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POTomcat, Comet and getOutputStream() has already been called for this response
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  1. POTomcat, Comet and getOutputStream() has already been called for this response
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    copied!<p>I am using Tomcat 6.0.32 with the Http11NioProtocol connector to implement long polling.</p> <p>My comet processor is holding the <code>HttpSevletResponse</code> on a queue until an event is ready to send back. When it sends back the event it is writing a binary stream to an applet, so I use <code>response.getOutputStream().write()</code> to send data back. When writing to the stream it is synchronized.</p> <p>When another web page in a second frame reloads (Independent JSP generated from SpringController in same container) occasionally I see this in the logs and the page fails to load.</p> <p>Is it possible there is a concurrency error between a response generated from a comet processor and a regular servlet when both are requested at the same time?</p> <p>The stack trace:</p> <pre><code>java.lang.IllegalStateException: getOutputStream() has already been called for this response at org.apache.catalina.connector.Response.getWriter(Response.java:611) at org.apache.catalina.connector.ResponseFacade.getWriter(ResponseFacade.java:198) at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:112) at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:112) at javax.servlet.ServletResponseWrapper.getWriter(ServletResponseWrapper.java:112) at org.apache.jasper.runtime.JspWriterImpl.initOut(JspWriterImpl.java:125) at org.apache.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:118) at org.apache.jasper.runtime.PageContextImpl.release(PageContextImpl.java:180) at org.apache.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:118) at org.apache.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:77) at org.apache.jsp.WEB_002dINF.jsp.sale_jsp._jspService(sale_jsp.java:96) </code></pre>
 

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