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Greenhorn

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posted 19 years ago

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Please, can any body help me with this servlet:

import java.util.Vector;
  import java.io.*;
  import javax.servlet.*;
  import javax.servlet.http.*;
 
  public class ListManagerServlet extends HttpServlet
  {
    private Vector addresses;
    private String filename;
 
    public void init(ServletConfig config) throws ServletException
    {
      super.init(config);
      filename = config.getInitParameter("addressfile");
      if(filename == null)
        throw new UnavailableException("The \"addressfile\" property "+
                                        "must be set to a file name");
                                       
      try
      {
        ObjectInputStream in =
          new ObjectInputStream(new FileInputStream(filename));
        addresses = (Vector)in.readObject();
        in.close();
      }
      catch(FileNotFoundException e) { addresses = new Vector(); }
      catch(Exception e)
      {
        throw new UnavailableException("Error reading address file: "+e);
                                       
      }
    }

protected void doGet(HttpServletRequest req,
                         HttpServletResponse resp)
              throws ServletException, IOException
    {
      resp.setContentType("text/html");
      resp.setHeader("pragma", "no-cache");
      PrintWriter out = resp.getWriter();
      out.print("<HTML><HEAD><TITLE>List Manager</TITLE></HEAD>");
      out.print("<BODY><H3>Members:</H3><UL>");
      for(int i=0; i<addresses.size(); i++)
        out.print("<LI>" + addresses.elementAt(i));
      out.print("</UL><HR><FORM METHOD=POST>");
      out.print("Enter your email address: <INPUT TYPE=TEXT NAME=email><BR>");
      out.print("<INPUT TYPE=SUBMIT NAME=action VALUE=subscribe>");
      out.print("<INPUT TYPE=SUBMIT NAME=action VALUE=unsubscribe>");
      out.print("</FORM></BODY></HTML>");
      out.close();
    }
 
    protected void doPost(HttpServletRequest req,
                          HttpServletResponse resp)
              throws ServletException, IOException
    {
      String email = req.getParameter("email");
      String msg;
      if(email == null)
      {
        resp.sendError(HttpServletResponse.SC_BAD_REQUEST,
                      "No email address specified.");
        return;
      }
      if(req.getParameter("action").equals("subscribe"))
      {
        if(subscribe(email))
          msg = "Address " + email + " has been subscribed.";
        else
        {
          resp.sendError(HttpServletResponse.SC_BAD_REQUEST,
                        "Address " + email + " was already subscribed.");
          return;
        }
      }
      else
      {
        if(unsubscribe(email))
          msg = "Address " + email + " has been removed.";
        else
        {
          resp.sendError(HttpServletResponse.SC_BAD_REQUEST,
                        "Address " + email + " was not subscribed.");
          return;
        }
      }
 
      resp.setContentType("text/html");
      resp.setHeader("pragma", "no-cache");
      PrintWriter out = resp.getWriter();
      out.print("<HTML><HEAD><TITLE>List Manager</TITLE></HEAD><BODY>");
      out.print(msg);
      out.print("<HR><A HREF=\"");
      out.print(req.getRequestURI());
      out.print("\">Show the list</A></BODY></HTML>");
      out.close();
    }
 
    public String getServletInfo()
    {
      return "ListManagerServlet 1.0 by Stefan Zeiger";
    }
 
    private synchronized boolean subscribe(String email) throws IOException
    {
      if(addresses.contains(email)) return false;
      addresses.addElement(email);
      save();
      return true;
    }
 
    private synchronized boolean unsubscribe(String email) throws IOException
    {
      if(!addresses.removeElement(email)) return false;
      save();
      return true;
    }
 
    private void save() throws IOException
    {
      ObjectOutputStream out =
        new ObjectOutputStream(new FileOutputStream(filename));
      out.writeObject(addresses);
      out.close();
    }
  }

By the way I'm using Eclipse 3.0.2 and Tomcat 5.5, and with the rest of the servlets in the same package I don't have any problem.
Thanks!

Marilyn de Queiroz

Sheriff

Posts: 9109

posted 19 years ago

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Originally posted by Slavko Glisic:
Please, can any body help me with this servlet:

...

By the way I'm using Eclipse 3.0.2 and Tomcat 5.5, and with the rest of the servlets in the same package I don't have any problem.
Thanks!

What problem are you having with this servlet?

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Slavko Glisic

Greenhorn

Posts: 14

posted 19 years ago

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It shows that Servlet does not exist:
HTTP Status 404 - Servlet ListManagerServlet is not available
but I set everything same like for the other servlets from the package(I mean web.xml)

Tim Baker

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posted 19 years ago

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That is a very general error, check your tomcat logs to see what is going on.

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Slavko Glisic

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posted 19 years ago

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Tim thanks for your reply, but I still don't found out what is going on!
I've found in log smthg like "INFO: Marking servlet ListManagerServlet as unavailable".

Bear Bibeault

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posted 19 years ago

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"INFO: Marking servlet ListManagerServlet as unavailable".

What about before that? The container is marking the servlet as unavailable for a reason -- usually because an exception was thrown while loading it.

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Slavko Glisic

Greenhorn

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posted 19 years ago

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But I realy cannot find it :-((!

This is all what it show me:

Jul 6, 2005 5:15:05 PM org.apache.coyote.http11.Http11Protocol init
INFO: Initializing Coyote HTTP/1.1 on http-8080
Jul 6, 2005 5:15:05 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 2714 ms
Jul 6, 2005 5:15:06 PM org.apache.catalina.core.StandardService start
INFO: Starting service Catalina
Jul 6, 2005 5:15:06 PM org.apache.catalina.core.StandardEngine start
INFO: Starting Servlet Engine: Apache Tomcat/5.5.9
Jul 6, 2005 5:15:06 PM org.apache.catalina.core.StandardHost start
INFO: XML validation disabled
Jul 6, 2005 5:15:07 PM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-8080
Jul 6, 2005 5:15:07 PM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:8009
Jul 6, 2005 5:15:07 PM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/80 config=null
Jul 6, 2005 5:15:07 PM org.apache.catalina.storeconfig.StoreLoader load
INFO: Find registry server-registry.xml at classpath resource
Jul 6, 2005 5:15:07 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 2023 ms
Jul 6, 2005 5:15:26 PM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: init: Associated with Deployer 'Catalina:type=Deployer,host=localhost'
Jul 6, 2005 5:15:26 PM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: init: Global resources are available
Jul 6, 2005 5:15:26 PM org.apache.catalina.core.ApplicationContext log
INFO: HTMLManager: list: Listing contexts for virtual host 'localhost'
Jul 6, 2005 5:15:49 PM org.apache.catalina.core.ApplicationContext log
INFO: Marking servlet ListManagerServlet as unavailable

Slavko Glisic

Greenhorn

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posted 19 years ago

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But, thanx anyway!

William Brogden

Author and all-around good cowpoke

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posted 19 years ago

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Your servlet is not in a package - this is probably preventing the class file from being found.
Bill

Slavko Glisic

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posted 19 years ago

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Thks Bill, but I think that's not a problem 'coz all other works well from the same package(default package), and I was set it in web.xml file, like the others...
i feel sicK!

Sonny Gill

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posted 19 years ago

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Originally posted by Slavko Glisic:
Please, can any body help me with this servlet:

if(filename == null) throw new UnavailableException("The \"addressfile\" property "+ "must be set to a file name"); try { ObjectInputStream in = new ObjectInputStream(new FileInputStream(filename)); addresses = (Vector)in.readObject(); in.close(); } catch(FileNotFoundException e) { addresses = new Vector(); } catch(Exception e) { throw new UnavailableException("Error reading address file: "+e); }

Are you sure that an exception is not being thrown by your code in init? Althought normally I would expect any exceptions thrown to show up on the logs, try adding some logging statements (System.out.println) before the throw statements.

William Brogden

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posted 19 years ago

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Now that I think about Sonny's suggestion - the only way you can get a not available message that I know of is if the NotAvailableException is thrown.
So it is likely that your web.xml is not providing the addressfile parameter.
Trying to debug servlets that are not put in packages is a hopeless task - thats what years of experience on this and other forums has shown. Just go ahead and bite the bullet - learn how to use packages and pay close attention to the correct form of web.xml. Also - do NOT use the /servlet/ form of URL addressing that requires the use of the "invoker" servlet.
Bill

Slavko Glisic

Greenhorn

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posted 19 years ago

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Thanks Sonny, Bill
Really I'm still new in servlets and I really want to bite the bullet, I don't expect to somebody make job for me, any way this is just one example what I trying to work...
I know that is best way for learning is go inside and try to fix what is the problem, but like I'm said all the other servlet behave normal except this one... b.t.w. this how looks my web.xml
Regards!

<?xml version="1.0" encoding="UTF-8"?>
 
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN" "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
 
<web-app>

<servlet>
 
    <servlet-name>SimpleServlet</servlet-name>
 
    <servlet-class>SimpleServlet</servlet-class>
 
  </servlet>
 
  <servlet-mapping>
 
    <servlet-name>SimpleServlet</servlet-name>
 
    <url-pattern>/SimpleServlet</url-pattern>
 
  </servlet-mapping>
 
  <servlet>
 
    <servlet-name>HelloSlavko</servlet-name>
 
    <servlet-class>HelloSlavko</servlet-class>
 
  </servlet>
 
  <servlet-mapping>
 
    <servlet-name>HelloSlavko</servlet-name>
 
    <url-pattern>/HelloSlavko</url-pattern>
 
  </servlet-mapping>
  
    <servlet>
 
    <servlet-name>ServerSnoop</servlet-name>
 
    <servlet-class>ServerSnoop</servlet-class>
 
  </servlet>
 
  <servlet-mapping>
 
    <servlet-name>ServerSnoop</servlet-name>
 
    <url-pattern>/ServerSnoop</url-pattern>
 
  </servlet-mapping>
  
  <servlet>
 
    <servlet-name>ListManagerServlet</servlet-name>
 
    <servlet-class>ListManagerServlet</servlet-class>
 
  </servlet>
 
  <servlet-mapping>
 
    <servlet-name>ListManagerServlet</servlet-name>
 
    <url-pattern>/ListManagerServlet</url-pattern>
 
  </servlet-mapping>
  
   <servlet>
 
    <servlet-name>Zika</servlet-name>
 
    <servlet-class>Zika</servlet-class>
 
  </servlet>
 
  <servlet-mapping>
 
    <servlet-name>Zika</servlet-name>
 
    <url-pattern>/Zika</url-pattern>
 
  </servlet-mapping> 
  
  
    
   <servlet>
 
    <servlet-name>CurrentTime</servlet-name>
 
    <servlet-class>CurrentTime</servlet-class>
 
  </servlet>
 
  <servlet-mapping>
 
    <servlet-name>CurrentTime</servlet-name>
 
    <url-pattern>/CurrentTime</url-pattern>
 
  </servlet-mapping>
  
</web-app>

Shailesh Chandra

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posted 19 years ago

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filename = config.getInitParameter("addressfile");

where is init-param for parameter addressfile in your web.xml ???

Shailesh

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Slavko Glisic

Greenhorn

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posted 19 years ago

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That's it Shailesh, thanks a lot.
I must learn more about servlet deploying...
Just another question why in the log file this doesn't show me that exception is thrown?

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