embeded FOP in JSP ( tomcat problem)

[Se-yong, Um]

I coded embeded FOP in JSP on resin 1.2.7, long time ago, it works well.   But same code do not work on tomcat 3.2.2, 3.2.1, 3.1.1, 4.0b5       Result of FOP is "ByteArrayOutputStream content".     My code:   .... fop embeding ... response.setContentType("application/octet-stream"); // always download response.setHeader("Content-Disposition", "attachment; filename=\"samples.rtf\""); // set a file name response.setContentLength(content.size()); // Specity ContentLength, If not present, MSIE request 3 times to determine ContentLength response.getOutputStream().write(content.toByteArray());   // End of JSP       A java.lang.IllegalStateException(OutputStream is already being used for this request) thrown before end of jsp.   Response file downloaded, exception string follow normal pdf. looks below.     %PDF-1.3 ... normal pdf ... %%EOF <h1>Error: 500</h1> <h2>Location: /eduplan.jsp</h2><b>Internal Servlet Error:</b><br> <pre> java.lang.IllegalStateException: OutputStream is already being used for this request  at org.apache.tomcat.core.ResponseImpl.getWriter(ResponseImpl.java:210)  at org.apache.tomcat.core.HttpServletResponseFacade.getWriter(HttpServletResponseFacade.java:148)  at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:154)  at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:146)  at org.apache.jasper.runtime.JspWriterImpl.flush(JspWriterImpl.java:191)  at _0002feduplan_0002ejspeduplan_jsp_0._jspService(_0002feduplan_0002ejspeduplan_jsp_0.java:256)  at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:126)  at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)  at org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.java:174)  at org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java:261)  at org.apache.jasper.runtime.JspServlet.service(JspServlet.java:369)  at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)  at org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java:503)  at org.apache.tomcat.core.ContextManager.service(ContextManager.java:559)  at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:160)  at org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java:338)  at java.lang.Thread.run(Thread.java:484) </pre>     What is wrong??? Why happen this? How can I resolve this?   -- Se-yong, Um Republic of Korea