Add and delete values in POJO based selectOneListbox/selectOneChoice in ADF

//List DataStrucutre to populate values in selectOneListBox
    List<SelectItem> customList =new ArrayList<SelectItem>();

publicvoidsetCustomList(List<SelectItem> customList){
this.customList= customList;
}

public List<SelectItem>getCustomList(){
return customList;
}

//String variable to hold selectOneListBox value
private String selectedVal;

publicvoidsetSelectedVal(String selectedVal){
this.selectedVal= selectedVal;
}

public String getSelectedVal(){
return selectedVal;
}

<af:selectOneListboxid="sol1"contentStyle="width:150px;"size="10"value="#{viewScope.SelectOneListBoxBean.selectedVal}">
<f:selectItemsvalue="#{viewScope.SelectOneListBoxBean.customList}"id="si1"var="variable"/>
</af:selectOneListbox>

<af:panelGroupLayoutid="pgl1"layout="vertical">
<af:inputTextlabel="Enter value to add in Listbox"id="it1"
binding="#{viewScope.SelectOneListBoxBean.itBind}"/>
<af:buttontext="Add Record"id="b1"
actionListener="#{viewScope.SelectOneListBoxBean.addValueInList}"/>
<af:spacerwidth="0"height="10"id="s1"/>
<af:panelGroupLayoutid="pgl2"layout="horizontal">
<af:selectOneListboxid="sol1"contentStyle="width:150px;"size="10"
value="#{viewScope.SelectOneListBoxBean.selectedVal}"
partialTriggers="b1 b2">
<f:selectItemsvalue="#{viewScope.SelectOneListBoxBean.customList}"id="si1"/>
</af:selectOneListbox>
<af:buttontext="Delete"id="b2"
actionListener="#{viewScope.SelectOneListBoxBean.deleteSelectedValue}"/>
</af:panelGroupLayout>
</af:panelGroupLayout>

/**Method to add Record in List
     * @param actionEvent
     */
publicvoidaddValueInList(ActionEvent actionEvent){
//Get value from inputText using component binding
if(itBind.getValue()!=null){
//Add value in List
            customList.add(new SelectItem(itBind.getValue().toString()));
}
}

/**Method that check for selected value in List
     * @param items
     * @param value
     * @return
     */
public SelectItem getItem(List<SelectItem> items, String value){
for(SelectItem si : items){
            System.out.println(si.getValue());
if(si.getValue().toString().equalsIgnoreCase(value)){
return si;
}
}
returnnull;

}

/**Method to delete selected record from List
     * @param actionEvent
     */
publicvoiddeleteSelectedValue(ActionEvent actionEvent){
if(selectedVal !=null){
//Find and delete selected item from List
            customList.remove(getItem(customList, selectedVal));
}
}