Please excuse my ignorance, I have never worked with converters. But the reference is needed for the "value" attribute, and when value is being set to the object in the "Value" attribute, wouldn't the frame work call getAsObject with the value selected in the drop down list ? If so, why should the list of select items have a reference to the category object ?
Srikanth -----Original Message----- From: Kostas Karadamoglou [mailto:[EMAIL PROTECTED] Sent: Friday, March 18, 2005 11:10 AM To: MyFaces Discussion Subject: Re: Problem with the getAsObject of a Converter But if I will do that I will loose a reference to the object and I will only have the id which is useless alone Srikanth Madarapu wrote: >Can you try > > this.allCategories.add(new SelectItem(category.getId(), > category.getTitle())); > >The getId() method should return the same value as returned by getAsString(). >I think there is some problem... > >Srikanth > > >-----Original Message----- >From: Kostas Karadamoglou [mailto:[EMAIL PROTECTED] >Sent: Friday, March 18, 2005 10:56 AM >To: MyFaces Discussion >Subject: Re: Problem with the getAsObject of a Converter > > >Hi, I attached the getter of allcategories, as you can see I return a >list of selectItem objects > > public List getAllCategories(){ > if(this.allCategories==null){ > this.allCategories=new ArrayList(); > this.allCategories.add(new SelectItem(new Category(),"Choose >a category...")); > List categories=this.eventRegistry.getCategories(); > for(Iterator iter=categories.iterator(); iter.hasNext();){ > Category category=(Category)iter.next(); > this.allCategories.add(new SelectItem(category, >category.getTitle())); > } > } > return this.allCategories; > } > >Srikanth Madarapu wrote: > > > >>What is the return type of allCategories ? >> >>The list coming from allCategories should be a list of "SelectItem" objects, >>I think in yours case its just a list of Strings >> >>-Srikanth >> >> >>-----Original Message----- >>From: Kostas Karadamoglou [mailto:[EMAIL PROTECTED] >>Sent: Friday, March 18, 2005 9:17 AM >>To: [email protected] >>Subject: Problem with the getAsObject of a Converter >> >> >>Hi again!!! >> >>I have another problem now, Very strange Can you suggest me a solution? >> >>I created a converter for objects of type Category in order to display >>some Category beans in a selectOneMenu tag. >> >>I have debuged the application and I noticed a strange behaviour of JSF >>which I cannot understand. >>Below I have the sequence explanation of the problem and the content of >>each method and jsp fragment. >> >>1)The getAsString method works perfectly and returns the following >>strings "0","1","2","3","4","5","6","7" >> >>2)The page is displayed properly, and I choose from the drop down menu a >>category. >> >>2)Afterwords JSF invokes getAsObject (I think for the chosen option) >>with the str parameter null !!!!!!! >>In this situation I return a null object (which is wrong). >> >>4)After that when the page is redisplayed the getAsString throw an >>Exception because of the null value >> >>JSP------------------------------------------------------- >> <h:selectOneMenu id="selectCategory" >>converter="#{categoryConverter}" value="#{eventHandler.selectedCategory}"> >> <f:selectItems id="allCategories" >>value="#{eventHandler.allCategories}"/> >> </h:selectOneMenu> >> >>getAsString------------------------------------------------ >> >> public String getAsString(FacesContext facesContext, UIComponent >>uIComponent, Object obj) throws ConverterException { >> String retValue=null; >> if(obj==null) >> throw new ConverterException("not null object of type >>Category expected"); >> else if(obj instanceof Category){ >> Category category=(Category)obj; >> map.put(new Integer(category.getId()), category); >> retValue=String.valueOf(category.getId()); >> }else{ >> throw new ConverterException("object of type Category >>expected received: "+obj.getClass().getName()+"="+obj.toString()); >> } >> return retValue; >> } >> >>getAsObject------------------------------------------------ >> >> public Object getAsObject(FacesContext facesContext, UIComponent >>uIComponent, String str) throws ConverterException { >> Category retValue=null; >> if(str!=null){ >> try{ >> System.out.println(str); >> Integer id=Integer.valueOf(str); >> retValue=(Category)map.get(id); >> }catch(Exception ex){ >> throw new ConverterException("a number formatted string >>expected"); >> } >> >> }else{ >> //throw new ConverterException("a not null string expected"); >> return null; >> } >> return retValue; >> } >> >> >> >> >> > > > >
