hi everybody! great flamewar ;>) thanks to everybody involved! i really appreciate your help! you enlightened my greyish days! cheers martin
---------- Urspruengliche Nachricht ------------------------------ Von: "Arron Bates" <[EMAIL PROTECTED]> Antworten an: "Struts Users Mailing List" <[EMAIL PROTECTED]> Datum: Wed, 21 Jan 2004 04:11:40 +1000 >Never thought I'd see a flamewar on nested beans. :) > >Request scope beans in lists are very much possible with the help of "Lazy" >collections... > > http://marc.theaimsgroup.com/?l=struts-user&m=105027737732711&w=2 > >...it's the entire reason the lazy collections were made. Some people just >can't live with computer memory filling up with session objects. > >The lazy solution keeps Struts happy by allowing an empty list to recieve >updates on indexes not there yet (which is what happens when the form object >is created for the first time when the request comes in). > >That said, nothing in life comes free. Nested beans in request scope is one >degree harder to code for than form beans in the session. If a site has >limited concurrent users (intranetty, etc etc), I vote to put the form in the >session every time. :) ...but the other way is more than possible. > > >Cheers. > >Arron. > > > >> I did not get your question clearly. >> >> When a new form(instance of ActionForm) is created, users input is >> not lost.The users input is still in the request Object.(Are you >> confusing the Form on screen with the ActionFOrm object on server >> side?).So after the instance of ActionForm is created, it is >> populated with the parameters from the request using the struts auto- >> population mechanism.And then you can use the same BeanList to pass >> to the Service layer(But after conversion may be as all the >> properties in String format.SO create DTO bean from correspondign >> stringbeans). >> >> Hope this helps. >> regards, >> Shirish >> >> -----Original Message----- >> From: Martin Sturzenegger [mailto:[EMAIL PROTECTED] >> Sent: Tuesday, January 20, 2004 3:11 PM >> To: [EMAIL PROTECTED]; Struts Users Mailing List >> Subject: RE: getting data from form with nested beans >> >> hi shirish, >> great conceipt and many thanks for example and explanation, my fog >> seems to thin out slowly. one question remains: as soon as a new >> form is created, then, i assume, the user's inputs are lost. so how >> do you get hold of the user's input? usually one feeds the input >> data back into a database. with simple beans i copy the formdata to >> a new instantiated dto-bean within my action class and pass the dto- >> bean to my business-layer. but dealing with nested beans, where and how? >> sorry for pestering >> and thanks a lot in advance >> martin >> >> ---------- Urspruengliche Nachricht ------------------------------ >> Von: <[EMAIL PROTECTED]> >> Antworten an: "Struts Users Mailing List" <[EMAIL PROTECTED]> >> Datum: Tue, 20 Jan 2004 13:54:30 +0100 >> >> >yes:-)) >> >And I am sure most of the people do have the same.I mean tieing the nested >properties to the session scope does take away a lot of flexibility. >> > >> >Anyhow just try my sample code...It should demonstrate the concept. >> > >> >regards, >> >Shirish >> > >> >-----Original Message----- >> >From: Mark Lowe [mailto:[EMAIL PROTECTED] >> >Sent: Tuesday, January 20, 2004 1:44 PM >> >To: Struts Users Mailing List >> >Subject: Re: getting data from form with nested beans >> > >> > >> >So you've had forms, with indexed properties with dynamic sizes working >> >when scoping to request? >> > >> > >> >On 20 Jan 2004, at 11:45, <[EMAIL PROTECTED]> wrote: >> > >> >> Hi, >> >> Is it flaming or what?I thought we were trying to solve each others >> >> problems.Still a last try. >> >> We have a complete application(3 modules/4000 classes/15 companies >> >> live as of date) which uses all form beans just in request scope.And >> >> all over the place we have used form beans in request scope.And the >> >> application is well and running. >> >> >> >> If you go t through my mail, you will understand why it will mail.SO >> >> please read the mail carefully. >> >> I will try to explain it again. >> >> >> >> When the form is submitted(the user presses submit button on >> >> screen),the corresponding action will be called by struts.At the same >> >> time, it will look for a actionForm from the mapping.As the scope is >> >> specified as request, a new form will be created.And if you have >> >> looked at my example carefully, you will see that the nested bean list >> >> is created when the form is created.But this nested list is empty.Now >> >> when struts autopopulation tries to populate a nested bean, it should >> >> find that the nested bean list is empty.But the lazy initialization >> >> mechanism in the indexed getter will take care that the list has >> >> enough of beans.See the code below. >> >> ****************33 >> >> //give indexed access to the beans >> >>>>> >> >>>>> public Employee getEmployee(int index){ >> >>>>> >> >>>>> //very imp >> >>>>> >> >>>>> //when a jsp is submited , then while auto populating the form,this >> >>>>> will >> >>>>> ensure >> >>>>> that >> >>>>> >> >>>>> // the form is populated properly. >> >>>>> >> >>>>> while(index >= beanList.size()){ >> >>>>> >> >>>>> beanList.add(new Employee()); >> >>>>> >> >>>>> } >> >> *************************************** >> >> >> >> And as explained in jsp part, as long as the property references are >> >> created properly, this will work.And with struts1.1 nested tags, you >> >> don't have to even use the script<%%> to create property is jsp. >> >> >> >> Hope this clarifies it.If not, try to run my example code. >> >> >> >> regards, >> >> Shirish >> >> >> >> -----Original Message----- >> >> From: Mark Lowe [mailto:[EMAIL PROTECTED] >> >> Sent: Tuesday, January 20, 2004 12:28 PM >> >> To: Struts Users Mailing List >> >> Subject: Re: getting data from form with nested beans >> >> >> >> >> >> Oh yeah .. by working i mean when you submit.. >> >> >> >> >> >> On 20 Jan 2004, at 11:25, Mark Lowe wrote: >> >> >> >>> .. Show us all an example of a form with a dynamic size for a form >> >>> property thats scoped to the request then big shot.. >> >>> >> >>> Come on lets see it!!! >> >>> >> >>> >> >>> On 20 Jan 2004, at 10:45, <[EMAIL PROTECTED]> wrote: >> >>> >> >>>> The scope of form has nothing to do with usage of nested beans.And >> >>>> using session scope shoudl be avaided as far as possible as teh form >> >>>> will stay in session till it is explicitely removed from there.. >> >>>> >> >>>> The <% %> business is for the scripts so that the nested property >> >>>> reference can be created.But with struts1.1 , with the usage of >> >>>> nested tags, oyu can get rid of that scriptlet code.See nested tags >> >>>> for how to do that.I have myself never used nested tags. >> >>>> >> >>>> >> >>>> -----Original Message----- >> >>>> From: Mark Lowe [mailto:[EMAIL PROTECTED] >> >>>> Sent: Tuesday, January 20, 2004 11:05 AM >> >>>> To: Struts Users Mailing List >> >>>> Subject: Re: getting data from form with nested beans >> >>>> >> >>>> >> >>>> What's with all the <% %> business? Things to watch out for, method >> >>>> names and the object cast to the jsp need to match names (e.g. >> >>>> foo.getEmployee() and ${foo.employee}). The form must be scoped to >> >>>> session if you are dynamically changing the size of the indexed >> >>>> property. >> >>>> >> >>>> <html:text name="bean" property="property" indexed="true" /> >> >>>> >> >>>> A better example would be a form bean with a getEmployees() method >> >>>> and >> >>>> a setEmployee rather than getBeanList or whatever it was. >> >>>> >> >>>> >> >>>> public Object[] getEmployees() { >> >>>> return emplyeeList.toArray(); >> >>>> } >> >>>> >> >>>> public void setEmployees(ArrayList employeeList) { >> >>>> this.employeeList = employeeList; >> >>>> } >> >>>> >> >>>> public Employee getEmployee(int i) { >> >>>> return (Employee) employeeList.get(i); >> >>>> } >> >>>> >> >>>> public void setEmployee(int i,Employee employee) { >> >>>> this.employeeList.add(i,employee); >> >>>> } >> >>>> >> >>>> >> >>>> .. >> >>>> >> >>>> public class Employee { >> >>>> private String name; >> >>>> >> >>>> public String getName() { >> >>>> return name; >> >>>> } >> >>>> etc >> >>>> } >> >>>> >> >>>> .. >> >>>> >> >>>> <logic:iterate id="employee" name="employeeForm" >> >>>> property="employees"> >> >>>> >> >>>> <html:"text name="employee" property="name" indexed="true" /> >> >>>> >> >>>> </logic:iterate> >> >>>> >> >>>> or >> >>>> >> >>>> <c:forEach var="employee" items="${employeeForm.employees}"> >> >>>> .. >> >>>> >> >>>> >> >>>> >> >>>> On 20 Jan 2004, at 08:56, <[EMAIL PROTECTED]> wrote: >> >>>> >> >>>>> I am resending my earlier mail on this user list..Go through the >> >>>>> sample code >> >>>>> and >> >>>>> ask me if u don't understand something. >> >>>>> >> >>>>> The important portions are commented.Especially look at the jsps >> >>>>> property >> >>>>> how >> >>>>> it is set and also the form bean.The property syntax I have used was >> >>>>> for struts 1.0 ..But with struts 1.1 , you can have a better cleaner >> >>>>> syntax using nested tags.But I have not used it...This works for 1.1 >> >>>>> as well.. >> >>>>> >> >>>>> ******************************************************** >> >>>>> >> >>>>> //Form Class >> >>>>> >> >>>>> import java.util.ArrayList; >> >>>>> >> >>>>> import java.util.List; >> >>>>> >> >>>>> import org.apache.struts.action.ActionForm; >> >>>>> >> >>>>> public class ExampleListForm extends ActionForm { >> >>>>> >> >>>>> //A list of Emp beans >> >>>>> >> >>>>> private List beanList = new ArrayList(); >> >>>>> >> >>>>> public List getBeanList(){ >> >>>>> >> >>>>> return beanList; >> >>>>> >> >>>>> } >> >>>>> >> >>>>> public void setBeanList(List list){ >> >>>>> >> >>>>> beanList = list; >> >>>>> >> >>>>> } >> >>>>> >> >>>>> //very imp. >> >>>>> >> >>>>> //give indexed access to the beans >> >>>>> >> >>>>> public Employee getEmployee(int index){ >> >>>>> >> >>>>> //very imp >> >>>>> >> >>>>> //when a jsp is submited , then while auto populating the form,this >> >>>>> will >> >>>>> ensure >> >>>>> that >> >>>>> >> >>>>> // the form is populated properly. >> >>>>> >> >>>>> while(index >= beanList.size()){ >> >>>>> >> >>>>> beanList.add(new Employee()); >> >>>>> >> >>>>> } >> >>>>> >> >>>>> return (Employee)beanList.get(index); >> >>>>> >> >>>>> } >> >>>>> >> >>>>> public void setEmployee(int index,Employee emp){ >> >>>>> >> >>>>> beanList.set(index,emp); >> >>>>> >> >>>>> } >> >>>>> >> >>>>> } >> >>>>> >> >>>>> *********************************************** >> >>>>> >> >>>>> Bean class >> >>>>> >> >>>>> public class Employee { >> >>>>> >> >>>>> private String name; >> >>>>> >> >>>>> private String salary; >> >>>>> >> >>>>> /** >> >>>>> >> >>>>> * Returns the name. >> >>>>> >> >>>>> * @return String >> >>>>> >> >>>>> */ >> >>>>> >> >>>>> public String getName() { >> >>>>> >> >>>>> return name; >> >>>>> >> >>>>> } >> >>>>> >> >>>>> /** >> >>>>> >> >>>>> * Returns the salary. >> >>>>> >> >>>>> * @return String >> >>>>> >> >>>>> */ >> >>>>> >> >>>>> public String getSalary() { >> >>>>> >> >>>>> return salary; >> >>>>> >> >>>>> } >> >>>>> >> >>>>> /** >> >>>>> >> >>>>> * Sets the name. >> >>>>> >> >>>>> * @param name The name to set >> >>>>> >> >>>>> */ >> >>>>> >> >>>>> public void setName(String name) { >> >>>>> >> >>>>> this.name = name; >> >>>>> >> >>>>> } >> >>>>> >> >>>>> /** >> >>>>> >> >>>>> * Sets the salary. >> >>>>> >> >>>>> * @param salary The salary to set >> >>>>> >> >>>>> */ >> >>>>> >> >>>>> public void setSalary(String salary) { >> >>>>> >> >>>>> this.salary = salary; >> >>>>> >> >>>>> } >> >>>>> >> >>>>> } >> >>>>> >> >>>>> **************************************** >> >>>>> >> >>>>> JSP >> >>>>> >> >>>>> <%@ page language="java"%> >> >>>>> >> >>>>> <%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %> >> >>>>> >> >>>>> <html:html> >> >>>>> >> >>>>> <html:form action="/" > >> >>>>> >> >>>>> <logic:iterate id="bean" name="exampleListForm" property="beanList" >> >>>>> indexId="i"/> >> >>>>> >> >>>>> <html:text name="exampleListForm" property="<%=\"employee[\" + i >> >>>>> \"].name\"%>"> >> >>>>> >> >>>>> <html:text name="exampleListForm" property="<%=\"employee[\" + i >> >>>>> \"].salary\"%>"> >> >>>>> >> >>>>> </logic:iterate> >> >>>>> >> >>>>> </html:form> >> >>>>> >> >>>>> </html:html> >> >>>>> >> >>>>> Explanation: >> >>>>> >> >>>>> See how the property is constructed. >> >>>>> >> >>>>> <html:text name="exampleListForm" property="<%=\"employee[\" + i >> >>>>> \"].name\"%>"> >> >>>>> >> >>>>> So this will result in a parameter name employee[i].name in the http >> >>>>> request.So >> >>>>> when the jsp is rendered, this will be interpreted as >> >>>>> >> >>>>> getEmployee[i].getName().And when the jsp is submitted , the same >> >>>>> will >> >>>>> be >> >>>>> interpreted as getEmployee[i].setName().And this will result in auto >> >>>>> population >> >>>>> of data in the form as u can see. >> >>>>> >> >>>>> So check the indexed properties on the form as well.(Especially the >> >>>>> getEmployee(index i) proeprty with while loop.) >> >>>>> >> >>>>> Hope this helps. >> >>>>> >> >>>>> >> >>>>> >> >>>>> regards, >> >>>>> >> >>>>> Shirish. >> >>>>> >> >>>>> >> >>>>> -----Original Message----- >> >>>>> From: Mark Lowe [mailto:[EMAIL PROTECTED] >> >>>>> Sent: Monday, January 19, 2004 6:18 PM >> >>>>> To: Struts Users Mailing List >> >>>>> Subject: Re: getting data from form with nested beans >> >>>>> >> >>>>> >> >>>>> Dunno what that thread on lazy lists was but nesting beans should >> >>>>> work >> >>>>> fine, but you will need to scope any property that you want a >> >>>>> dynamic >> >>>>> size to session. >> >>>>> >> >>>>> Shouldn't be anymore complicated than that. >> >>>>> >> >>>>> >> >>>>> On 19 Jan 2004, at 16:01, Martin Sturzenegger wrote: >> >>>>> >> >>>>>> hi, >> >>>>>> concerning nested properties, i found so many questions, hints etc. >> >>>>>> in >> >>>>>> the archive but nothing that really helped all the way...i'm still >> >>>>>> confused (or even more now...) >> >>>>>> i still don't understand how struts handles input from a form that >> >>>>>> holds an iteration of nested beans. >> >>>>>> is the following correct? >> >>>>>> as soon as the user submits the form, the actionform-bean, holding >> >>>>>> the >> >>>>>> nested beans with the user's changes, gets transmitted. >> >>>>>> is it so, that before the action-class is called, the form-bean's >> >>>>>> reset() method is called, and all nested beans are set to null by >> >>>>>> default? >> >>>>>> so do i have to override the reset() method? >> >>>>>> what do i iterate over in the reset() method to get the user's >> >>>>>> inputs? >> >>>>>> how do i limit the iteration? >> >>>>>> does the validate() method gets called before the reset method?. >> >>>>>> >> >>>>>> i've seen examples, where a dto-class is instanciated within the >> >>>>>> reset() method. >> >>>>>> is this the way to do it? >> >>>>>> do i have to access these dto-beans in the action class? >> >>>>>> >> >>>>>> could somebody give me a little example of a reset()-method, just >> >>>>>> to >> >>>>>> show how the user's input can be gathered and then stored away? >> >>>>>> >> >>>>>> and.. what are lazy lists? i wasn't able to find a definition.... >> >>>>>> >> >>>>>> sorry about it but >> >>>>>> >> >>>>>> regards from an utterly confused martin >> >>>>>> >> >>>>>> >> >>>>>> >> >>>>>> >> >>>>>> ---------- Urspruengliche Nachricht ------------------------------ >> >>>>>> Von: <[EMAIL PROTECTED]> >> >>>>>> Datum: Mon, 19 Jan 2004 10:52:10 +0100 >> >>>>>> >> >>>>>>> You ahve a fixed length or Empty list in the form.So when the auto >> >>>>>>> population tries to populate the nested bean for the list which is >> >>>>>>> empty/fixed size,you get this exception. >> >>>>>>> Try to use lazy list or search the archive for nested property >> >>>>>>> usage...There are many examples which will demonatrate how to use >> >>>>>>> it. >> >>>>>>> >> >>>>>>> HTH. >> >>>>>>> regards, >> >>>>>>> Shirish >> >>>>>>> >> >>>>>>> -----Original Message----- >> >>>>>>> From: Martin Sturzenegger >> >>>>>>> [mailto:[EMAIL PROTECTED] >> >>>>>>> Sent: Monday, January 19, 2004 10:46 AM >> >>>>>>> To: Struts Users Mailing List; [EMAIL PROTECTED]; Struts >> >>>>>>> Users >> >>>>>>> Mailing List >> >>>>>>> Subject: Re: Including one JSP in another >> >>>>>>> >> >>>>>>> >> >>>>>>> i try to receive user-input from a form using a list of nested >> >>>>>>> beans. >> >>>>>>> after hitting submit i get an ArrayIndexOutOfBoundsException >> >>>>>>> can somebody give me a hint? >> >>>>>>> many thanks >> >>>>>>> martin >> >>>>>>> >> >>>>>>> >> >>>>>>> >> >>>>>>> >> >>>>>>> stacktrace: >> >>>>>>> >> >>>>>>> java.lang.ArrayIndexOutOfBoundsException >> >>>>>>> java.lang.reflect.Array.get(Native Method) >> >>>>>>> >> >>>>>>> org.apache.commons.beanutils.PropertyUtils.getIndexedProperty(Prop >> >>>>>>> e >> >>>>>>> rt >> >>>>>>> y >> >>>>>>> Utils.java:525) >> >>>>>>> >> >>>>>>> org.apache.commons.beanutils.PropertyUtils.getIndexedProperty(Prop >> >>>>>>> e >> >>>>>>> rt >> >>>>>>> y >> >>>>>>> Utils.java:428) >> >>>>>>> >> >>>>>>> org.apache.commons.beanutils.PropertyUtils.getNestedProperty(Prope >> >>>>>>> r >> >>>>>>> ty >> >>>>>>> U >> >>>>>>> tils.java:770) >> >>>>>>> >> >>>>>>> org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUti >> >>>>>>> l >> >>>>>>> s. >> >>>>>>> j >> >>>>>>> ava:801) >> >>>>>>> >> >>>>>>> org.apache.commons.beanutils.BeanUtils.setProperty(BeanUtils.java: >> >>>>>>> 881) >> >>>>>>> org.apache.commons.beanutils.BeanUtils.populate(BeanUtils.java: >> >>>>>>> 808) >> >>>>>>> org.apache.struts.util.RequestUtils.populate(RequestUtils.java: >> >>>>>>> 1252) >> >>>>>>> >> >>>>>>> org.apache.struts.action.RequestProcessor.processPopulate(RequestP >> >>>>>>> r >> >>>>>>> oc >> >>>>>>> e >> >>>>>>> ssor.java:821) >> >>>>>>> >> >>>>>>> org.apache.struts.action.RequestProcessor.process(RequestProcessor >> >>>>>>> . >> >>>>>>> ja >> >>>>>>> v >> >>>>>>> a:254) >> >>>>>>> >> >>>>>>> org.apache.struts.action.ActionServlet.process(ActionServlet.java: >> >>>>>>> 1482) >> >>>>>>> org.apache.struts.action.ActionServlet.doPost(ActionServlet.java: >> >>>>>>> 525) >> >>>>>>> javax.servlet.http.HttpServlet.service(HttpServlet.java:763) >> >>>>>>> javax.servlet.http.HttpServlet.service(HttpServlet.java:856) >> >>>>>>> >> >>>>>>> >> >>>>>>> >> >>>>>>> >> >>>>>>>>>>> >> >>>>>>>>>>> Confidentiality Notice >> >>>>>>>>>>> >> >>>>>>>>>>> The information contained in this electronic message and any >> >>>>>>>> attachments >> >>>>>>>>>>> to this message are intended >> >>>>>>>>>>> for the exclusive use of the addressee(s) and may contain >> >>>>>>>>>>> confidential >> >>>>>>>>>>> or privileged information. 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