Some object serialization problems for discussion(4)-ObjectInputS tream

[Wu, Gansha]

We have many chances that Classpath classes have different object layout 
(e.g, private fields) from JDK classes, so when we construct class according 
to an object stream generated by JDK, issues happened in 
ObjectInputStream.readFields(): even the field name doesn't exist in local 
class, we still call setXXXField to set it, then exception happens and program 
halts. So we might add a try-catch to wrap setXXXField, that's to say, to 
ignore 
it and try to continue, but not halt.
The patch is like this:

private void readFields (Object obj, ObjectStreamField[] stream_fields,
                           boolean call_read_method,
                           ObjectStreamClass stream_osc)
    throws ClassNotFoundException, IOException
  {
    ... ...
    while (stream_idx < stream_fields.length
           && real_idx < real_fields.length)
    {
      ... ...
+    try{ 
      if (type == Boolean.TYPE)
      {
        ... ...
        if (set_value)
          setBooleanField (obj, field_name, value);
      }
      else if (type == Byte.TYPE)
      {
        ... ...
        if (set_value)
          setByteField (obj, field_name, value);
      }
      else if (type == Character.TYPE)
      {
        ... ...
        if (set_value)
          setCharField (obj, field_name, value);
      }
      else if (type == Double.TYPE)
      {
        ... ...
        if (set_value)
          setDoubleField (obj, field_name, value);
      }
      else if (type == Float.TYPE)
      {
        ... ...
        if (set_value)
          setFloatField (obj, field_name, value);
      }
      else if (type == Integer.TYPE)
      {
        ... ...
        if (set_value)
          setIntField (obj, field_name, value);
      }
      else if (type == Long.TYPE)
      {
        ... ...
        if (set_value)
          setLongField (obj, field_name, value);
      }
      else if (type == Short.TYPE)
      {
        ... ...
        if (set_value)
          setShortField (obj, field_name, value);
      }
      else
      {
        Object value =
          default_initialize ? null : readObject ();
        if (set_value)
          setObjectField (obj, field_name,
                          real_field.getTypeString (), value);
      }
+    }catch(NoSuchFieldError ex){
+      // DEBUGln ("Field '" + field_name + "' doesn't not exist in local " + 
stream_osc.forClass());
+    } 
    }
  }