Unable to execute jar file....got following stack trace.

Hi,

i'm using jasper report for generating report.

following is my java class for displaying report,

package com.india.mumbai.tg;
 
import net.sf.jasperreports.view.JasperViewer;
import net.sf.jasperreports.engine.xml.JRXmlLoader;
import net.sf.jasperreports.engine.JasperCompileManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.design.JasperDesign;
import net.sf.jasperreports.engine.JasperReport;
import java.io.OutputStream;
import java.sql.DriverManager;
 
import com.mysql.jdbc.Connection;
 
/**
 * Driver program to connect to a database and to view a jasper report (.jrxml)
 * @author Oguzhan Topsakal
 * @since 23 March 2006
 *
 * Required jar files to run this class:
 * 1. jasperreports-1.2.0.jar
 * 2. classes12.jar (for Oracle JDBC connection)
 * 3. commons-beanutils-1.5.jar
 * 4. commons-collections-2.1.jar
 * 5. commons-digester-1.7.jar
 * 6. commons-logging-1.0.2.jar
 *
 */
 
public class ReportDriver {
    /**
     * Takes 3 parameters: databaseName, userName, password
     * and connects to the database.
     * @param databaseName holds database name,
     * @param userName holds user name
     * @param password holds password to connect the database,
     * @return Returns the JDBC connection to the database
     */
    public static Connection connectDB(String databaseName, String userName, String password) {
        Connection jdbcConnection = null;
        try{
        
        //Class.forName(connectionClass);
//Connection conn = DriverManager.getConnection(connectionName);

Class.forName("com.mysql.jdbc.Driver");
            jdbcConnection = (Connection)DriverManager.getConnection("jdbc:mysql://localhost:3306/utility?user=root&password=root");
        }catch(Exception ex) {
            String connectMsg = "Could not connect to the database: " + ex.getMessage() + " " + ex.getLocalizedMessage();
            System.out.println(connectMsg);
        }
        return jdbcConnection;
    }
    
    /**
     * Takes 4 parameters: databaseName, userName, password, reportFileLocation
     * and connects to the database and prepares and views the report.
     * @param databaseName holds database name,
     * @param userName holds user name
     * @param password holds password to connect the database,
     * @param reportFile holds the location of the Jasper Report file (.jrxml)
     */
    public static void runReport() {
        try{
        String reportFile = "contactReport.jrxml";
            JasperDesign jasperDesign = JRXmlLoader.load(reportFile);
            JasperReport jasperReport = JasperCompileManager.compileReport(jasperDesign);
            Class.forName("com.mysql.jdbc.Driver");
            Connection jdbcConnection = (Connection)DriverManager.getConnection("jdbc:mysql://localhost:3306/utility?user=root&password=root");
            JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, null, jdbcConnection);
            JasperViewer.viewReport(jasperPrint);
        }catch(Exception ex) {
            String connectMsg = "Could not create the report " + ex.getMessage() + " " + ex.getLocalizedMessage();
            System.out.println(connectMsg);
        }
    }
    
    /**
     * Uses runReport method to connect to the database and to prepare and view the report.
     * @param args Takes 4 arguments as an input: databaseName, userName, password, reportFileLocation
     * args[0] holds database name,
     * args[1] holds user name
     * args[2] holds password to connect the database,
     * args[3] holds the location of the Jasper Report file (.jrxml)
     */
    public static void main(String[] args) {
        runReport();
    }
}

i have created jar(JR.jar) file

the entry of MANIFEST.MF

when i double click on JR.jar file it gives me the following error

I have tested the Jr.jar file with following command and got the following stack trace

i'm also bundeling all the requeired jar file in my JR.jar file

I'm using JBoss Eclipse IDE 1.6, Jasper Assist for creating jasper report.

and i have tried to create jar file from dos as well as IDE but getting the same error.

can anybody help me out ???

You cannot include jars in a jar. The classloaders will not find classes inside of multiple jars.
To do this, you'll need to write ( or find) a custom classloader or better add classes to your JAR File's Classpath according to

http://java.sun.com/docs/books/tutorial/deployment/jar/downman.html

Not an advanced question. Moving...

Also make sure that your manifest file ends with an empty line, otherwise the last line in the manifest file will not be parsed correctly.

See this page, which says:

"Warning: The text file from which you are creating the manifest must end with a new line or carriage return. The last line will not be parsed properly if it does not end with a new line or carriage return."