RE: again ArrayList and javax.servlet.ServletException: BeanUtils .populate exception

[th...@agilent.com]

Hi,

I think the problem is that your <html:select...> and <html:options...> tags both reference the "folders" property. Judging by your code, the <html:options...> tag is doing what you expect i.e. getting the list of folders the user can select from. However, your <html:select...> tag is telling Struts to try to assign the selected folder back to the form bean by calling setFolders (albeit indirectly via BeanUtils.populate), but setFolders is expecting an ArrayList rather than  a single item from a list which your submit is sending back as a String.

I suspect what you need to do is introduce an additional property called e.g. selectedFolder into your form bean. Your jsp would then look like this:

   <html:select property="selectedFolder" multiple="true">
     <html:options property="folders"/>
   </html:select>

...and you will need corresponding setter and getter methods in the bean. You can then also have getSelectedFolder() return a default value.

Regards,
Thorsten

> Hi,
>   I'm looking for any hint or advice. I've got code like this 
> on my jsp 
> page:
> 
>   <html:select property="folders" multiple="true">
>     <html:options property="folders"/>
>   </html:select>
> 
> property "folders" is a property of my "ModulePathForm" bean:
> 
> /* ModulePathForm.java */
> public class ModulePathForm extends ActionForm{
> 
>     private ArrayList folders;
> 
>     public ModulePathForm() {
>         super();
>         folders = new ArrayList();
>     }
> 
>     public ArrayList getFolders() {
>         return this.folders;
>     }
>    
>     public void setFolders(ArrayList folders) {
>         this.folders = folders;
>     }
> }
> 
> the values from the bean are shown, but when I click Submit, 
> I get this 
> exception:
> 
> javax.servlet.ServletException: BeanUtils.populate
> 	at 
> org.apache.struts.util.RequestUtils.populate(RequestUtils.java:774)
> 	at 
> org.apache.struts.action.ActionServlet.processPopulate(ActionS
> ervlet.java:2061)
> 	at 
> org.apache.struts.action.ActionServlet.process(ActionServlet.j
> ava:1563)
> 	at 
> org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:509)
> 
> .....
> root cause:
> 
> java.lang.IllegalArgumentException: argument type mismatch

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Re: again ArrayList and javax.servlet.ServletException: BeanUtils .populate exception

[Martin Grebac <ma...@sun.com>]

  No, it doesn't work also. I get the same exception everytime.

  I want to have the possibility to select multiple folders, so I did 
what you suggested: added property selectedFolders of type String[], so 
I added this code to my ModulePathForm:

    private String[] selectedFolders;

    public String getSelectedFolders(int index) {
        return this.selectedFolders[index];
    }
   
    public String[] getSelectedFolders() {
        return this.selectedFolders;
    }
   
    public void setSelectedFolders(int index, String selectedFolders) {
        this.selectedFolders[index] = selectedFolders;
    }
   
    public void setSelectedFolders(String[] selectedFolders) {
        this.selectedFolders = selectedFolders;
    }

and the jsp page looks the same as you wrote:

   <html:select property="selectedFolders" multiple="true">
      <html:options property="folders"/>
   </html:select>

 I really don't know where is the problem. Really appreciate any other 
hints.
 
 Thanks,
  Martin



thorsten_soebirk@agilent.com wrote:

>Hi,
>
>I think the problem is that your <html:select...> and <html:options...> tags both reference the "folders" property. Judging by your code, the <html:options...> tag is doing what you expect i.e. getting the list of folders the user can select from. However, your <html:select...> tag is telling Struts to try to assign the selected folder back to the form bean by calling setFolders (albeit indirectly via BeanUtils.populate), but setFolders is expecting an ArrayList rather than  a single item from a list which your submit is sending back as a String.
>
>I suspect what you need to do is introduce an additional property called e.g. selectedFolder into your form bean. Your jsp would then look like this:
>
>   <html:select property="selectedFolder" multiple="true">
>     <html:options property="folders"/>
>   </html:select>
>
>...and you will need corresponding setter and getter methods in the bean. You can then also have getSelectedFolder() return a default value.
>
>Regards,
>Thorsten
>
>  
>
>>Hi,
>>  I'm looking for any hint or advice. I've got code like this 
>>on my jsp 
>>page:
>>
>>  <html:select property="folders" multiple="true">
>>    <html:options property="folders"/>
>>  </html:select>
>>
>>property "folders" is a property of my "ModulePathForm" bean:
>>
>>/* ModulePathForm.java */
>>public class ModulePathForm extends ActionForm{
>>
>>    private ArrayList folders;
>>
>>    public ModulePathForm() {
>>        super();
>>        folders = new ArrayList();
>>    }
>>
>>    public ArrayList getFolders() {
>>        return this.folders;
>>    }
>>   
>>    public void setFolders(ArrayList folders) {
>>        this.folders = folders;
>>    }
>>}
>>
>>the values from the bean are shown, but when I click Submit, 
>>I get this 
>>exception:
>>
>>javax.servlet.ServletException: BeanUtils.populate
>>	at 
>>org.apache.struts.util.RequestUtils.populate(RequestUtils.java:774)
>>	at 
>>org.apache.struts.action.ActionServlet.processPopulate(ActionS
>>ervlet.java:2061)
>>	at 
>>org.apache.struts.action.ActionServlet.process(ActionServlet.j
>>ava:1563)
>>	at 
>>org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:509)
>>
>>.....
>>root cause:
>>
>>java.lang.IllegalArgumentException: argument type mismatch
>>    
>>
>
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>