Conversion Error of SelectManyCheckBox

Question

Hi @ all,
I need your help urgently!
I want to realize two SelectManyCheckBox, each of them has a valueChangeListener. When user change the current state of the check boxes, some actions are performed.
The problem now is when one check box is clicked(a valueChangeListener is called), then a conversion error message is shown out, which says there is a conversion error occured at the other SelectManyCheckBox component.
I tried several times and found, only if the presious state of the check box component is empty, such conversion error occurs.
The codes are like following:
                       <TD>
                             <h:selectManyCheckbox value="#{admin.filterSelection1}" id="filter1" immediate="true"
                                  valueChangeListener="#{admin.firstFilter}" onchange="submit()">
                                 <f:selectItems value="#{admin.filters1}"/>                                 
                            </h:selectManyCheckbox>
                       </TD>
                        <TD>
                             <h:selectManyCheckbox value="#{admin.filterSelection2}" id="filter2" immediate="true"
                                  valueChangeListener="#{admin.secondFilter}" onchange="submit()">
                                 <f:selectItems value="#{admin.filters2}"/>                           
                            </h:selectManyCheckbox>
                       </TD>..............
and the corresponding properties in the backing bean are:
     private ArrayList filterSelection1;
     private ArrayList filterSelection2;
     private SelectItem[] filters1;
     private SelectItem[] filters2;in the constructor of the backing bean, i initialized filters1, filters2 also filterSelection1 and filterSelection2. And their set , get methods are generated by eclipse automatically.
Waiting for your answers......
Finally I wish the person, who replied, a happier Christmas, and the person who does not replied, a happy Christmas. :-)
db

Answer 1

thanks for your reply, but i think my problem is not what you meant.
I changed my code a little bit, the conversion error remains......
                       <TD>
                         <h:selectOneRadio value="#{admin.filterSelection1}" id="filter1" layout="pageDirection"
                                        valueChangeListener="#{admin.firstFilter}" immediate="true" onchange="submit()">
                                   <f:selectItem itemValue="studenten" itemLabel="Nur Studenten" />
                                   <f:selectItem itemValue="mitarbeiter" itemLabel="Nur Mitarbeiter" />
                                   <f:selectItem itemValue="alle" itemLabel="Alle" />
                                   <f:selectItem itemValue="selectAll" itemLabel="Alle an/aus" />
                         </h:selectOneRadio>
                       </TD>
                        <TD>
                         <h:selectOneRadio value="#{admin.filterSelection2}" id="filter2" layout="pageDirection"
                                        valueChangeListener="#{admin.secondFilter}" immediate="true" onchange="submit()">
                                   <f:selectItem itemValue="intern" itemLabel="Nur Intern" />
                                   <f:selectItem itemValue="ausser" itemLabel="Nur Auftr�ge" />
                                   <f:selectItem itemValue="alle" itemLabel="Alle" />
                                   <f:selectItem itemValue="selectAll" itemLabel="Alle an/aus" />
                         </h:selectOneRadio>
                       </TD>........................
     private String filterSelection1;
     private String filterSelection2;Beside that, I can not understand why even I set "immediate" property be "true", the set method is stilled called!!!!