public XTraceReport put(Object key,Object value){
  if (key != null) {
    builder.addKey(key.toString());
    builder.addValue(value == null ? "null" : value.toString());
  }
  return this;
}

public XTraceReport put ( Object key , Object value ) { if ( key != null ) { builder . addKey ( key . toString ( ) ) ; builder . addValue ( value == null ? "null" : value . toString ( ) ) ; } return this ; }
add a key - value pair to the report
