>From my observation, <form action="/sign" method="post"> in guestbook.jsp is expected to trigger doPost method in SignGuestBookServlet but instead, it invoks doGet method in GuestbookServlet as it's the first servlet defined in web.xml. Thus, it causes the error message like HTTP method POST is not supported by this URL.
I have been working on this issue for hours and finally I made it worked but I have to delete the servlet guestbook from entries in <servlet/> and <servlet-mapping/> in web.xml. But in tutorial, it didn't mention the deletion. It also works if I moved up the servlet sign to the first entry. I don't understand why it behaves like this. It looks to me that doGet method in GuestbookServet other than doPost method in SignGuestbookServlet gets invoked immediately after a user clicks Post Greetings, which posts data in the form. Is there a order requirement in <servlet/> element? Or should only one servlet defined in this section? Anyone know how does invocation make on servlets in section of <servlet/> and <servlet-mapping/> in web.xml ? Does invocation go through chains of servlet? After deletion, web.xml now looks like below: <?xml version="1.0" encoding="utf-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xmlns="http://java.sun.com/xml/ns/javaee"; xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"; xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"; version="2.5"> <servlet> <servlet-name>sign</servlet-name> <servlet-class>guestbook.SignGuestbookServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>sign</servlet-name> <url-pattern>/sign</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>guestbook.jsp</welcome-file> </welcome-file-list> </web-app> On Fri, Apr 16, 2010 at 12:42 PM, bosun <david.bo...@gmail.com> wrote: > Hi Chau, > I used the code in the tutorial with a slightly change. Data is posted by > POST method in the form so SignGuestbookServlet should use doPost to handle > it. > Anothe thing I am confused is that I can't see log message in Eclipse > console if I added custom message like log.info or system.out.printlin > alough I givie guestbook.level = INFO in logging.properties. > > Code below is SignGuestbookServlet.java: > import com.google.appengine.api.users.UserService; > import com.google.appengine.api.users.UserServiceFactory; > public class SignGuestbookServlet { > private static final Logger log = > Logger.getLogger(SignGuestbookServlet.class.getName()); > > public void doPost(HttpServletRequest req, HttpServletResponse resp) > throws IOException { > UserService userService = UserServiceFactory.getUserService(); > User user = userService.getCurrentUser(); > > String content = req.getParameter("content"); > if (content == null) { > content = "(No greeting)"; > } > if (user != null) { > log.info("Greeting posted by user " + user.getNickname() + ": > " + content); > } else { > log.info("Greeting posted anonymously: " + content); > } > resp.sendRedirect("/guestbook.jsp"); > } > } > Code below is guestbook.jsp: > > <%@ page contentType="text/html;charset=UTF-8" language="java" %> > <%@ page import="com.google.appengine.api.users.User" %> > <%@ page import="com.google.appengine.api.users.UserService" %> > <%@ page import="com.google.appengine.api.users.UserServiceFactory" %> > <html> > <body> > <% > UserService userService = UserServiceFactory.getUserService(); > User user = userService.getCurrentUser(); > if (user != null) { > %> > <p>Hi, <%= user.getNickname() %>! (You can > <a href="<%= userService.createLogoutURL(request.getRequestURI()) %>">sign > out</a>.)</p> > <% > } else { > %> > <p>Hello! > <a href="<%= userService.createLoginURL(request.getRequestURI()) %>">Sign > in</a> > to include your name with greetings you post.</p> > <% > } > %> > Comment Board: > <form action="/sign" method="post"> > <div><textarea name="content" rows="3" cols="60"></textarea></div> > <div><input type="submit" value="Post Greeting" /></div> > </form> > </body> > </html> > > code below is GuestbookServlet.java: > package guestbook; > import java.io.IOException; > import javax.servlet.http.*; > import com.google.appengine.api.users.User; > import com.google.appengine.api.users.UserService; > import com.google.appengine.api.users.UserServiceFactory; > > @SuppressWarnings("serial") > public class GuestbookServlet extends HttpServlet { > public void doGet(HttpServletRequest req, HttpServletResponse resp) throws > IOException { > UserService userService = UserServiceFactory.getUserService(); > User user = userService.getCurrentUser(); > //log.info("user name is " + user.getNickname()); > if (user != null) { > resp.setContentType("text/plain"); > resp.getWriter().println("Hello, " + user.getNickname()); > } else { > > resp.sendRedirect(userService.createLoginURL(req.getRequestURI())); > } > } > } > > On Fri, Apr 16, 2010 at 12:16 PM, Chau Huynh <cmhu...@gmail.com> wrote: > >> And next you'll need to post your servlet ;-) >> >> Just wonder if you code SignGuestbookServlet servlet yourself - in such a >> case, you might code doGet() while your JSP posts to the servlet? Error >> message from your post: "HTTP method POST is not supported by this URL" >> >> >> On Fri, Apr 16, 2010 at 10:59 PM, bosun <david.bo...@gmail.com> wrote: >> >>> Hi Rajeev, >>> >>> Thank you for helping me troubleshooting this issue. >>> >>> Below is web.xml >>> >>> <?xml version="1.0" encoding="utf-8"?> >>> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; >>> xmlns="http://java.sun.com/xml/ns/javaee"; >>> xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"; >>> xsi:schemaLocation="http://java.sun.com/xml/ns/javaee >>> http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"; version="2.5"> >>> <servlet> >>> <servlet-name>Guestbook</servlet-name> >>> <servlet-class>guestbook.GuestbookServlet</servlet-class> >>> <servlet-name>sign</servlet-name> >>> <servlet-class>guestbook.SignGuestbookServlet</servlet-class> >>> </servlet> >>> <servlet-mapping> >>> <servlet-name>Guestbook</servlet-name> >>> <url-pattern>/guestbook</url-pattern> >>> <servlet-name>sign</servlet-name> >>> <url-pattern>/sign</url-pattern> >>> </servlet-mapping> >>> <welcome-file-list> >>> <welcome-file>guestbook.jsp</welcome-file> >>> </welcome-file-list> >>> </web-app> >>> >>> below is appengine-web.xml >>> >>> <?xml version="1.0" encoding="utf-8"?> >>> <appengine-web-app xmlns="http://appengine.google.com/ns/1.0";> >>> <application></application> >>> <version>1</version> >>> >>> <!-- Configure java.util.logging --> >>> <system-properties> >>> <property name="java.util.logging.config.file" >>> value="WEB-INF/logging.properties"/> >>> </system-properties> >>> >>> </appengine-web-app> >>> >>> >>> >>> >>> On Fri, Apr 16, 2010 at 10:29 AM, Rajeev Dayal <rda...@google.com>wrote: >>> >>>> Can you post the contents of your web.xml file and your >>>> appengine-web.xml file? >>>> >>>> On Thu, Apr 15, 2010 at 10:21 PM, bosun <david.bo...@gmail.com>wrote: >>>> >>>>> I forgot mention in my post about the version of Eclipse I am using >>>>> is Galileo. I downloaded Google plugin for this version. >>>>> >>>>> The link to the Tutorial where I am stuck on is: >>>>> http://code.google.com/intl/en/appengine/docs/java/gettingstarted/usingjsps.html >>>>> >>>>> In Eclipse console, all log messages after server restarted are like >>>>> below: >>>>> >>>>> Apr 16, 2010 2:05:54 AM >>>>> com.google.apphosting.utils.config.AppEngineWebXmlReader >>>>> readAppEngineWebXml >>>>> INFO: Successfully processed >>>>> C:\EclipseGalileo\workspace\Guestbook\war\WEB-INF/appengine-web.xml >>>>> Apr 16, 2010 2:05:54 AM >>>>> com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml >>>>> INFO: Successfully processed >>>>> C:\EclipseGalileo\workspace\Guestbook\war\WEB-INF/web.xml >>>>> The server is running at http://localhost:8888/ >>>>> Apr 16, 2010 2:07:08 AM >>>>> com.google.appengine.tools.development.LocalResourceFileServlet doGet >>>>> WARNING: No file found for: /favicon.ico >>>>> Apr 16, 2010 2:07:25 AM >>>>> com.google.appengine.tools.development.LocalResourceFileServlet doGet >>>>> WARNING: No file found for: /favicon.ico >>>>> >>>>> Please advise where it goes wrong. >>>>> >>>>> Thanks! >>>>> >>>>> >>>>> On Thu, Apr 15, 2010 at 9:57 PM, bobo <david.bo...@gmail.com> wrote: >>>>> >>>>>> Hi >>>>>> >>>>>> I run Google App Engine (Java) locally with Eclipse. Following the >>>>>> tutorial of Getting Started - Java, I lean it step by step and my >>>>>> local server works well until the section Using JSPs. After adding >>>>>> SignGuestbookServlet.java and greeting form in guestbook.jsp as well >>>>>> as editing web.xml for servlet mapping for sign and /sign, I >>>>>> restarted the server. My browser displayed error message immediately >>>>>> after I tried to post a greeting message: >>>>>> >>>>>> HTTP ERROR 405 >>>>>> Problem accessing /sign. Reason: HTTP method POST is not supported >>>>>> by this URL >>>>>> >>>>>> In Eclipse console, the red error message like: >>>>>> Apr 16, 2010 1:34:31 AM >>>>>> com.google.appengine.tools.development.LocalResourceFileServlet doGet >>>>>> WARNING: No file found for: /favicon.ico >>>>>> >>>>>> I googled this error but seems no one having this problem before. I >>>>>> am stuck on this point and anyone who can shed me a light? >>>>>> >>>>>> Thanks! >>>>>> >>>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Google App Engine for Java" group. >>>>> To post to this group, send email to >>>>> google-appengine-j...@googlegroups.com. >>>>> To unsubscribe from this group, send email to >>>>> google-appengine-java+unsubscr...@googlegroups.com<google-appengine-java%2bunsubscr...@googlegroups.com> >>>>> . >>>>> For more options, visit this group at >>>>> http://groups.google.com/group/google-appengine-java?hl=en. >>>>> >>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Google App Engine for Java" group. >>>> To post to this group, send email to >>>> google-appengine-j...@googlegroups.com. >>>> To unsubscribe from this group, send email to >>>> google-appengine-java+unsubscr...@googlegroups.com<google-appengine-java%2bunsubscr...@googlegroups.com> >>>> . >>>> For more options, visit this group at >>>> http://groups.google.com/group/google-appengine-java?hl=en. >>>> >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "Google App Engine for Java" group. >>> To post to this group, send email to >>> google-appengine-j...@googlegroups.com. >>> To unsubscribe from this group, send email to >>> google-appengine-java+unsubscr...@googlegroups.com<google-appengine-java%2bunsubscr...@googlegroups.com> >>> . >>> For more options, visit this group at >>> http://groups.google.com/group/google-appengine-java?hl=en. >>> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Google App Engine for Java" group. >> To post to this group, send email to >> google-appengine-j...@googlegroups.com. >> To unsubscribe from this group, send email to >> google-appengine-java+unsubscr...@googlegroups.com<google-appengine-java%2bunsubscr...@googlegroups.com> >> . >> For more options, visit this group at >> http://groups.google.com/group/google-appengine-java?hl=en. >> > > -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. 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