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

[Jigar Naik]

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

  
Manifest-Version: 1.0
Sealed: true
Main-Class: com.india.mumbai.tg.ReportDriver

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

  Could not find the main class. Program will exit.  

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

  
C:\Program Files\Java\jdk1.6.0\bin>java -jar JR.jar
Exception in thread "main" java.lang.NoClassDefFoundError: net/sf/jasperreports/engine/design/JasperDesign

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

  
jasperreports-1.2.0.jar, 
commons-beanutils-1.5.jar, 
commons-collections-2.1.jar, 
commons-digester-1.7.jar, 
commons-logging-1.0.2.jar.   

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 ???

[Maurizio Nagni]

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

[Paul Sturrock]

Not an advanced question. Moving...

[Jesper de Jong]

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."