[jboss-user] [Beginners Corner] - IllegalStateException problem on running jboss

[JBengonsen]

Hi,everybody
    I am using jboss 4.0.5 GA, it generates the following error when i tried to test a ckcodeimage.jsp:
anonymous wrote : 
  | 14:20:15,796 ERROR [[jsp]] Servlet.service() for servlet jsp threw exception
  | java.lang.IllegalStateException: getOutputStream() has already been called for this response
  | 	at org.apache.catalina.connector.Response.getWriter(Response.java:599)
  | 	at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:195)
  | 	at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:124)
  | 	at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:117)
  | 	at org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:182)
  | 	at org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:115)
  | 	at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:75)
  | 	at org.apache.jsp.jsp.ckcodeimage_jsp._jspService(ckcodeimage_jsp.java:133)
  | 	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
  | 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
  | 	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
  | 	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
  | 	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
  | 	at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
  | 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
  | 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  | 	at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
  | 	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
  | 	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  | 	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
  | 	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
  | 	at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
  | 	at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
  | 	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
  | 	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
  | 	at org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)
  | 	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
  | 	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
  | 	at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:833)
  | 	at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:639)
  | 	at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1285)
  | 	at java.lang.Thread.run(Thread.java:595)
  | 
  | 

ckcodeimage.jsp is the following:

  | <%@ page contentType="image/jpeg; charset=GBK" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" %>
  | <%!
  | Color getRandColor(int fc,int bc){//??????????
  |         Random random = new Random();
  |         if(fc>255) fc=255;
  |         if(bc>255) bc=255;
  |         int r=fc+random.nextInt(bc-fc);
  |         int g=fc+random.nextInt(bc-fc);
  |         int b=fc+random.nextInt(bc-fc);
  |         return new Color(r,g,b);
  |         }
  | %>
  | <%
  | //???????
  | response.setHeader("Pragma","No-cache");
  | response.setHeader("Cache-Control","no-cache");
  | response.setDateHeader("Expires", 0);
  | 
  | // ????????
  | int width=60, height=20;
  | BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
  | 
  | // ???????
  | Graphics g = image.getGraphics();
  | 
  | //?????
  | Random random = new Random();
  | 
  | // ?????
  | g.setColor(getRandColor(200,250));
  | g.fillRect(0, 0, width, height);
  | 
  | //????
  | g.setFont(new Font("Times New Roman",Font.PLAIN,18));
  | 
  | //???
  | //g.setColor(new Color());
  | //g.drawRect(0,0,width-1,height-1);
  | 
  | 
  | // ????155???????????????????????
  | g.setColor(getRandColor(160,200));
  | for (int i=0;i<155;i++)
  | {
  | 	int x = random.nextInt(width);
  | 	int y = random.nextInt(height);
  |         int xl = random.nextInt(12);
  |         int yl = random.nextInt(12);
  | 	g.drawLine(x,y,x+xl,y+yl);
  | }
  | 
  | // ?????????(4???)
  | //String rand = request.getParameter("rand");
  | //rand = rand.substring(0,rand.indexOf("."));
  | String sRand="";
  | for (int i=0;i<4;i++){
  |     String rand=String.valueOf(random.nextInt(10));
  |     sRand+=rand;
  |     // ??????????
  |     g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));//???????????????????????????????
  |     g.drawString(rand,13*i+6,16);
  | }
  | 
  | // ??????SESSION
  | session.setAttribute("rand",sRand);
  | 
  | 
  | // ????
  | g.dispose();
  | 
  | // ???????
  | ServletOutputStream output = response.getOutputStream();
  | ImageIO.write(image, "JPEG", output);
  | 
  | %> 
  | 

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