having session scope
Thanx, I supposed it was something like that :) The thing is, I still don't understand why my beans aren't shared among all of my action classes :( Friendly Regards, Slimane At 12:05 15/03/2002 -0500, you wrote: AFAIK, a session bean is destroyed when the session expires (30 min by default). Otavio - Original Message - From: Slimane Zouggari [EMAIL PROTECTED] To: Struts Users Mailing List [EMAIL PROTECTED] Sent: Friday, March 15, 2002 12:02 PM Subject: Re: problem with bean having session scope well as nobody seems to have a clue about my problem. I'll ask my question differently :) When is a session bean destroyed ? If I specify, a form bean to have a session scope (as I did in the struts-config.xml), when will it be destroyed ? I suppose the form bean is created the first time I use a jsp:useBean tag in my jsp file, isn't it ? (for example: jsp:useBean id=searchbydateform scope=session class=be.stluc.info.struts.SearchByDateForm/) Finally, what could be the reasons, that some of my Action classes see (can use their values) some session beans, while others don't ? Thanx for having taken the time to read me :) Friendly Regards, Slimane At 12:11 15/03/2002 +0100, you wrote: Hi, I have 3 form beans. Each of them have a session scope defined in the struts-config.xml. Here's the config for one of them: action path=/piechart type=be.stluc.info.struts.PieChartAction name=piechartform scope=session When I try to access them in one of my Action class, I don't have any problem. But when I try to access them, from one other Action class, then suddenly, they don't exist anymore. I used the piece of code, Mr Keith Bacon posted in reply of one of my previous mail ( http://www.mail-archive.com/struts-user@jakarta.apache.org/msg25984.html ) And that so, I saw that one time, my session contains all three form beans and another time my session contains only one form bean. Here's the code I use in my Action classes: ParticipantDetailsForm partDetForm = (ParticipantDetailsForm) request.getSession().getAttribute(participantdetailsform); (participantdetailsform is one of the 3 form beans I share in the session) Could anyone give me pointers where I should look for ? Because, I'm sure it's a stupid mistake but I can't find it :( Thanx in advance. Friendly Regards, Slimane -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
RE: problem with bean having session scope
I suppose the form bean is created the first time I use a jsp:useBean tag in my jsp file, isn't it ? (for example: jsp:useBean id=searchbydateform scope=session class=be.stluc.info.struts.SearchByDateForm/) Actually, the creation of the ActionForm bean is handled by the Struts framework itself (I guess by the controller servlet?). That's how forms can be populated automatically via the Struts taglibs and then passed to the Action class associated with this particular ActionForm class. This is just a shot in the dark...but perhaps the explicit creation you are specifying by the jsp:useBean tag is screwing up Strut's management of the ActionForm bean? In any case, you don't need to use the jsp:useBean tag at all for ActionForm beans, as Struts takes care of instantiating, read/writes, and scope management for these beans. --joe -Original Message- From: Slimane Zouggari [mailto:[EMAIL PROTECTED]] Sent: Friday, March 15, 2002 9:15 AM To: Struts Users Mailing List Subject: Re: problem with bean having session scope Thanx, I supposed it was something like that :) The thing is, I still don't understand why my beans aren't shared among all of my action classes :( Friendly Regards, Slimane At 12:05 15/03/2002 -0500, you wrote: AFAIK, a session bean is destroyed when the session expires (30 min by default). Otavio - Original Message - From: Slimane Zouggari [EMAIL PROTECTED] To: Struts Users Mailing List [EMAIL PROTECTED] Sent: Friday, March 15, 2002 12:02 PM Subject: Re: problem with bean having session scope well as nobody seems to have a clue about my problem. I'll ask my question differently :) When is a session bean destroyed ? If I specify, a form bean to have a session scope (as I did in the struts-config.xml), when will it be destroyed ? I suppose the form bean is created the first time I use a jsp:useBean tag in my jsp file, isn't it ? (for example: jsp:useBean id=searchbydateform scope=session class=be.stluc.info.struts.SearchByDateForm/) Finally, what could be the reasons, that some of my Action classes see (can use their values) some session beans, while others don't ? Thanx for having taken the time to read me :) Friendly Regards, Slimane At 12:11 15/03/2002 +0100, you wrote: Hi, I have 3 form beans. Each of them have a session scope defined in the struts-config.xml. Here's the config for one of them: action path=/piechart type=be.stluc.info.struts.PieChartAction name=piechartform scope=session When I try to access them in one of my Action class, I don't have any problem. But when I try to access them, from one other Action class, then suddenly, they don't exist anymore. I used the piece of code, Mr Keith Bacon posted in reply of one of my previous mail ( http://www.mail-archive.com/struts-user@jakarta.apache.org/msg25984.html ) And that so, I saw that one time, my session contains all three form beans and another time my session contains only one form bean. Here's the code I use in my Action classes: ParticipantDetailsForm partDetForm = (ParticipantDetailsForm) request.getSession().getAttribute(participantdetailsform); (participantdetailsform is one of the 3 form beans I share in the session) Could anyone give me pointers where I should look for ? Because, I'm sure it's a stupid mistake but I can't find it :( Thanx in advance. Friendly Regards, Slimane -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
RE: problem with bean having session scope
Hi, Thanks for your answer, I'll try to remove the jsp:useBean tag. But I still do have a question :) You say that: Struts takes care of instantiating, read/writes, and scope management for these beans well, then when does he do that ? The first time I call the Action Class ? If so, what if I want to share 3 beans ? The first time I'll call one Action Class, only one ActionForm will be instanciated, no ? Friendly Regards, Slimane At 10:03 15/03/2002 -0800, Someone poor demented soul by the name of Joseph Barefoot presented us with the following text which may contain useless information. I suppose the form bean is created the first time I use a jsp:useBean tag in my jsp file, isn't it ? (for example: jsp:useBean id=searchbydateform scope=session class=be.stluc.info.struts.SearchByDateForm/) Actually, the creation of the ActionForm bean is handled by the Struts framework itself (I guess by the controller servlet?). That's how forms can be populated automatically via the Struts taglibs and then passed to the Action class associated with this particular ActionForm class. This is just a shot in the dark...but perhaps the explicit creation you are specifying by the jsp:useBean tag is screwing up Strut's management of the ActionForm bean? In any case, you don't need to use the jsp:useBean tag at all for ActionForm beans, as Struts takes care of instantiating, read/writes, and scope management for these beans. --joe -Original Message- From: Slimane Zouggari [mailto:[EMAIL PROTECTED]] Sent: Friday, March 15, 2002 9:15 AM To: Struts Users Mailing List Subject: Re: problem with bean having session scope Thanx, I supposed it was something like that :) The thing is, I still don't understand why my beans aren't shared among all of my action classes :( Friendly Regards, Slimane At 12:05 15/03/2002 -0500, you wrote: AFAIK, a session bean is destroyed when the session expires (30 min by default). Otavio - Original Message - From: Slimane Zouggari [EMAIL PROTECTED] To: Struts Users Mailing List [EMAIL PROTECTED] Sent: Friday, March 15, 2002 12:02 PM Subject: Re: problem with bean having session scope well as nobody seems to have a clue about my problem. I'll ask my question differently :) When is a session bean destroyed ? If I specify, a form bean to have a session scope (as I did in the struts-config.xml), when will it be destroyed ? I suppose the form bean is created the first time I use a jsp:useBean tag in my jsp file, isn't it ? (for example: jsp:useBean id=searchbydateform scope=session class=be.stluc.info.struts.SearchByDateForm/) Finally, what could be the reasons, that some of my Action classes see (can use their values) some session beans, while others don't ? Thanx for having taken the time to read me :) Friendly Regards, Slimane At 12:11 15/03/2002 +0100, you wrote: Hi, I have 3 form beans. Each of them have a session scope defined in the struts-config.xml. Here's the config for one of them: action path=/piechart type=be.stluc.info.struts.PieChartAction name=piechartform scope=session When I try to access them in one of my Action class, I don't have any problem. But when I try to access them, from one other Action class, then suddenly, they don't exist anymore. I used the piece of code, Mr Keith Bacon posted in reply of one of my previous mail ( http://www.mail-archive.com/struts-user@jakarta.apache.org/msg25984.html ) And that so, I saw that one time, my session contains all three form beans and another time my session contains only one form bean. Here's the code I use in my Action classes: ParticipantDetailsForm partDetForm = (ParticipantDetailsForm) request.getSession().getAttribute(participantdetailsform); (participantdetailsform is one of the 3 form beans I share in the session) Could anyone give me pointers where I should look for ? Because, I'm sure it's a stupid mistake but I can't find it :( Thanx in advance. Friendly Regards, Slimane -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- Make it run, Make it right, Make it fast -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL
RE: problem with bean having session scope
Depends on whether it is a stateless or stateful session bean. There is no way of knowing (outside of a server crash) when a stateless bean will be destroyed. Mark -Original Message- From: Otavio C. Decio [mailto:[EMAIL PROTECTED]] Sent: Friday, March 15, 2002 12:05 PM To: Struts Users Mailing List Subject: Re: problem with bean having session scope AFAIK, a session bean is destroyed when the session expires (30 min by default). Otavio - Original Message - From: Slimane Zouggari [EMAIL PROTECTED] To: Struts Users Mailing List [EMAIL PROTECTED] Sent: Friday, March 15, 2002 12:02 PM Subject: Re: problem with bean having session scope well as nobody seems to have a clue about my problem. I'll ask my question differently :) When is a session bean destroyed ? If I specify, a form bean to have a session scope (as I did in the struts-config.xml), when will it be destroyed ? I suppose the form bean is created the first time I use a jsp:useBean tag in my jsp file, isn't it ? (for example: jsp:useBean id=searchbydateform scope=session class=be.stluc.info.struts.SearchByDateForm/) Finally, what could be the reasons, that some of my Action classes see (can use their values) some session beans, while others don't ? Thanx for having taken the time to read me :) Friendly Regards, Slimane At 12:11 15/03/2002 +0100, you wrote: Hi, I have 3 form beans. Each of them have a session scope defined in the struts-config.xml. Here's the config for one of them: action path=/piechart type=be.stluc.info.struts.PieChartAction name=piechartform scope=session When I try to access them in one of my Action class, I don't have any problem. But when I try to access them, from one other Action class, then suddenly, they don't exist anymore. I used the piece of code, Mr Keith Bacon posted in reply of one of my previous mail ( http://www.mail-archive.com/struts-user@jakarta.apache.org/msg25984.html ) And that so, I saw that one time, my session contains all three form beans and another time my session contains only one form bean. Here's the code I use in my Action classes: ParticipantDetailsForm partDetForm = (ParticipantDetailsForm) request.getSession().getAttribute(participantdetailsform); (participantdetailsform is one of the 3 form beans I share in the session) Could anyone give me pointers where I should look for ? Because, I'm sure it's a stupid mistake but I can't find it :( Thanx in advance. Friendly Regards, Slimane -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED] -- To unsubscribe, e-mail: mailto:[EMAIL PROTECTED] For additional commands, e-mail: mailto:[EMAIL PROTECTED]
RE: problem with bean having session scope
Valid questions, all. :) I have to admit I'm not 100% sure when the ActionForm bean is first instantiated/initialized, but this is what I think: The ActionForm bean is created and initialized when the URI specified by the action-mapping for this particular Action/ActionForm pair is requested. (if this is incorrect, please someone correct me) If you want to share beans, just declare the scope to be session for the bean in question in the action-mapping for this action inside struts-config.xml. Struts stores these beans as attributes in the HTTPSession object, so you can retrieve them from other Actions/JSPs by using request.getAttribute( ActionForm logical name ). As for the last question, ActionForm beans can appear as fields inside other ActionForms, so you can nest your form beans such that when one gets instantiated, all of the nested form fields get instantiated too. Then you can reference them as nested attributes of the parent ActionForm inside any of your Struts JSP tags. You can also retrieve them from the session in a similar manner: request.getAttribute( ActionForm logical name ).getMyNestedForm() happy coding, Joe -Original Message- From: Slimane [mailto:[EMAIL PROTECTED]] Sent: Friday, March 15, 2002 1:58 PM To: Struts Users Mailing List Subject: RE: problem with bean having session scope Hi, Thanks for your answer, I'll try to remove the jsp:useBean tag. But I still do have a question :) You say that: Struts takes care of instantiating, read/writes, and scope management for these beans well, then when does he do that ? The first time I call the Action Class ? If so, what if I want to share 3 beans ? The first time I'll call one Action Class, only one ActionForm will be instanciated, no ? Friendly Regards, Slimane At 10:03 15/03/2002 -0800, Someone poor demented soul by the name of Joseph Barefoot presented us with the following text which may contain useless information. I suppose the form bean is created the first time I use a jsp:useBean tag in my jsp file, isn't it ? (for example: jsp:useBean id=searchbydateform scope=session class=be.stluc.info.struts.SearchByDateForm/) Actually, the creation of the ActionForm bean is handled by the Struts framework itself (I guess by the controller servlet?). That's how forms can be populated automatically via the Struts taglibs and then passed to the Action class associated with this particular ActionForm class. This is just a shot in the dark...but perhaps the explicit creation you are specifying by the jsp:useBean tag is screwing up Strut's management of the ActionForm bean? In any case, you don't need to use the jsp:useBean tag at all for ActionForm beans, as Struts takes care of instantiating, read/writes, and scope management for these beans. --joe -Original Message- From: Slimane Zouggari [mailto:[EMAIL PROTECTED]] Sent: Friday, March 15, 2002 9:15 AM To: Struts Users Mailing List Subject: Re: problem with bean having session scope Thanx, I supposed it was something like that :) The thing is, I still don't understand why my beans aren't shared among all of my action classes :( Friendly Regards, Slimane At 12:05 15/03/2002 -0500, you wrote: AFAIK, a session bean is destroyed when the session expires (30 min by default). Otavio - Original Message - From: Slimane Zouggari [EMAIL PROTECTED] To: Struts Users Mailing List [EMAIL PROTECTED] Sent: Friday, March 15, 2002 12:02 PM Subject: Re: problem with bean having session scope well as nobody seems to have a clue about my problem. I'll ask my question differently :) When is a session bean destroyed ? If I specify, a form bean to have a session scope (as I did in the struts-config.xml), when will it be destroyed ? I suppose the form bean is created the first time I use a jsp:useBean tag in my jsp file, isn't it ? (for example: jsp:useBean id=searchbydateform scope=session class=be.stluc.info.struts.SearchByDateForm/) Finally, what could be the reasons, that some of my Action classes see (can use their values) some session beans, while others don't ? Thanx for having taken the time to read me :) Friendly Regards, Slimane At 12:11 15/03/2002 +0100, you wrote: Hi, I have 3 form beans. Each of them have a session scope defined in the struts-config.xml. Here's the config for one of them: action path=/piechart type=be.stluc.info.struts.PieChartAction name=piechartform scope=session When I try to access them in one of my Action class, I don't have any problem. But when I try to access them, from one other Action class, then suddenly, they don't exist anymore. I used the piece of code, Mr Keith Bacon posted in reply of one of my previous mail ( http://www.mail-archive.com/struts-user@jakarta.apache.org/msg25984.html ) And that so, I saw that one time
RE: problem with bean having session scope
Hi, Thanx again for your answer :) The problem is that I don't want to nest my ActionForm, I want them all treated as a unique session bean. Without them being into (dependant of) another ActionForm. so you can retrieve them from other Actions/JSPs by using request.getAttribute( ActionForm logical name ). I suppose you meant request.getSession().getAttribute( ActionForm logical name ), didn't you ? :) Friendly Regards, Slimane At 15:12 15/03/2002 -0800, Someone poor demented soul by the name of Joseph Barefoot presented us with the following text which may contain useless information. Valid questions, all. :) I have to admit I'm not 100% sure when the ActionForm bean is first instantiated/initialized, but this is what I think: The ActionForm bean is created and initialized when the URI specified by the action-mapping for this particular Action/ActionForm pair is requested. (if this is incorrect, please someone correct me) If you want to share beans, just declare the scope to be session for the bean in question in the action-mapping for this action inside struts-config.xml. Struts stores these beans as attributes in the HTTPSession object, so you can retrieve them from other Actions/JSPs by using request.getAttribute( ActionForm logical name ). As for the last question, ActionForm beans can appear as fields inside other ActionForms, so you can nest your form beans such that when one gets instantiated, all of the nested form fields get instantiated too. Then you can reference them as nested attributes of the parent ActionForm inside any of your Struts JSP tags. You can also retrieve them from the session in a similar manner: request.getAttribute( ActionForm logical name ).getMyNestedForm() happy coding, Joe -Original Message- From: Slimane [mailto:[EMAIL PROTECTED]] Sent: Friday, March 15, 2002 1:58 PM To: Struts Users Mailing List Subject: RE: problem with bean having session scope Hi, Thanks for your answer, I'll try to remove the jsp:useBean tag. But I still do have a question :) You say that: Struts takes care of instantiating, read/writes, and scope management for these beans well, then when does he do that ? The first time I call the Action Class ? If so, what if I want to share 3 beans ? The first time I'll call one Action Class, only one ActionForm will be instanciated, no ? Friendly Regards, Slimane At 10:03 15/03/2002 -0800, Someone poor demented soul by the name of Joseph Barefoot presented us with the following text which may contain useless information. I suppose the form bean is created the first time I use a jsp:useBean tag in my jsp file, isn't it ? (for example: jsp:useBean id=searchbydateform scope=session class=be.stluc.info.struts.SearchByDateForm/) Actually, the creation of the ActionForm bean is handled by the Struts framework itself (I guess by the controller servlet?). That's how forms can be populated automatically via the Struts taglibs and then passed to the Action class associated with this particular ActionForm class. This is just a shot in the dark...but perhaps the explicit creation you are specifying by the jsp:useBean tag is screwing up Strut's management of the ActionForm bean? In any case, you don't need to use the jsp:useBean tag at all for ActionForm beans, as Struts takes care of instantiating, read/writes, and scope management for these beans. --joe -Original Message- From: Slimane Zouggari [mailto:[EMAIL PROTECTED]] Sent: Friday, March 15, 2002 9:15 AM To: Struts Users Mailing List Subject: Re: problem with bean having session scope Thanx, I supposed it was something like that :) The thing is, I still don't understand why my beans aren't shared among all of my action classes :( Friendly Regards, Slimane At 12:05 15/03/2002 -0500, you wrote: AFAIK, a session bean is destroyed when the session expires (30 min by default). Otavio - Original Message - From: Slimane Zouggari [EMAIL PROTECTED] To: Struts Users Mailing List [EMAIL PROTECTED] Sent: Friday, March 15, 2002 12:02 PM Subject: Re: problem with bean having session scope well as nobody seems to have a clue about my problem. I'll ask my question differently :) When is a session bean destroyed ? If I specify, a form bean to have a session scope (as I did in the struts-config.xml), when will it be destroyed ? I suppose the form bean is created the first time I use a jsp:useBean tag in my jsp file, isn't it ? (for example: jsp:useBean id=searchbydateform scope=session class=be.stluc.info.struts.SearchByDateForm/) Finally, what could be the reasons, that some of my Action classes see (can use their values) some session beans, while others don't ? Thanx for having taken the time to read me :) Friendly Regards, Slimane At 12:11 15/03/2002 +0100, you wrote: Hi, I have 3 form
RE: problem with bean having session scope
Yep, that's what I meant, mis-type on my part there. hmmm...so you want 3 ActionForm beans to be instantiated when a single Action is delegated to, but don't want to use nested forms? Okay, you can do this two (maybe more) ways: 1. You could chain your actionforwards such that the Action called forwards to a second Action, the second Action forwards to a 3rd, etc., and thus your ActionForms get instantiated. The final Action in the chain then forwards to whatever page you wanted the user to see. 2. The Action (call it Action A) that is called when it's associated URI is requested explicitly creates whatever ActionForms you want and initializes them with setXXX methods. Then Action A places these form beans into the HTTPRequest object as attributes with the SAME NAME that struts would use for the attribute, i.e. the logical name specified in the action-mapping for the form bean. Then, when subsequent URI's are requested associated with other Actions, if Struts finds that an attribute with the associated (with the particular Action) form bean's logical name already exists, it will use that object rather than instantiating a new one (I'm pretty sure that's how it works). The only drawback is that you would have to make sure that Action A's URI is requested BEFORE the other Actions' URIs, so that your logic will initialize and store the ActionForm beans rather than the Struts framework. whew. I don't know if that helps, but it's the best I could come up with based on what I know about Struts. :) A final consideration: Is is possible that 2 of the 3 beans don't need to be ActionForm beans at all, but just value objects that are created and stored in the session? -Original Message- From: Slimane [mailto:[EMAIL PROTECTED]] Sent: Friday, March 15, 2002 3:49 PM To: Struts Users Mailing List Subject: RE: problem with bean having session scope Hi, Thanx again for your answer :) The problem is that I don't want to nest my ActionForm, I want them all treated as a unique session bean. Without them being into (dependant of) another ActionForm. so you can retrieve them from other Actions/JSPs by using request.getAttribute( ActionForm logical name ). I suppose you meant request.getSession().getAttribute( ActionForm logical name ), didn't you ? :) Friendly Regards, Slimane At 15:12 15/03/2002 -0800, Someone poor demented soul by the name of Joseph Barefoot presented us with the following text which may contain useless information. Valid questions, all. :) I have to admit I'm not 100% sure when the ActionForm bean is first instantiated/initialized, but this is what I think: The ActionForm bean is created and initialized when the URI specified by the action-mapping for this particular Action/ActionForm pair is requested. (if this is incorrect, please someone correct me) If you want to share beans, just declare the scope to be session for the bean in question in the action-mapping for this action inside struts-config.xml. Struts stores these beans as attributes in the HTTPSession object, so you can retrieve them from other Actions/JSPs by using request.getAttribute( ActionForm logical name ). As for the last question, ActionForm beans can appear as fields inside other ActionForms, so you can nest your form beans such that when one gets instantiated, all of the nested form fields get instantiated too. Then you can reference them as nested attributes of the parent ActionForm inside any of your Struts JSP tags. You can also retrieve them from the session in a similar manner: request.getAttribute( ActionForm logical name ).getMyNestedForm() happy coding, Joe -Original Message- From: Slimane [mailto:[EMAIL PROTECTED]] Sent: Friday, March 15, 2002 1:58 PM To: Struts Users Mailing List Subject: RE: problem with bean having session scope Hi, Thanks for your answer, I'll try to remove the jsp:useBean tag. But I still do have a question :) You say that: Struts takes care of instantiating, read/writes, and scope management for these beans well, then when does he do that ? The first time I call the Action Class ? If so, what if I want to share 3 beans ? The first time I'll call one Action Class, only one ActionForm will be instanciated, no ? Friendly Regards, Slimane At 10:03 15/03/2002 -0800, Someone poor demented soul by the name of Joseph Barefoot presented us with the following text which may contain useless information. I suppose the form bean is created the first time I use a jsp:useBean tag in my jsp file, isn't it ? (for example: jsp:useBean id=searchbydateform scope=session class=be.stluc.info.struts.SearchByDateForm/) Actually, the creation of the ActionForm bean is handled by the Struts framework itself (I guess by the controller servlet?). That's how forms can be populated automatically via the Struts taglibs and then passed to the Action class associated with this particular ActionForm class. This is just a shot in the dark
RE: problem with bean having session scope
okay, thanx a lot for your help :) I'll try the second method tomorrow (now it's 2am and I'm feeling sleepy :) Friendly Regards, Slimane At 17:02 15/03/2002 -0800, Someone poor demented soul by the name of Joseph Barefoot presented us with the following text which may contain useless information. Yep, that's what I meant, mis-type on my part there. hmmm...so you want 3 ActionForm beans to be instantiated when a single Action is delegated to, but don't want to use nested forms? Okay, you can do this two (maybe more) ways: 1. You could chain your actionforwards such that the Action called forwards to a second Action, the second Action forwards to a 3rd, etc., and thus your ActionForms get instantiated. The final Action in the chain then forwards to whatever page you wanted the user to see. 2. The Action (call it Action A) that is called when it's associated URI is requested explicitly creates whatever ActionForms you want and initializes them with setXXX methods. Then Action A places these form beans into the HTTPRequest object as attributes with the SAME NAME that struts would use for the attribute, i.e. the logical name specified in the action-mapping for the form bean. Then, when subsequent URI's are requested associated with other Actions, if Struts finds that an attribute with the associated (with the particular Action) form bean's logical name already exists, it will use that object rather than instantiating a new one (I'm pretty sure that's how it works). The only drawback is that you would have to make sure that Action A's URI is requested BEFORE the other Actions' URIs, so that your logic will initialize and store the ActionForm beans rather than the Struts framework. whew. I don't know if that helps, but it's the best I could come up with based on what I know about Struts. :) A final consideration: Is is possible that 2 of the 3 beans don't need to be ActionForm beans at all, but just value objects that are created and stored in the session? -Original Message- From: Slimane [mailto:[EMAIL PROTECTED]] Sent: Friday, March 15, 2002 3:49 PM To: Struts Users Mailing List Subject: RE: problem with bean having session scope Hi, Thanx again for your answer :) The problem is that I don't want to nest my ActionForm, I want them all treated as a unique session bean. Without them being into (dependant of) another ActionForm. so you can retrieve them from other Actions/JSPs by using request.getAttribute( ActionForm logical name ). I suppose you meant request.getSession().getAttribute( ActionForm logical name ), didn't you ? :) Friendly Regards, Slimane At 15:12 15/03/2002 -0800, Someone poor demented soul by the name of Joseph Barefoot presented us with the following text which may contain useless information. Valid questions, all. :) I have to admit I'm not 100% sure when the ActionForm bean is first instantiated/initialized, but this is what I think: The ActionForm bean is created and initialized when the URI specified by the action-mapping for this particular Action/ActionForm pair is requested. (if this is incorrect, please someone correct me) If you want to share beans, just declare the scope to be session for the bean in question in the action-mapping for this action inside struts-config.xml. Struts stores these beans as attributes in the HTTPSession object, so you can retrieve them from other Actions/JSPs by using request.getAttribute( ActionForm logical name ). As for the last question, ActionForm beans can appear as fields inside other ActionForms, so you can nest your form beans such that when one gets instantiated, all of the nested form fields get instantiated too. Then you can reference them as nested attributes of the parent ActionForm inside any of your Struts JSP tags. You can also retrieve them from the session in a similar manner: request.getAttribute( ActionForm logical name ).getMyNestedForm() happy coding, Joe -Original Message- From: Slimane [mailto:[EMAIL PROTECTED]] Sent: Friday, March 15, 2002 1:58 PM To: Struts Users Mailing List Subject: RE: problem with bean having session scope Hi, Thanks for your answer, I'll try to remove the jsp:useBean tag. But I still do have a question :) You say that: Struts takes care of instantiating, read/writes, and scope management for these beans well, then when does he do that ? The first time I call the Action Class ? If so, what if I want to share 3 beans ? The first time I'll call one Action Class, only one ActionForm will be instanciated, no ? Friendly Regards, Slimane At 10:03 15/03/2002 -0800, Someone poor demented soul by the name of Joseph Barefoot presented us with the following text which may contain useless information. I suppose the form bean is created the first time I use a jsp:useBean tag in my jsp file, isn't it ? (for example: jsp:useBean id=searchbydateform scope=session class
