exception invalid stream header, streamcorrupted

[sijujosethomas]

i'm trying to pass the JasperPrint object from the servlet to the applet and view the report through the applet

 

my code is as follows:

 

my servlet:

 

import java.io.IOException;

import java.io.ObjectOutputStream;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.HashMap;

 

import javax.servlet.ServletException;

import javax.servlet.ServletOutputStream;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

 

import net.sf.jasperreports.engine.JRException;

import net.sf.jasperreports.engine.JRResultSetDataSource;

import net.sf.jasperreports.engine.JasperCompileManager;

import net.sf.jasperreports.engine.JasperFillManager;

import net.sf.jasperreports.engine.JasperPrint;

import net.sf.jasperreports.engine.JasperReport;

import net.sf.jasperreports.engine.design.JasperDesign;

import net.sf.jasperreports.engine.xml.JRXmlLoader;

 

public class JRServlet extends HttpServlet {

 

private Connection con = null;

 

private PreparedStatement pst = null;

 

private ResultSet rs = null;

 

protected void doGet(HttpServletRequest req, HttpServletResponse res)

throws ServletException, IOException {

 

doPost(req,res);

}

 

 

public void doPost(HttpServletRequest req, HttpServletResponse res)

throws ServletException, IOException {

try {

DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());

con = DriverManager.getConnection("mydb", "username","password");

System.out.println("connection created");

String sql = "my query";

pst = con.prepareStatement(sql);

rs = pst.executeQuery();

JRResultSetDataSource jrds = new JRResultSetDataSource(rs);

JasperDesign jd = JRXmlLoader.load("myreportfile.jrxml");

JasperReport jr = JasperCompileManager.compileReport(jd);

JasperPrint jp = JasperFillManager.fillReport(jr, new HashMap(),

jrds);

 

 

res.setContentType("application/octet-stream");

 

ServletOutputStream outstr = res.getOutputStream();

ObjectOutputStream oos = new ObjectOutputStream(outstr);

oos.writeObject(jp);

oos.flush();

oos.close();

 

outstr.flush();

outstr.close();

 

} catch (SQLException se) {

System.out.println("SQLException:" + se.getMessage());

} catch (JRException jre) {

System.out.println("JRException:" + jre.getMessage());

} finally {

try {

rs.close();

pst.close();

con.close();

 

} catch (SQLException se) {

 

}

}

 

}

 

}

 

 

my applet:

 

import java.applet.Applet;

import java.awt.Button;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.IOException;

import java.io.InputStream;

import java.io.ObjectInputStream;

import java.net.MalformedURLException;

import java.net.URL;

import java.net.URLConnection;

 

import net.sf.jasperreports.engine.JasperPrint;

import net.sf.jasperreports.view.JasperViewer;

 

public class JRApplet extends Applet {

 

 

 

private Button openJRViewer = new Button("Open");

 

public void init() {

add(openJRViewer);

openJRViewer.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

receiveData();

}

});

 

}

private URLConnection getServletConnection() throws MalformedURLException,

IOException {

 

URL urlServlet = new URL(getCodeBase(), "servlet");

URLConnection con = urlServlet.openConnection();

con.setDoInput(true);

con.setDoOutput(false);

con.setUseCaches(false);

con.setRequestProperty("Content-Type",

"application/x-java-serialized-object");

 

return con;

}

private void receiveData() {

try {

System.out.println("inside method");

//connection from servlet

URLConnection con = getServletConnection();

System.out.println("after conn");

 

 

// reveive data from servlet

InputStream instr = con.getInputStream();

System.out.println("after instr ");

ObjectInputStream inputFromServlet = new ObjectInputStream(instr);

System.out.println("after ois");

JasperPrint jpo = (JasperPrint) inputFromServlet.readObject();

System.out.println("after jpo");

JasperViewer.viewReport(jpo);

System.out.println("after view");

 

 

} catch (MalformedURLException e) {

System.out.println("MalformedURLException:" + e.getMessage());

 

} catch (IOException ie) {

System.out.println("IOException:" + ie.getMessage());

ie.printStackTrace();

 

} catch (ClassNotFoundException ce) {

System.out.println("ClassNotFoundException:" + ce.getMessage());

}

 

}

 

}

 

 

but i'm getting the following error:

 

IOException:invalid stream header: 4A524170

java.io.StreamCorruptedException: invalid stream header: 4A524170

 

can someone help me on this please...

thanks in advance.

[sijujosethomas]

can we send the JasperPrint object from the servlet to an applet through the response??

[Eng_Faris_Zuriekat]

I had similar problems with passing sub reports. I think you may need to pass the the binary code and re-execute it, since the " invalid stream header" refers to a problem parsing the passed file ".jprint".

[martynhiemstra]

Load your reports by putting them in your classpath. Then load them with your ClassLoader. Then create a jasperprint and then let the JRViewer display the report. Then there is no need for a outputstream what so ever, JRViewer will just appear in front of the applet.

[Teodor Danciu]

Hi,

 

The /demo/samples/webapp sample provided with the project shows you how to use the JasperReports Swing viewer to show reports sent in JasperPrint format by a servlet.

 

I hope this helps.

Teodor