Leo, I don't know if this will help, but we experienced a similar issue. I do believe you are right: it is an artifact of a Request scoped ActionForm. Our solution was to modify the indexed getters and setters so that they automatically sized the the internal array list representation upon request. This approach eliminated the IndexOutOfBoundsError on submit of our form.
> -----Original Message----- > From: Leonardo Maciel [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, November 19, 2002 12:18 PM > To: [EMAIL PROTECTED] > Subject: RE: Re: struggling with indexed/repeating input fields > > > > I wish I had another solution to the problem. > > I am using ArrayList and it is initialized on IndexedAction (see attached) > ========= > for ( int i=0; i<10; i++ ) { > NameValue nv = new NameValue( "" ,new Integer(i) ); > al.add( nv ); > } > ========= > > The values show on the page. But when you submit the form, the ArrayList > vanish. > Where is the ArrayList size 10 initialize ? > > The exception happens on BeanUtils.populate before execute the submit > action. > > If you can make the code attached work with scope="request" I will be > surprised > > Please take a look in the code before suggested what is already > implemented. > > Thank you, > Leo > > > >From: [EMAIL PROTECTED] > >Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]> > >To: [EMAIL PROTECTED] > >Subject: RE: Re: struggling with indexed/repeating input fields > >Date: Tue, 19 Nov 2002 17:52:52 +0100 > > > >HI, > >I think u are suggesting that every form has to be in session > scope which > >is > >dangerous and will unnecessarily clog the session object. > > > >If u have problems when calling setters on u r form because the list on > >form is > >smaller, i will suggest following approach. > > > >public class MyForm { > > private List objectList = new ArrayList(); > >//use arrayList instead of array as it does not force u to declare size > > public Object getObject(index i){ > > while(index >= this.getList().size() ){ > > this.getList().add(new Object()); > > } > > return this.getList().getObject(index); > > } > >} > > > >So in this case, when the setter is called,the form will be > added with bean > >first nd then the setter will be called. > >Try this approach and let me know. > > > >Regards, > >Shirish > > > >-----Original Message----- > >From: leomaciel [mailto:[EMAIL PROTECTED]] > >Sent: Tuesday, November 19, 2002 5:43 PM > >To: struts-user > >Cc: leomaciel > >Subject: Re: struggling with indexed/repeating input fields > > > > > > > >I GOT IT! > > > >I forgot to send the struts-config.xml and there were the difference > > > ><VERY-IMPORTANT> > >if I set the action scope="request" I get: > >javax.servlet.ServletException: BeanUtils.populate > >... > >Caused by: java.lang.IndexOutOfBoundsException: Index: 2, Size: 0 > >or > >Caused by: java.lang.NullPointerException > > > >make sure you don't have scope="request" in your <action ... </action> > ></VERY-IMPORTANT> > > > > > >======= my struts-config.xml ======= > ><form-beans> > > ... > > <form-bean name="IndexedForm" type="test.IndexedForm" /> > > <form-bean name="ParametersForm" type="test.ParametersForm" /> > ></form-beans> > >... > ><action path="/indexed" > > type="test.IndexedAction" > > name="IndexedForm" > > validate="false" > > > > > <forward name="success" path="/indexed.jsp"/> > ></action> > > > ><action path="/indexedResult" > > type="test.IndexedResultAction" > > name="IndexedForm" > > validate="false" > > > > > <forward name="success" path="/indexedResult.jsp"/> > ></action> > > > ><action > > path="/ShowParameters" > > type="test.ShowParametersAction" > > name="ParametersForm" > > validate="false" > > > > > <forward name="success" path="/parameters.jsp" /> > ></action> > > > ><!-- Save parameters --> > ><action > > path="/SaveParameters" > > type="test.SaveParametersAction" > > name="ParametersForm" > > validate="false" > > > > > <forward name="success" path="/indextest.jsp" /> > ></action> > >=================================== > >Try it out. > > > >Cheers, > >Leo > > > > > > > > >From: "Leonardo Maciel" <[EMAIL PROTECTED]> > > >Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]> > > >To: [EMAIL PROTECTED] > > >Subject: Re: struggling with indexed/repeating input fields > > >Date: Tue, 19 Nov 2002 15:33:04 +0000 > > > > > >Kevin, > > > > > >I finally got > > ><logic:iterate ... <html:text ... indexed="true"/> ... </logic:iterate> > > >to work. > > > > > >The sample code came from > > > >http://www.mail-archive.com/[email protected]/msg12084.html > > >Thank you Dave. > > > > > >I built Dave's code on top of struts-example. All necessary code is > > >attached. > > >On the index.jsp page there are two links > > > > > ><html:link page="/indexed.do">Iterate html:text indexed > >example</html:link> > > > > > ><html:link page="/ShowParameters.do">From Dave Iterate > html:text indexed > > >example</html:link> > > > > > >The first one, indexed.do, doesn't work. Gives > IndexOutOfBoundException. > > >The second, ShowParameters.do, works. :D > > > > > >I still trying to figure out the differences between those two... > > > > > >Good luck! > > >Leo > > > > > > > > > > > >>From: Kevin HaleBoyes <[EMAIL PROTECTED]> > > >>Reply-To: "Struts Users Mailing List" <[EMAIL PROTECTED]> > > >>To: [EMAIL PROTECTED] > > >>Subject: struggling with indexed/repeating input fields > > >>Date: Tue, 19 Nov 2002 07:10:15 -0800 (PST) > > >> > > >>I've asked this question several times on this mailing list but > > >>I've never received an answer that would help. I've dug a bit > > >>deeper and understand more about the problem but I'm still really > > >>struggling with indexed/repeating input fields so I thought I'd > > >>ask again. I'm starting to wonder if it is possible. > > >> > > >>In my ActionForm I have an array property that is initialized to > > >>null (I don't know the values until the Action executes). > > >>I have a getter > > >>that returns the entire array and a setter that takes an array. > > >>I also have indexed getters and setters. The array is of another > > >>class (that simply has two strings in it with the default/empty > > >>constructor and getters and setters). > > >> > > >>In my (edit) action I construct an array and call the setter in the > > >>action form instance (that I just created). I then forward to a JSP > > >>page that has a <logic:iterate> tag and <html:text> tags all within > > >>a form tag. The form has a <html:submit> that calls my save action. > > >>The save action simply forwards to a "confirmation" JSP page that > > >>has a similar iteration to display the input values. > > >> > > >>The initial "edit" form gets displayed properly - the expected > > >>number of iterations are performed and the expected values of the > > >>input fields is shown. When I press the submit button things break. > > >>I know that isn't terribly descriptive but "how" it breaks depends > > >>on how I form the <html:text> tags - there are two cases that I've > > >>tried. > > >> > > >>In the first case, I use the following in the "edit" JSP form: > > >> > > >><logic:iterate id="li" name="IndexedForm" property="lineItem"> > > >> <html:text name="li" property="itemNo" indexed="true"/> > > >> <html:text name="li" property="desc" indexed="true"/> > > >></logic:iterate> > > >> > > >>As I said, it displays properly. I change the "desc" text and hit > > >>the submit button and end up getting an exception: > > >> > > >> ApplicationDispatcher[/cml] Servlet.service() for servlet > > >> jsp threw exception > > >> org.apache.jasper.JasperException: No collection found > > >> > > >>In the "save" action I printed the toString() of the input form > > >>before forwarding to the JSP page and can see that the array is > > >>in fact null. Why is it null? Who is responsible for instantiating > > >>an array for that field - struts or the application? If it is the > > >>application, how can it know how big to make the array? > > >> > > >> > > >>In the second case, I use the following in the "edit" JSP form: > > >> > > >><logic:iterate id="li" name="IndexedForm" > > >> property="lineItem" indexId="i"> > > >> <% String prop1 = "lineItem[" + i + "].itemNo"; %> > > >> <html:text property="<%= prop1 %>" size="30"/> > > >> <% String prop2 = "lineItem[" + i + "].desc"; %> > > >> <html:text property="<%= prop2 %>" size="30"/> > > >></logic:iterate> > > >> > > >>Again, it displays properly. I change the "desc" text and hit the > > >>submit button and end up getting an exception: > > >> > > >>StandardWrapperValve[action]: Servlet.service() for > > >> servlet action threw exception > > >>javax.servlet.ServletException: BeanUtils.populate > > >>... > > >>Caused by: java.lang.NullPointerException > > >> at > > >>com.illuminat.cml.IndexedForm.getLineItem(IndexedForm.java:286) > > >> > > >> > > >>This happens even before it calls the "save" action. > > >> > > >> > > >>So, I'm at a loss as to how to handle indexed or repeating fields. > > >>I've looked at the code in html-setters.jsp and TestBean from the > > >>exercise-taglib in the distribution but that uses fixed size > > >>arrays and static initializers. It hasn't been simple to go from > > >>that to a variable number of array elements and non-static > > >>(from a database) initialization. > > >> > > >>I've also looked in the archives and > > >>on the current mailing list and found nothing. Actually, I've been > > >>seeing more questions regarding indexed properties lately > > >>(mostly using > > >>DynaBeans) but they are generally going un-answered or not coming > > >>up with solutions, just more questions. This is not a complaint > > >>as I know everyone is very busy but it does mean that I've not found > > >>anything in the archives. > > >> > > >>Help would be most appreciated. Sample code would be even nicer! > > >>Is it even possible with Struts (version 1.1b2)? > > >>I can furnish code or a better explaination if needed. > > >> > > >>Kevin > > >> > > >> > > >> > > >> > > >>__________________________________________________ > > >>Do you Yahoo!? > > >>Yahoo! Web Hosting - Let the expert host your site > > >>http://webhosting.yahoo.com > > >> > > >>-- > > >>To unsubscribe, e-mail: > > >><mailto:[EMAIL PROTECTED]> > > >>For additional commands, e-mail: > > >><mailto:[EMAIL PROTECTED]> > > > > > > > > >_________________________________________________________________ > > >STOP MORE SPAM with the new MSN 8 and get 2 months FREE* > > >http://join.msn.com/?page=features/junkmail > > ><< works.zip >> > > >-- > > >To unsubscribe, e-mail: > > ><mailto:[EMAIL PROTECTED]> > > >For additional commands, e-mail: > > ><mailto:[EMAIL PROTECTED]> > > > > > >_________________________________________________________________ > >Help STOP SPAM with the new MSN 8 and get 2 months FREE* > >http://join.msn.com/?page=features/junkmail > > > > > >-- > >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]> > > > _________________________________________________________________ > STOP MORE SPAM with the new MSN 8 and get 2 months FREE* > http://join.msn.com/?page=features/junkmail > -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
