Servlet response already use stream, Writer not possible

**ulysse031** · 11/06/2011, 07h36

bonjour
j'ai un message d'erreur la page pdf n'affiche pas sur la page jsf
j'ai message

Code :

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GRAVE: Error Rendering View[/imprimer.xhtml]
java.lang.IllegalStateException: Servlet response already use stream, Writer not possible
	at org.ajax4jsf.webapp.FilterServletResponseWrapper.getWriter(FilterServletResponseWrapper.java:209)
	at com.sun.facelets.FaceletViewHandler.createResponseWriter(FaceletViewHandler.java:416)
	at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:573)
	at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100)
	at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176)
	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110)
	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
	at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
	at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
	at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:399)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:317)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:204)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:182)
	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:311)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

je n'arrive pas à comprendre

je vous montre la classe bean

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import java.io.IOException;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
 
import javax.faces.context.FacesContext;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
 
import com.lowagie.text.pdf.codec.Base64.OutputStream;
 
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JasperCompileManager;
import net.sf.jasperreports.engine.JasperExportManager;
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.export.JRPdfExporter;
import net.sf.jasperreports.engine.xml.JRXmlLoader;
 
 
public class imprimer {
 
	public imprimer() {
		// TODO Auto-generated constructor stub
	}
public String impri() throws InstantiationException, IllegalAccessException, ClassNotFoundException, JRException, IOException{
 
		try {
 
			// Load the JDBC driver
			 ResultSet res3=null;
				Class.forName("org.gjt.mm.mysql.Driver").newInstance(); 
				 String serverName = "localhost";
				    String mydatabase = "test";
				    String url = "jdbc:mysql://" + serverName +  "/" + mydatabase; // a JDBC url
					 String user = "root"; 
 
			     String pass = "lola1";
 
 
			     java.sql.Connection connection = DriverManager.getConnection(url, user, pass);
					     Statement instruction = ((java.sql.Connection) connection).createStatement();
 
 
					     JasperDesign jDesign = JRXmlLoader.load("C:\\Users\\Mustapha\\workspace\\mus\WebContent\\1.jrxml");
						  			    JasperReport jReport = JasperCompileManager.compileReport(jDesign);
 
 
 
 
 
 
 
 
 
						    JasperPrint jasperPrint = JasperFillManager.fillReport(jReport, null, connection);
 
						    FacesContext facesContext = FacesContext.getCurrentInstance() ;
 
							   facesContext.getExternalContext().getResponse();
							   HttpServletResponse response1 = (HttpServletResponse)facesContext.getExternalContext().getResponse();
							     // Set response content type
							   response1.setContentType("application/pdf");
 
 
						   // Create and export PDF to browser window
						   JRPdfExporter exporter = new JRPdfExporter();
						   System.out.println("salut97");
						   exporter.setParameter(
						   JRExporterParameter.JASPER_PRINT, jasperPrint);
						   exporter.setParameter(JRExporterParameter.OUTPUT_STREAM, response1.getOutputStream());
						   exporter.exportReport();
 
							} catch (SQLException e) {
								// TODO Auto-generated catch block
								e.printStackTrace();
 
 
 
		// JasperExportManager.exportReportToPdfFile(jasperPrint, "C://mustapha.pdf"); 
 
 
 
 
 
			   //JasperViewer.viewReport(jasperPrint,false);
 
 
 
			}return "retour";
}
}