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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=6234 checkError method of Servlet's PrintWriter is unreliable Summary: checkError method of Servlet's PrintWriter is unreliable Product: Tomcat 3 Version: 3.3 Final Platform: Other OS/Version: Windows NT/2K Status: NEW Severity: Minor Priority: Other Component: Servlet AssignedTo: [EMAIL PROTECTED] ReportedBy: [EMAIL PROTECTED] Tomcat appears to be recycling PrintWriters. After a particular PrintWriter's checkError() method returns true, it always returns true (even after it is recycled). I submitted this as a minor bug since there is a simple workaround (just use getOutputStream()). The problem can be demonstrated using the following servlet: /** * To use this test: * * Hit the servlet with a browser. "Sending Data" messages will be printed to * the brower window at a rate of one per second. Hit the stop button on your * browser (causing checkError() to return true). Repeat this until you get * a response where out.checkError() equals true before any data is sent * (it should only take about 5 tries). This is the problem. * * From looking at the hashCodes, it looks like the PrintWriters are being * recycled and the checkError flag on these printWriters are never being * reset. * * Notice that this problem does not occur when using * response.getOutputStream(). */ public class TestServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); // Simple workaround. Servlet will work correctly if following line is // used instead. //PrintWriter out = new PrintWriter(response.getOutputStream()); out.println("Entering Servlet:<BR>"); out.println("<ul><li>out.hashCode(): " + out.hashCode() + "</li>"); out.println("<li>out.checkError(): " + out.checkError() + "</li></ul>"); while (!out.checkError()) { try {Thread.currentThread().sleep(1000);} catch (Exception e) {} out.println("Sending Data<BR>"); } } } -- To unsubscribe, e-mail: <mailto:[EMAIL PROTECTED]> For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>
