map-backed ActionForm

[Claudia Woestheinrich <cl...@vit.de>]

Hello,

my JSP-Code is:
<html:form action="/ProjektDDE.do">
......

    <tr>
        <td class=tl1><html:checkbox property="value" value="
<%=ent.getEntity_id().toString()%>" >&nbsp;<%=ent.getDde
()%></html:checkbox></td>

        <td class=tl1>Anzahl: <html:text property="value(key)" size
="2"/></td>
     </tr>

and the ActionForm:

public class ProjektDDEForm extends ActionForm{

    private Map enten;


    /** Creates a new instance of ProjektDDEForm */
    public ProjektDDEForm() {

    }

    public Map getEnten(){
        return enten;
    }

    public void setEnten(Map _map){
        enten=_map;
    }

    public void setValue(String _key, String _value)throws Exception
{
        getEnten().put(_key,_value);
    }

    public Object getValue(String _key)throws Exception{
        return enten.get(_key);
    }


}

In the Action-Class:

... ProjektDDEForm form=(ProjektDDEForm)actionForm;

           Map map=form.getEnten();
  Line 60:      Iterator it=map.keySet().iterator();
      while (it.hasNext()){
                String key=(String)it.next();
                System.out.println("key  "+key);
                System.out.println("value "+map.get(key));
            }



2004-09-06 10:19:57 StandardWrapperValve[action]: Servlet.service()
for servlet action threw exception
java.lang.NullPointerException
     at
de.vit.AdisAded.actions.ProjektDDEAction.execute(ProjektDDEAction.java:60)
     at
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
     at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
     at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
     at
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
     at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
     at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.jav

What is wrong???

Thanks Claudia


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Re: map-backed ActionForm

[Shinobu Kawai <sh...@gmail.com>]

Hi Claudia,

> and the ActionForm:
> 
> public class ProjektDDEForm extends ActionForm{
> 
>    private Map enten;
> 
>    /** Creates a new instance of ProjektDDEForm */
>    public ProjektDDEForm() {
> 
>    }
> 
>    public Map getEnten(){
>        return enten;
>    }
> 
>    public void setEnten(Map _map){
>        enten=_map;
>    }

> In the Action-Class:
> 
> ... ProjektDDEForm form=(ProjektDDEForm)actionForm;
> 
>           Map map=form.getEnten();
>  Line 60:      Iterator it=map.keySet().iterator();

> 2004-09-06 10:19:57 StandardWrapperValve[action]: Servlet.service()
> for servlet action threw exception
> java.lang.NullPointerException
>     at
> de.vit.AdisAded.actions.ProjektDDEAction.execute(ProjektDDEAction.java:60)
Since Map#keySet() will not return null, I would say that your enten is
null.  Are you explicitly setting it via setEnten()?  If so, where?  If
not, set it before you use it.  (Or you can just initialize it on object
creation.)

Best regards,
-- Shinobu Kawai

-- 
Shinobu Kawai(shinobu.kawai@gmail.com)

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