Hi i received java.io.InvalidClassException whenevery i run my program,please solve my problem

[vijay Panner]

import java.awt.Dimension;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.HashMap;
import javax.swing.JFrame;
 :confused:
import net.sf.jasperreports.engine.JREmptyDataSource;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.swing.JRViewer;

/**
 * 
 * @author Hans Kristanto
 */
public class MainApplication {

	Connection conn = null;

	public void initConnection() {

		String HOST = "jdbc:mysql://localhost:3306/fws";
		String USERNAME = "root";
		String PASSWORD = "root";
		try {
			Class.forName("com.mysql.jdbc.Driver");
		} catch (ClassNotFoundException ex) {
			ex.printStackTrace();
		}

		try {
			conn = DriverManager.getConnection(HOST, USERNAME, PASSWORD);
			System.out.println(conn);
		} catch (SQLException ex) {
			ex.printStackTrace();
		}
	}

	public void showReport() throws FileNotFoundException {

		// Path to your .jasper file in your package
		String reportName = "c://reports/Testing.jasper";
		String reportFile = "c:\\reports\\Testing.jasper";

		System.out.println("showReport1 >>>>>" + reportName);
		// Get a stream to read the file
		// InputStream is =
		// this.getClass().getClassLoader().getResourceAsStream(reportName);
		// InputStream is = getClass().getResourceAsStream(reportName);

		try {
			File file = new File(reportFile);
			System.out.println(file.getName());
			InputStream is = new BufferedInputStream(new FileInputStream(file));

			System.out.println("is >>>>>" + is);

			// Fill the report with parameter, connection and the stream reader
			JasperPrint jp = JasperFillManager.fillReport(reportName, null,conn);

			// Viewer for JasperReport
			JRViewer jv = new JRViewer(jp);
			System.out.println("showReport4 >>>>>" + reportName);
			// Insert viewer to a JFrame to make it showable
			JFrame jf = new JFrame();
			jf.getContentPane().add(jv);
			jf.validate();
			jf.setVisible(true);
			jf.setSize(new Dimension(800, 600));
			jf.setLocation(300, 100);
			jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		} catch (JRException ex) {
			ex.printStackTrace();

		}
	}

	public static void main(String[] args) throws FileNotFoundException {

		MainApplication ma = new MainApplication();
		ma.initConnection();
		ma.showReport();
	}

}

Error is :

java.io.InvalidClassException: net.sf.jasperreports.engine.base.JRBaseReport; local class incompatible: stream classdesc serialVersionUID = 10200, local class serialVersionUID = 606
at java.io.ObjectStreamClass.initNonProxy(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:86)
... 3 more

[Stanislav Lapitsky]

Looks like serialization issue. Check versions f library you use and version of library used to create the file.

Regards,
Stas

[Campbell Ritchie]

Welcome to JavaRanch

Please remember the code button; since you are new I have edited your post and you can see how much better it looks.