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Thread: can't open jar file

  1. #1
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    Default 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.


  2. #2

    Default Re: can't open jar file

    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.

  3. #3
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    Default Re: can't open jar file

    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
    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>

  4. #4
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    Default Re: can't open jar file

    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..

  5. #5
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    Default Re: can't open jar file

    It is an application.

  6. #6

    Default Re: can't open jar file

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

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

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