Chart in seam 2.3 appear as html

I need to solve my problem, i am using jasper report 5.6 in seam 2.3 to generate chart but the result is html what should i do?

****My Java Code

import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Timestamp;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import javax.naming.InitialContext;
import javax.sql.DataSource;

import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JRExporter;
import net.sf.jasperreports.engine.JRExporterParameter;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.data.JRBeanCollectionDataSource;
import net.sf.jasperreports.engine.export.HtmlExporter;
import net.sf.jasperreports.engine.export.JRHtmlExporter;
import net.sf.jasperreports.engine.export.JRHtmlExporterParameter;
import net.sf.jasperreports.export.HtmlExporterOutput;
import net.sf.jasperreports.export.SimpleHtmlReportConfiguration;

import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.In;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Scope;
import org.jboss.seam.contexts.Contexts;

import com.twoMinuteOffer.action.SysUserHome;
import com.twoMinuteOffer.model.SysUser;
import com.twoMinuteOffer.report.file.LoadJrxmlFile;

@Name("adminReport")
public class AdminReport {
    
    private String reportString;
    private JasperPrint jasperPrint;
    String serverPath = System.getProperty("jboss.server.base.dir");
    
    public String runAdminReport(){
        
        Connection connection = null;
        
        try {
            
            InitialContext ic = new InitialContext();
            DataSource ds = (DataSource) ic.lookup("java:/TwoMinuteOfferDatasource");
            connection = ds.getConnection();
            
            Map<String, Object> parameters = new HashMap<String, Object>();

            try {
                jasperPrint = JasperFillManager.fillReport(LoadJrxmlFile.getReport("adminReport.jasper"),  parameters
                        ,connection);
            } catch (JRException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            setReportString(executeReportAsHtml(jasperPrint, null));

        } catch (Exception e) {
            e.printStackTrace();
        }
        finally{
            try {
                connection.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        return getReportString();
    }
    
        
    public String executeReportAsHtml(JasperPrint print, String sessionPrintAttributeName) throws Exception{
        
        HtmlExporter exporter = null;
        
        if(sessionPrintAttributeName == null){
            sessionPrintAttributeName = net.sf.jasperreports.j2ee.servlets.ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE;
        }
        StringBuffer sb = new StringBuffer();
        Contexts.getSessionContext().set(sessionPrintAttributeName, print);
        exporter = new HtmlExporter();
        
        exporter.setParameter(JRExporterParameter.OUTPUT_STRING_BUFFER,sb);
        exporter.setParameter(JRExporterParameter.JASPER_PRINT,print);
        exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, "image?image=");
        exporter.exportReport();
        
        String imageURI = "image?time="+System.currentTimeMillis()+"&image=";
        if(sessionPrintAttributeName == null){
            //use default
            sessionPrintAttributeName = net.sf.jasperreports.j2ee.servlets.ImageServlet.DEFAULT_JASPER_PRINT_SESSION_ATTRIBUTE;
            imageURI = "image?time="+System.currentTimeMillis()+"&image=";
        }
        else {
            imageURI = "image?time="+System.currentTimeMillis()+"&jrprint="+sessionPrintAttributeName+"&image=";
        }

        exporter.setParameter(JRHtmlExporterParameter.IMAGES_URI, imageURI);
        return sb.toString();
    }

    public void setReportString(String reportString) {
        this.reportString = reportString;
    }

    public String getReportString() {
        return reportString;
    }
    
}

*****My HTML code

<!DOCTYPE composition PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
    xmlns:s="http://jboss.org/schema/seam/taglib"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:c="http://java.sun.com/jsp/jstl/core"
    xmlns:rich="http://richfaces.org/rich"
    template="layout/template.xhtml">

    <ui:define name="body">
        
        <h:form>
            <s:div>
                #{adminReport.runAdminReport()}
            </s:div>
        </h:form>
        
    </ui:define>
</ui:composition>

please help me...