When users got slectitems with null like:
  <f:selectItem itemValue="" itemLabel="op default" />
  <f:selectItem itemValue="0" itemLabel="op1" />
  <f:selectItem itemValue="1" itemLabel="op2" />

may see this error:
java.lang.NumberFormatException: For input string: ""
java.lang.NumberFormatException.forInputString(Unknown Source)
java.lang.Integer.parseInt(Unknown Source)
java.lang.Short.parseShort(Unknown Source)
java.lang.Short.valueOf(Unknown Source)
java.lang.Short.valueOf(Unknown Source)
com.icesoft.faces.renderkit.dom_html_basic.MenuRenderer.isConversionMatched(MenuRenderer.java:663)
com.icesoft.faces.renderkit.dom_html_basic.MenuRenderer.isSelected(MenuRenderer.java:469)

With class version of this list like <f:selectItems> these errors are not occurs.

I think that this patch should be added to file
com.icesoft.faces.renderkit.dom_html_basic.MenuRenderer.java

Around line 649-653

    private boolean isConversionMatched(String sentinel, Object selectedValue){
     boolean match = false;
> if (sentinel!=null && sentinel.length()==0 && selectedValue==null){
> match = true;
> } else
     if (selectedValue instanceof Long){
     if (selectedValue.equals(Long.valueOf(sentinel))) {