public void javacError(String message,Throwable t){
  messager.printMessage(Diagnostic.Kind.ERROR,message + (t == null ? "" : (": " + t)));
  if (t != null)   t.printStackTrace();
}

public void javacError ( String message , Throwable t ) { messager . printMessage ( Diagnostic . Kind . ERROR , message + ( t == null ? "" : ( ": " + t ) ) ) ; if ( t != null ) t . printStackTrace ( ) ; }
generates an error in the messager that was used to initialize this handlerlibrary .
