[Fatal Error] :1:1: Premature end of file.

henklamers

Hi,

I am working on the last chapter of the Generative Design book entering M_6_2_01. Anyone knows how to solve this problem? When I run it I get this message in my console:

[Fatal Error] :1:1: Premature end of file.
org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 1; Premature end of file.
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:257)
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:347)
    at processing.data.XML.<init>(XML.java:187)
    at processing.core.PApplet.loadXML(PApplet.java:6189)
    at processing.core.PApplet.loadXML(PApplet.java:6179)
    at M_6_2_01.setup(M_6_2_01.java:49)
    at processing.core.PApplet.handleDraw(PApplet.java:2281)
    at processing.core.PGraphicsJava2D.requestDraw(PGraphicsJava2D.java:237)
    at processing.core.PApplet.run(PApplet.java:2177)
    at java.lang.Thread.run(Thread.java:744)
java.lang.NullPointerException

Here is the Generative Design book code:

// M_6_2_01.pde
// 
// Generative Gestaltung, ISBN: 978-3-87439-759-9
// First Edition, Hermann Schmidt, Mainz, 2009
// Hartmut Bohnacker, Benedikt Gross, Julia Laub, Claudius Lazzeroni
// Copyright 2009 Hartmut Bohnacker, Benedikt Gross, Julia Laub, Claudius Lazzeroni
//
// http: //www.generative-gestaltung.de
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at http: //www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

/**
 * loads the name of the links on the wikipedia-site "Superegg"
 * and prints them to the console
 */

XML myXML;
XML[] links;
String query;

void setup() {
  query = "http:" + "//en.wikipedia.org/w/api.php?titles=Superegg&format=xml&action=query&prop=links&pllimit=500";

  try {
    myXML = loadXML(query);
    links = myXML.getChildren("query/pages/page/links/pl"); 

    for (int i = 0; i < links.length; i++) {
      String title = links[i].getString("title");
      println("Link " + i + ": " + title);
    }
  } 
  catch (Exception exception) {
    println(exception);
  }
}

koogs

that looks like it's getting an empty file, maybe because the requested url gives you a 301 redirected before returning the correct page

HTTP request sent, awaiting response... 301 TLS Redirect

henklamers

Thanks! I think I need to study some XML / Processing items than.

J_D

Hi... I'm facing the same problem... Is it a problem related with browser settings or with the XML parser provided with the library 'Generative Design'? thanks

henklamers

Hi J_D

Changed the beginning of line 30: query = "http://

into:

query = "https://

Greetings,

Henk Lamers

J_D

Thank you Henk.

henklamers

Sorry about repeating my answer.

I did not know that I posted them already 3 times.

Greetings,

Henk Lamers