Xpp3Dom.getValue() returns null despite @NonNull annotation #388

Xpp3Dom.getValue() is annotated @NonNull (line 141) but returns value which defaults to null when constructed with Xpp3Dom(String name) (line 92). This violates the non-null contract — callers who trust the annotation and omit a null check will encounter NullPointerException.

The builder at Xpp3DomBuilder.java:201 already works around this:

element.setValue(""); // null in xpp3dom, but we don't do that around here

Fix: initialize value to "" in the one-arg constructor, or change the field declaration to private String value = "";.