can't open jar file

I can't open this jar file:

JLink - Flow Charts With Java | Free Home & Education software downloads at SourceForge.net

first i double clicked ,but failed.
then from cmd i set path and tried but the manifest main class error came.
i tried to add main class :JLinkFeatures.class to manifest,but then it could not find class.
i tried to add main class :JLink.class to manifest,but then lots of errors with no main class found error.

please explain what is required.

Does the class JLinkFeatures belong to a package? I guess you didn't specify a fully qualify name, such as com.mypackage.JLinkFeature, so that Java couldn't find the class.

Manifest.mf :

Manifest-Version: 1.0
Ant-Version: Apache Ant 1.7.0
Created-By: 1.6.0_03-b05 (Sun Microsystems Inc.)
Main class : jlink.example.JLinkFeatures.class



JLinkFeatures.class

Code java:

---

package jlink.example;
 
import java.awt.*;
import java.io.PrintStream;
import javax.swing.*;
import jlink.flowchart.*;
import jlink.flowchart.graph.JLGraph;
import jlink.icon.JLinkImageDistributor;
 
// Referenced classes of package jlink.example:
//            JLinkGraphModelExample
 
public class JLinkFeatures
{
 
    JFrame frame;
    String titleString;
    JLFlowchart flowchart1;
    JLFlowchart flowchart2;
    JLFlowchart flowchart3;
    JLFlowchart flowchart4;
    JLGraph graph;
    JLCanvas canvas;
    JLabel status;
 
    public JLinkFeatures()
    {
        frame = new JFrame();
        titleString = new String("Untitled Document");
        graph = new JLGraph();
        canvas = new JLCanvas();
        status = new JLabel("JLink Flowchart Authoring Tool v1.0");
        frame.setTitle(titleString);
        frame.setIconImage((new JLinkImageDistributor()).getJLinkWindowImage());
        flowchart1 = new JLFlowchart(graph, 3, Color.WHITE, Color.BLACK, Color.BLACK, new Dimension(500, 600));
        flowchart2 = new JLFlowchart(graph, 5, Color.WHITE, Color.BLACK, Color.BLACK, new Dimension(500, 600));
        flowchart3 = new JLFlowchart(graph, 4, Color.WHITE, Color.BLACK, Color.BLACK, new Dimension(500, 600));
        flowchart4 = new JLFlowchart(graph, 1, Color.WHITE, Color.BLACK, Color.BLACK, new Dimension(500, 600));
        flowchart4.setJLPageOrientation(10);
        JLWorksheet ws = new JLWorksheet();
        ws.setJLWorksheetType(1);
        ws.setAuthor("Jason Barraclough");
        ws.setProcessName("Cooking toast.");
        ws.setChartName("Making Jason Breakfast.");
        ws.setChartID(1);
        ws.setProcessNumber(13);
        ws.setDescription("Looking after Jason has its quirks.  Cooking him toast is no exception.");
        ws.setDate("10th Jan 2008");
        ws.setPage(1);
        canvas.addNewContainer(flowchart1);
        canvas.addNewContainer(flowchart2);
        canvas.addNewContainer(flowchart3);
        canvas.addNewContainer(flowchart4);
        canvas.addNewContainer(ws);
        frame.getContentPane().add(new JScrollPane(canvas), "Center");
        frame.getContentPane().add(status, "South");
        frame.setSize(600, 600);
        frame.setDefaultCloseOperation(3);
        frame.setExtendedState(6);
        frame.setVisible(true);
        JLinkGraphModelExample g1 = new JLinkGraphModelExample();
        System.out.println(g1.toast.toString());
    }
 
    public static void main(String args[])
    {
        new JLinkFeatures();
    }
}

---

CMD INPUT/OUTPUT:

C:\Documents and Settings\dipak>cd desktop

C:\Documents and Settings\dipak\Desktop>path= C:\Program Files\Java\jre6\bin

C:\Documents and Settings\dipak\Desktop>java -jar JLink.jar
Exception in thread "main" java.io.IOException: invalid header field name: Main
class
at java.util.jar.Attributes.read(Unknown Source)
at java.util.jar.Manifest.read(Unknown Source)
at java.util.jar.Manifest.<init>(Unknown Source)
at java.util.jar.JarFile.getManifestFromReference(Unk nown Source)
at java.util.jar.JarFile.getManifest(Unknown Source)

C:\Documents and Settings\dipak\Desktop>

It may not be a executable jar, If it's not. Then figure out the main class and run it via a sample html page.

Also.. If the jar isnt signed it sometimes causes problems also. Other then that id contact the support of the project and ask..

It is an application.

There is a typo: Main class : jlink.example.JLinkFeatures.class

Instead, it must be: Main-Class: jlink.example.JLinkFeatures.class