Solved with the help of Arron Bates (http://www.keyboardmonkey.com)
Important steps:
[read whole thread for more info]
- Use List setters (instead of more problematic Object[] setters)
public void setMonkeys(List newMonkeys){
this.monkeys = newMonkeys;
}
public List getMonkeys(){
return monkeys;
}
- Use struts-action session scope forms to avoid using LazyLists
Both the action that shows the form and the action that processess it have to have
session scope forms
Daniel
----- Original Message -----
From: "Arron Bates" <[EMAIL PROTECTED]>
To: "Daniel Bl�zquez" <[EMAIL PROTECTED]>
Sent: Thursday, December 04, 2003 12:49 PM
Subject: Re: Fw: [struts-nested] BeanUtils.populate exception
> Daniel,
>
> I don't know the specifics of having a long primitive as the value for Age,
> but what a lot of people do is to have a String property handle the input for
> the application (because it can accept no number values), to which they
> validate is a number before confinuing. One thing I do a fair bit of, is to
> have the String property, but the rest of the application can use a converter
> property. eg:
>
> private String strAge = null;
>
> public String getAge() { return strAge; }
> public void setAge(String newAge) { this.strAge = newAge; }
>
> public long getAgeLong() { return Long.parseLong(strAge); }
>
>
> ...this way, Struts can always set a string with the "age" property, and my
> application can use the handier "getAgeLong" method.
>
>
> Regarding my running monkey examples, they use the session scope. Simply
> because it was more work to hook up a database etc. And, getting the indexes
> working with the session scope was much harder. That is, until enough people
> complained that my example didn't show how to use the request scope for
> nesting beans that I wrote the LazyList/LazyMap utilities. The examples work
> simply because the arrays are always in memory, and Struts is nevery trying to
> populate a zero sized array. Which is what the LazyList prevents, by growing
> to meet the index demand.
>
>
> For your team bean, try setting your monkey's property to this...
>
> public void setMonkeys(List newMonkeys){
> this.monkeys = newMonkeys;
> }
>
> public List getMonkeys(){
> return monkeys;
> }
>
> ...just set and get lists. The latest Struts can handle this no problems, and
> lets the lazy list work its magic. Otherwise you're back to array problems again.
>
> Give that a try and see how it goes.
>
>
> Arron.
>
>
>
> > Arron:
> >
> > First of all, thank you for giving you personal email! ;o
> >
> > > What's the property that it's failing on?... is it the monkeys[i]
> > property?...
> >
> > Yes, it is the monkeys[i] property. If I delete the "age" and the select
> > "size", works fine
> >
> > > Moving to session scope would mean you don't have to use the LazyList. The
> > > LazyList was devised to help people keep beans that use indexed properties out
> > > of the session. But if you've put the beans into the session, then indexed
> > > problems shouldn't happen due to pre-population.
> >
> > Sure!! but i've tried every advice i found in the mail-archive...
> > and every combinatory of those advices ;) How do you do in
> > keyboardmonkey examples for not using LazyLists?
> >
> > > Can you show me the code of the bean for this property?...
> >
> > the involved Form Bean MonkeyTeamForm
> > -----------------------------------------------------
> > public class MonkeyTeamForm extends ValidatorForm implements Serializable{
> >
> > private List monkeys = ListUtils.lazyList(new ArrayList(), new
> > MonkeyFactory()); private String teamName;
> >
> > public void setMonkeys(Object[] newMonkeys){
> >
> > // I tried too to initialize "monkeys" as a lazy list here too
> > for (int i = 0; i < newMonkeys.length; i++){
> > monkeys.add(newMonkeys[i]);
> > }
> > }
> >
> > public Object[] getMonkeys(){
> > return monkeys.toArray();
> > }
> >
> > public void setTeamName(String newTeamName){
> > teamName = newTeamName;
> > }
> >
> > public String getTeamName(){
> > return teamName;
> > }
> >
> > [many more getters and setters that works ok]
> >
> > public void reset(ActionMapping mapping, HttpServletRequest
> > request){ tecnologias = ListUtils.lazyList(new ArrayList(), new
> > MonkeyFactory()); }
> >
> > public void reset(){
> > tecnologias = ListUtils.lazyList(new ArrayList(), new
> > MonkeyFactory()); } }
> > ----------------------------------------------------
> >
> > The monkey class (Monkey Team contains "Monkey"s)
> > ----------------------------------------------------
> > public class Monkey implements Serializable {
> > private String name;
> > private long age; [ITS A PROBLEM TO BE "LONG"?]
> > private String size;
> >
> > public void setTeamName(String newTeamName){
> > teamName = newTeamName;
> > }
> > public String getTeamName(){
> > return teamName;
> > }
> > public void setAge(long newAge){
> > age = newAge;
> > }
> > public long getAge(){
> > return age;
> > }
> > public void setSize(String newSize){
> > size = newSize;
> > }
> >
> > public String getSize(){
> > return size;
> > }
> > }
> > ---------------------------------------------------
> >
> > The jsp form (MonkeyTeamForm) : (very similar to nested-tutorial "monkey
> > with bananas")
> > ----------------------------------------------------
> > <nested:form action="updateTeam">
> > <nested:write property="teamName"/>
> > [many more simple selects and texts boxes]
> >
> > <nested:iterate property="monkeys">
> > <nested:write property="name"/>
> > <nested:text property="age" size="10"/>
> >
> > <nested:select property="size">
> > <nested:options property="../sizesList"/>
> > </nested:select>
> >
> > </nested:iterate> [if I delete "age" and "size" boxes, n.p.]
> >
> > </nested:form>
> > -----------------------------------------------------
> >
> > big-big Thank you
> >
> > Daniel
> >
> > ----- Original Message -----
> > From: "Arron Bates" <[EMAIL PROTECTED]>
> > To: "Daniel Bl�zquez" <[EMAIL PROTECTED]>
> > Sent: Thursday, December 04, 2003 5:02 AM
> > Subject: Re: [struts-nested] BeanUtils.populate exception
> >
> > > Daniel,
> > >
> > > What's the property that it's failing on?... is it the monkeys[i]
> > property?...
> > > Can you show me the code of the bean for this property?...
> > >
> > > Moving to session scope would mean you don't have to use the LazyList. The
> > > LazyList was devised to help people keep beans that use indexed properties
> > out
> > > of the session. But if you've put the beans into the session, then indexed
> > > problems shouldn't happen due to pre-population.
> > >
> > > This problem would still exist even if you used the indexed tags.
> > >
> > >
> > > Arron.
> > >
> > >
> > >
> > > > I have done rigth now a few more things but I still have the problem:
> > > >
> > > > - I have set the scope of the action to "session"
> > > >
> > > > - I have implemented the reset() method, instantiating collectiong
> > > > using a LazyList
> > > >
> > > > Maybe its recommendable to switch to Indexed properties? i only
> > > > wanted to do in the same way as Arron's monkey tree -so simple, and
> > > > cute-...
> > > >
> > > > but nothing works! :(
> > > >
> > > > Any ideas please?
> > > >
> > > > ----- Original Message -----
> > > > From: "Daniel Bl�zquez" <[EMAIL PROTECTED]>
> > > > To: <[EMAIL PROTECTED]>
> > > > Sent: Tuesday, December 02, 2003 5:55 PM
> > > > Subject: [struts-nested] BeanUtils.populate exception
> > > >
> > > > > Hi,
> > > > >
> > > > > I have been dealing with struts-nested taglibs for a few days (with
> > the
> > > > > unestimable help from Arron Bates in http://www.keyboardmonkey.com)
> > and
> > > > with
> > > > > the great amount of messages of this topic in the mailing list. But I
> > > > still
> > > > > have the next problem:
> > > > >
> > > > > javax.servlet.ServletException: BeanUtils.populate
> > > > > at org.apache.struts.util.RequestUtils.populate
> > RequestUtils.java:1254)
> > > > >
> > > > > (no extra info about ArrayIndexOutOfBounds or a more detailed
> > exception)
> > > > >
> > > > > when submitting a form that uses a nested collection of objects. Each
> > > > object
> > > > > is showing in the form a <select> and a <input text> box (as a form
> > > > showing
> > > > > monkeys, each monkey with a box for age and a <select> for size).
> > > > >
> > > > > <nested.form action="xxxx">
> > > > >
> > > > > <nested:iterate property="monkeys">
> > > > >
> > > > > <nested:write property="name"/>
> > > > > <nested:text property="age" size="10"/>
> > > > > <nested:select property="size">
> > > > > <nested:options property="../sizesList"/>
> > > > > </nested:select>
> > > > >
> > > > > </nested:iterate>
> > > > >
> > > > > </nested.form>
> > > > >
> > > > > The form also has many more properties (including checkboxes and
> > simple
> > > > > selects) but these ones work correctly.
> > > > >
> > > > > Things I have already done:
> > > > >
> > > > > -- Initialize involved property according to thread
> > > > >
> > > >
> > http://nagoya.apache.org/eyebrowse/[EMAIL PROTECTED]
> > > > > pache.org&by=thread&from=240019
> > > > > (thanks Arron again and Brandon)
> > > > >
> > > > > -- provide setter in the form for the nested property with the
> > signature:
> > > > > public void setMonkeys(Object[] newMonkeys)
> > > > >
> > > > > -- provide setter in nested monkey object for the size
> > > > > public void setSize(String newSize)
> > > > >
> > > > > I am really frustated because 'cant see what I am doing wrong!, any
> > help
> > > > > will be very appreciated
> > > > >
> > > > > TIA,
> > > > > Daniel
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