6 Replies Latest reply on Oct 7, 2010 8:41 AM by Tina Ng

    RequestParameter is null

    Tina Ng Newbie
      Hello,

      My request parameter works fine if my url only contains one parameter:
      http://localhost:8080/Lave/pages/admin/listeCodeLibelle.seam?myParam=eftco

      When my page is loaded, I do some actions (like delete or creation) and my url is like this (another param is added):
      http://localhost:8080/Lave/pages/admin/listeCodeLibelle.seam?myParam=eftco&cid=1

      At this time, I my parameter "myParam" is null

      I define myParam:

      @Scope(ScopeType.CONVERSATION)
      @Name("gestionCodeLibelle")
      public class GestionCodeLibelleAction<T extends AvecLibelle & AvecCode> {

          @RequestParameter(value = "myParam")
          private String            myParam;

      }

      Please tell me why?

      Thanks,
      Tina
        • 1. Re: RequestParameter is null
          Tina Ng Newbie
          one remark that the delete action that I perform, is define in *<a4j:commandLink>*

          <a4j:commandLink ajaxSingle="true"
               action="#{gestionCodeLibelle.deleteSelectedItem}"
               reRender="myTable" eventsQueue="serviceQueue">
               <h:graphicImage value="/img/icones/supprimer.png" />
          </a4j:commandLink>


          • 2. Re: RequestParameter is null
            Raymond Eperen Newbie

            I don't see where you're passing the parameter with your a4j:commandLink.  I think you need to do something like:



            <a4j:commandLink ajaxSingle="true"
             action="#{gestionCodeLibelle.deleteSelectedItem}"
             reRender="myTable" eventsQueue="serviceQueue">
             <h:graphicImage value="/img/icones/supprimer.png" />
             <f:param name="myParam"
                      value="#{some value}"/>
            </a4j:commandLink>



            Also, the


            (value="myParam" )



            is not necessary as long as the parameter is named the same of the property.  @RequestParameter is all you need based on what you have in GestionCodeLibelleAction.

            • 3. Re: RequestParameter is null
              Shervin Asgari Master

              My guess is because you are using POST and not GET.

              • 4. Re: RequestParameter is null
                Tina Ng Newbie
                Thanks Ray Van.
                It works after adding <f:param>

                But one more problem is that when I perform add a new item, even I can get myParam from request, I have this error: @Out attribute requires non-null value: gestionCodeLibelle.myParam"

                However, I already added @In @Out to my request like this:


                    @In
                    @Out
                    @RequestParameter(value = "myParam")
                    private String            myParam;





                • 5. Re: RequestParameter is null
                  Raymond Eperen Newbie

                  First of all, I would remove the @In, the @RequestParmeter takes care of the injection.  As to why it is not there to @Out, I'm not sure, Can you share the code for your backing bean?

                  • 6. Re: RequestParameter is null
                    Tina Ng Newbie

                    It works if I put


                    @Out(required = falsed)




                    Anyway, the code is followed


                    action declared in xhtml




                    <a4j:commandLink ajaxSingle="true"
                         action="#{gestionCodeLibelle.addNewItem}"
                         reRender="myTable" eventsQueue="serviceQueue">
                       <h:graphicImage value="/img/icones/enregistrer.png" />
                       <f:param name="myParam" value="#{myParam}"/>
                    </a4j:commandLink>




                    It passes to class ACTION




                    @AutoCreate
                    @Scope(ScopeType.CONVERSATION)
                    @Name("gestionCodeLibelle")
                    public class GestionCodeLibelleAction<T extends AvecLibelle & AvecCode> {
                    
                        @Out
                        @RequestParameter(value = "myParam")
                        private String            myParam;
                        
                        @In
                        @Out
                        private T                 itemToAdd;
                    
                        ...
                    
                        public void addNewItem() {
                            boolean valid = true;
                            /*
                             * check if the adding code is null or already in the list created codes
                             * if yes, notify user if no, add a new one
                             */
                    
                            valid = validateCode();
                            if (valid) {
                                entityManager.merge(itemToAdd);
                                myList.add(itemToAdd);
                                initItemToAdd();
                                // Collections.sort(consignes, new Consigne.ConsigneComparator());
                                logger.info("item added");
                            }
                        }
                    
                    
                        private boolean validateCode() {
                            boolean isValid = true;
                    
                            if (itemToAdd.getCode() == null) {
                                isValid = false;
                                FacesMessages.instance().addFromResourceBundle(Severity.ERROR,
                                        "code.cannotNull");
                            } else {
                    
                                if (Util.CONSIGNE_PARAM.equals(myParam)) {
                                    if (itemToAdd.getCode().length() != 6) {
                                        isValid = false;
                                        FacesMessages.instance().addFromResourceBundle(
                                                Severity.ERROR, "code.length", Util.CONSIGNE_PARAM,
                                                "6");
                                    }
                                } else if (Util.EFTCO_PARAM.equals(myParam)) {
                                    if (itemToAdd.getCode().length() != 3) {
                                        isValid = false;
                                        FacesMessages.instance().addFromResourceBundle(
                                                Severity.ERROR, "code.length", Util.EFTCO_PARAM,
                                                "3");
                                    }
                    
                                    if (!itemToAdd.getCode().matches(Util.EFTCO_CODE_EXP)) {
                                        isValid = false;
                                        FacesMessages.instance().addFromResourceBundle(
                                                Severity.ERROR, "eftco.code.wrongFormat");
                                    }
                                }
                            }
                    
                            if (isValid) {
                                for (T item : myList) {
                                    if (item.getCode().equals(itemToAdd.getCode().toUpperCase())) {
                                        isValid = false;
                                        FacesMessages.instance()
                                                .addFromResourceBundle(Severity.ERROR,
                                                        "code.existed", itemToAdd.getCode());
                                        break;
                                    }
                                }
                            }
                            return isValid;
                        }
                    
                    




                    In the Entity




                    @Table(uniqueConstraints = @UniqueConstraint(columnNames = { "ID", "CODE" }), name = "CONSIGNE")
                    @Entity
                    public class Consigne extends EntiteAvecLibelleLazyLoaded implements
                            Serializable, AvecCode {
                    
                        @Id
                        @SequenceGenerator(name = "generator_consigne", sequenceName = "SEQ_CONSIGNE", initialValue = 0, allocationSize = 1)
                        @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "generator_consigne")
                        @Column(name = "ID", precision = 19, scale = 0)
                        public long getId() {
                            return id;
                        }
                    
                        public void setId(final long id) {
                            this.id = id;
                        }
                    
                        @Column(name = "CODE", unique = true, nullable = false, length = 6, columnDefinition = "char(6)")
                        @NotNull(message = "#{messages['code.cannotNull']}")
                        @Length(max = 6, message = "#{messages['consigne.code.length']}")
                        public String getCode() {
                            return code;
                        }
                    
                        public void setCode(final String code) {
                            this.code = code.toUpperCase();
                        }