it seems that there is a bug in java Reflection class [
java.lang.reflect ] that will allow an illegall access permission to
private fields and methods.
for example take a look at the code below :

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public class Test
{
   private void f()
   {
           System.out.println("A private Method has been invoked from
Test");
   }
}
------------------------------------------
By Default there should be no way to invoke f2 from outside of this
class. but by using reflection and setting that methods Accessiblity to
true we can directly invoke that method. just like below:

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import java.lang.reflect.* ;

public class Main
{
   public static void main (String[] args)
   {
       access Access = new access();
       Access.r() ;
   }

}

class access
{
   public void r() {
                       Class x= Test.class;
                   Method[] m=x.getDeclaredMethods();
            try{
                       m[0].setAccessible(true);   // [*]
                       m[0].invoke(new Test(),null);

                       // C'est la vie!! we invoked a private method
outside of the class!!
                       } catch ( Exception e) {e.printStackTrace (); }

              }
   }

------------------------------------------

The result is :
run:
A private Method has been invoked from Test

* by removing this we get illegalAccessException which is normal, but
setting a private method accessible is a bug!