Ricardo What can I say ... sometimes you just get a mental block about these things
I used a servlet and now I don't get any java.lang.IllegalStateExceptions when loading images Thank you for showing me the light. Regards Duncan On 7/3/07, rpr_listas <[EMAIL PROTECTED]> wrote:
Hi Lyallex! You're getting a OutputStream ftrom a JSP? If the JSP has a simple single empty line before your java code <%%>, the JSP framework get a writer before your java code is executred. This is the cause of the IllegalState Exception. The rigth way to do this is from a servlet, but if you prefer still using JSP, clean any empty space before your java code. This code probably fails: <[EMAIL PROTECTED] import ..> <[EMAIL PROTECTED] ... > <% //my java code %> EOF An this avoid the problem: <%page ....><% //my java code //other java line %>EOF Best regards. Ricardo Lyallex escribió: > Hi > > I'm not sure this is a Tomcat question, more likely a poor > understanding of > the Request/Response lifecycle on my part but I'll give it a go anyway. > > After agonising for days(weeks) over whether to store my images in a > database or on the filesystem I opted for the database. > > I have everything working fine ... apart from one little niggling > thing that > I just cannot figure out. > > Every time I get an image from the database I get an exception > > java.lang.IllegalStateException: getOutputStream() has already been > called > for this response ... > > Now I think I understand why this is happening, I read somewhere that you > cannot get a JspWriter (via a call to the implicit object out for > example) > and a binary output stream > (ServletOutputStream outStream = response.getOutputStream ()) from the > same > response. Nothing falls over and the images appear fine. It's really the > exception traces I'm trying to get rid of > > It appears that others are also using a database to store images and have > things working. > (mainly from http://marc.info/?l=tomcat-user) > > Can anyone advise me as to how to write both text and image data out > to the > same response without this exception clogging up all my log files ? > > I have included code below if you want/need to read it > > Many thanks > Duncan > > > //============== get an image in a jsp ============= > //where p is a Product Object that contains information on the image > name as > stored in the database > //images can be thumbnails or normal size > > <img > src="imageproxy.jsp?imageid=<%=p.calculateImageId()%>&imagetype=thumb" > width='80'> > > //============== imageproxy.jsp ================ > //where ImageServer is a singleton that gets an InputStream on a MySQL > database BLOB > > boolean DEBUG = false; > > ServletOutputStream outStream = response.getOutputStream(); > > response.reset(); > response.setHeader("Expires", "-1"); > response.setHeader("Cache-Control", "no-cache"); > > String imageId = request.getParameter (imageid); > String imageType = request.getParameter(imagetype); > > ImageServer images = ImageServer.getServer(); > InputStream inStream = images.getImageData(imageId, imageType); > > if(DEBUG){ > System.out.println("imageproxy.jsp, inStream has " + > inStream.available() + " bytes available"); > } > > byte[] bytes = new byte[1000]; > int bytesRead = inStream.read(bytes); > while (bytesRead != -1) { > outStream.write(bytes,0,bytesRead); > bytesRead = inStream.read(bytes); > } > outStream.flush (); > inStream.close(); > > //============= Just FYI here is the trace (one per image) ============= > > SEVERE: 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:191) > at > org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext ( > JspFactoryImpl.java:115) > at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext( > JspFactoryImpl.java:75) > at > org.apache.jsp.imageproxy_jsp._jspService(imageproxy_jsp.java:94) > at org.apache.jasper.runtime.HttpJspBase.service ( HttpJspBase.java > :97) > at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) > at org.apache.jasper.servlet.JspServletWrapper.service( > JspServletWrapper.java:332) > 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:802) > at > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter( > ApplicationFilterChain.java:252) > 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.apache.catalina.authenticator.AuthenticatorBase.invoke( > AuthenticatorBase.java:432) > at org.apache.catalina.core.StandardHostValve.invoke ( > StandardHostValve.java:126) > at org.apache.catalina.valves.ErrorReportValve.invoke( > ErrorReportValve.java:105) > 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.Http11Processor.process( > Http11Processor.java:869) > at > org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection ( > > Http11BaseProtocol.java:664) > at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket( > PoolTcpEndpoint.java:527) > at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt( > LeaderFollowerWorkerThread.java :80) > at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run( > ThreadPool.java:684) > at java.lang.Thread.run(Thread.java:595) > --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
