JSF backing bean can't access the override method of the nested calss

Question

hi all. i'm using jsf1.2 The xhtml as followings:

<h:commandLink label="Open" action="#{surveySubFmTreeViListWeb.dtw.updatePage}">

then the backing bean looks like:

public class SurveySubFmTreeViListWeb 
  { 
    .....
        private DataTableWeb<Entity> dtw = new DataTableWeb<Entity>(Entity.class) {
                @Override
                public void updatePage() throws Exception 
                {...snip...}
        };
  }

if i override the public method of Class DataTableWeb which is the nested class of backing bean. i will get the following exceptions as:

java.lang.IllegalAccessException: Class org.apache.el.parser.AstValue can not access a member of class com.ss.survey.web.SurveySubFmTreeViListWeb $1 with modifiers "public"

however,if access the public method didn't be override in the backing bean ,it will work out ok.if anyone can help me figure it out ? Any help is appreciated.

Answer 1

That's a general problem with reflection. Its access control only permits a subset of what language itself permits. Basically, for reflection to work, you need to make everything public.

In your case you need to make dtw initializer a non-anonymous public class, sort of like this:

private DataTableWeb<Entity> dtw = new CustomDataTableWeb ();

public static class CustomDataTableWeb extends DataTableWeb <Entity>
{
    @Override
    public void updatePage() throws Exception 
    {...snip...}
};

If you need access to outer this, don't forget to remove static from class definition.

Answer 2

thank u again . can i take it as followings

what's happening behind the scenes:
action="#{surveySubFmTreeViListWeb.dtw.updatePage}" 

public static void main(String[] args) throws Exception {
Object dtw = SurveySubFmTreeViListWeb.getClass().getDeclaredMethod("getDtw", null).invoke(surveySubFmTreeViListWeb, null);
Object action = dtw .getClass().getDeclaredMethod("updatePage",null).invoke(dtw , 0);

}

because i has the reference to the object dtw,so the reflection can access the public method of dtw. but if i override some public method in the Class surveySubFmTreeViListWeb ,the reflection won't work caused by access restricted