https://issues.apache.org/bugzilla/show_bug.cgi?id=48088
Summary: Servlet implementing SingleThreadModel are initialized
twice
Product: Tomcat 5
Version: 5.5.28
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
AssignedTo: dev@tomcat.apache.org
ReportedBy: anthony.goub...@wanadoo.nl
When a Servlet implements javax.servlet.SingleThreadModel the method init is
called twice. This should not happen according to the Servlet specification.
http://developer.java.sun.com/developer/onlineTraining/Servlets/Fundamentals/servlets.html#lifeCycle
I first saw the bug when someone tried when someone submitted a bug in my open
source web services framework "xins"
http://sourceforge.net/tracker/?func=detail&aid=2884574&group_id=71598&atid=531814
(bug submitted from Linux with Tomcat 5.5.25)
Here the petstore demo is initialized at the start-up of Tomcat and with the
first request http://localhost:8080/petstore/. This apparently happens on the
same Servlet object.
I've attached the war file that contains removed code so that the Servlet
initializes correctly the first time without looking for a database.
Source code and Demo available at http://xins.sourceforge.net/
I've tried to reproduce it (See code below) and had a slightly different
behaviour:
The init method is called twice but at the first request and it seems to be
done on 2 different objects as the exception is not thrown. The destroy method
is also called twice at the end.
public class SimpleServlet extends HttpServlet implements
javax.servlet.SingleThreadModel {
private boolean initialized = false;
private int initCount = 0;
public void init(ServletConfig config)
throws IllegalArgumentException, ServletException {
if (initialized) {
throw new ServletException("Servlet already initialized. Should not
happen according to the specs.");
}
initialized = true;
System.err.println("------------ Initialized -");
initCount++;
}
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
out.println("SimpleServlet Executed " + initCount);
out.flush();
out.close();
}
public void destroy() {
initialized = false;
System.err.println("------------ destroy");
}
}
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