Why doesnt this work??

Question

Hi All,
Im tryin to design a website to take an image out of the database and display it on the jsp page.
I call the image using:
<img src="ImageServlet?id=3" width="250" height="250" align="top">
This calls the servlet that displays the image. The first time i call this the image is displayed. I dont store the image in the session.
My problem is when i click a link to another page and then come back to the original page the image doesnt display. If i refresh the page it wont display. It will display when i manually right click the image and show the picture.
What could be the cause of this. The image is their it just wont display the second time the page is called.
Thanks for any help in advance.

Answer 1

I changed the way the servlet handled the image and got it to print any error instead of throwing them. This is what is coming up.
java.io.IOException: Stream closed
at java.io.BufferedInputStream.ensureOpen(BufferedInputStream.java:120)
at java.io.BufferedInputStream.available(BufferedInputStream.java:336)
at ImageServlet.doGet(ImageServlet.java:36)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:260)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:
2396)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatche
rValve.java:170)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:172)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:22
3)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:405)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ssConnection(Http11Protocol.java:380)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java
:508)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:533)
at java.lang.Thread.run(Thread.java:536)
This is the servlet that generates the error.
import javax.servlet.*;
import javax.servlet.http.*;
import ProductDetails.*;
import java.io.*;
import java.util.*;
import java.awt.image.*;
public class ImageServlet extends HttpServlet {
public void init(ServletConfig config) throws ServletException {
public void destroy() {
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
try
HttpSession session = request.getSession(false);
Product p = (Product) session.getAttribute("prod"+request.getParameter("id")+"");
int i = p.getID();
//if( i == Integer.parseInt(request.getParameter("id")) )
InputStream in = p.getImage();
response.setContentType("image/jpg"); // or whatever type of file it is.
response.setHeader("Cache-Control","no-cache");
response.setHeader("Expires", "0");
response.setHeader("Pragma", "No-cache");
response.addHeader("Cache-control", "no-store"); // tell proxy not to cache
response.addHeader("Cache-control", "max-age=0"); // stale right away
ServletOutputStream sout = response.getOutputStream();
int c;
int b = in.available();
while((c = in.read()) != -1)
sout.write(c);
int imad = 0;
System.out.println("Image called. "+ imad + " Available: " + b);
in.close();
in = null;
sout.flush();
sout.close();
return;
catch (Exception e)
e.printStackTrace();
throw new ServletException(e);
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
doGet(request, response);
Product stores an Inputstream that is gotten from the database.