how to correct this code

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Java

hello every one help please :
Here is my java code that makes parcour an xml file to retrieve data and build with these data with a graph api jgraph
I will represent the graph in a Jframe
the result I get only empty JFrame
it seems it does not run the first instructions

	import java.awt.BorderLayout;
import java.io.File;
import java.io.IOException;

	import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

	import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import com.mxgraph.util.mxConstants;
import com.mxgraph.view.mxGraph;
import com.mxgraph.model.mxGeometry;
import com.mxgraph.swing.mxGraphComponent;
	public class Tester extends JFrame {
		 
		  /** Pour éviter un warning venant du JFrame */
		  private static final long serialVersionUID = -8123406571694511514L;
		 
		  public static void main(String[] args) {
		
		 
		    
		  System.out.println("Bonjour");
 
		 try {
		    	
             File nomf = new File("C:/Users/Hela/Desktop/1_auto.xml");
		    	DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
		    	DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
		    	Document doc = dBuilder.parse(nomf);
		    	doc.getDocumentElement().normalize();
		    	System.out.println("Bonjour");
		    	
		    	mxGraph graph = new mxGraph();
			    Object parent = graph.getDefaultParent();
			 
			  graph.getModel().beginUpdate();

		    	//System.out.println("root of xml file" + doc.getDocumentElement().getNodeName());
		    	NodeList nodes = doc.getElementsByTagName("triplet");
		    	System.out.println("==========================");
		    	
		        Object racine= graph.insertVertex(parent, null,"brad pit", 20, 20, 80, 30);
		        
  		    	for (int i = 0; i < nodes.getLength(); i++) {
		    	Node node = nodes.item(i);

		    	if (node.getNodeType() == Node.ELEMENT_NODE) {
		    	Element element = (Element) node;
		    
		    	Object obj1 =graph.insertVertex(parent, null,getValue("object", element) , 20, 20, 80, 30,
		    	mxConstants.STYLE_SHAPE + "="+mxConstants.SHAPE_ELLIPSE);
		    	 graph.insertEdge(parent, null,getValue("predicate", element) , racine, obj1);
		    	
		    
		    	}
		    	
		    	}}
		 
		    	
		    	
		    		catch (Exception ex) {
				ex.printStackTrace();}
		    	
		    	
		    	
		    	
		    	
		    finally {
		      graph.getModel().endUpdate();
		    }
		 
		    mxGraphComponent graphComponent = new mxGraphComponent(graph);
		    getContentPane().add(graphComponent);
		    	}
	
		    	
		    	
		    	
		    	private static String getValue(String tag, Element element) {
		    		NodeList nodes = element.getElementsByTagName(tag).item(0).getChildNodes();
		    		Node node = (Node) nodes.item(0);
		    		return node.getNodeValue();
		    		}
		    	
		
		  
			 JPanel contentPane;
			    Graphe frame = new Graphe();
			    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			    frame.setSize(400, 320s);
			    frame.setVisible(true);
			    
			    
				frame.setBounds(100, 100, 450, 300);
			contentPane = new JPanel();
				contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
				contentPane.setLayout(new BorderLayout(0, 0));
				
			    
			    
			    System.out.println("Bonjour");
		  }
		  
		  
		
		    	}