org.apache.jasper.JasperException: getOutputStream() has already been called for this response

<jsp:useBean id="utility" class="beans.UtilityBean" scope="request"/>
<%@ page errorPage="errorPage.jsp" %>
<%@ page import="java.sql.*, java.text.*, java.util.*, java.io.*" %>
<%@ include file="setting.jsp" %>
 
<%
	//////////////////////////////////////////////////
	// 1. Some variables declaration.
	//////////////////////////////////////////////////
	// Key is constructed from username, password, and market requested.
	String key = "";	String user = "";	String password = "";	String market = "";	
 
	String feed = "Z";	String username = request.getRemoteUser(); 
 
	//////////////////////////////////////////////////
	// 2. Check for the key sent by user.
	//////////////////////////////////////////////////
	if ( request.getParameter("key") == null )
	{
		response.sendRedirect("invalidAccess.jsp?error=Pleas specify a key");
		return;
	}
	else
	{
		key = request.getParameter("key");
		String[] tokens = key.split(",");
		// Key should have a length of 3. It is constructed from 
		// username, password, and market requested.
		if ( tokens.length != 2 )
		{
			response.sendRedirect("invalidAccess.jsp?error=There is a problem");
			return;
		}
		else
		{
			user = tokens[0];
			password = "test";
			market = tokens[1];
		}
	} 
%>
 
<%
	if ( username == null )
	{
		response.sendError(HttpServletResponse.SC_UNAUTHORIZED,"Unauthorized");
	}	
	else
	{
 
	//////////////////////////////////////////////////
	// 3. If the key is okay, then try to 
	//    check the login using LMS system.
	//    In this case, it's the LoginBean.java.
	//////////////////////////////////////////////////
	String loginResult = utility.login(user, username, password, market, feed);
 
	if ( !loginResult.equals("OK") )
	{
		// Does not "return;" since it needs do do "utility.closeConnection();" below
		response.sendRedirect("invalidAccess.jsp?error=" + loginResult);
	}
	else
	{
		//////////////////////////////////////////////////
		// Get the zip file.
		//////////////////////////////////////////////////
		String filename = utility.getZipFileLocation(user, username, market, feed);
 
		File myFile = new File(getServletContext().getRealPath(filename)); 
 
		java.util.Date myFileDate = new java.util.Date(myFile.lastModified());
       	TimeZone tz = TimeZone.getTimeZone("GMT:00");
         	SimpleDateFormat dfGMT = new SimpleDateFormat("E, dd MMM yyyy HH:mm:ss z");
           	dfGMT.setTimeZone( tz ); 
 
		BufferedInputStream in = new BufferedInputStream(
			getServletContext().getResourceAsStream(filename));
	
		response.setContentType(getServletContext().getMimeType(filename));
		response.setHeader ("Content-Disposition", "attachment;filename=" + filename.replaceFirst(".+/(.+)", "$1"));
		response.setHeader("Last-Modified", dfGMT.format(myFileDate));	
		
		ServletOutputStream servletOutputStream = response.getOutputStream();
    	byte[] buffer = new byte[4 * 1024];
 
    	int data;
    	while((data = in.read(buffer)) != -1)
    	{
    		servletOutputStream .write(buffer, 0, data);
    	}
    	servletOutputStream .flush();		
    	servletOutputStream .close();
    	
	}
 
	utility.closeConnection();
 
	} // end else if ( username != null )
%>

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<%
	String VARIABLE_NAME = 
		"/directoryA/directoryB/....";
%>

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<jsp:useBean id="utility" class="beans.UtilityBean" scope="request"/><%@ page errorPage="errorPage.jsp" import="java.sql.*, java.text.*, java.util.*, java.io.*" %><%
 put your scriptlet content here  
%>   

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out.clear();
out = pageContext.pushBody(); 

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