Java ImageView get position and set alignment

[Dmitriy Logov]

http://docs.oracle.com/javase/6/docs/api/javax/swing/text/html/ImageView.html

JEditorPane contains within itself the ImageView. I can get the size and alignment:

    ImageView.getPreferredSpan(View.X_AXIS)); //20px
    ImageView.getPreferredSpan(View.Y_AXIS)); //20px
    ImageView.getAlignment(View.X_AXIS)); //0.5
    ImageView.getAlignment(View.Y_AXIS)); //1.0

I need to get the coordinates x/y (absolute or relative) and change the y alignment to 0.75. How can I do this?

http://javasourcecode.org/html/open-source/jdk/jdk-6u23/javax/swing/text/html/ImageView.java.html
lines 258-267 and 111
How i can change private float vAlign; value ?

http://tutorials.jenkov.com/java-reflection/private-fields-and-methods.html#methods

ImageView privateObject = new ImageView("The Private Value"); 
Field privateStringField = ImageView.class.getDeclaredField("vAlign"); 
privateStringField.setAccessible(true);

error: vAlign has private access in ImageView
Why is this not working?