could not initial my servlet
sabar May 28, 2003 7:41 PMHi
pls tell me why when run my servlet, JBoss could not
read my message in init()
i made the following steps
1- write my servlet
package coreservlets;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
/** Example using servlet initialization. Here, the message
* to print and the number of times the message should be
* repeated is taken from the init parameters.
*/
public class ShowMessage extends HttpServlet {
private String message;
private String defaultMessage = "No message.";
private int repeats = 1;
public void init(ServletConfig config)
throws ServletException {
// Always call super.init
super.init(config);
message = config.getInitParameter("message");
if (message == null) {
message = defaultMessage;
}
try {
String repeatString = config.getInitParameter("repeats");
repeats = Integer.parseInt(repeatString);
} catch(NumberFormatException nfe) {
// NumberFormatException handles case where repeatString
// is null *and* case where it is something in an
// illegal format. Either way, do nothing in catch,
// as the previous value (1) for the repeats field will
// remain valid because the Integer.parseInt throws
// the exception *before* the value gets assigned
// to repeats.
}
}
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String title = "The ShowMessage Servlet";
out.println(ServletUtilities.headWithTitle(title) +
"<BODY BGCOLOR=\"#FDF5E6\">\n" +
"<H1 ALIGN=CENTER>" + title + "</H1>");
for(int i=0; i<repeats; i++) {
out.println(message + "");
}
out.println("");
}
}
2- web.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<display-name>PutHereTheNameOfYourWebApp</display-name>
This a description of my web app made by Eclipse
<servlet-name>ShowMessage</servlet-name>
<display-name>This is the display name of my J2EE component</display-name>
This is the description of my J2EE component
<servlet-class>coreservlets.ShowMessage</servlet-class>
<servlet-mapping>
<servlet-name>ShowMessage</servlet-name>
<url-pattern>/servlet/ShowMessage</url-pattern>
</servlet-mapping>
<init-param>
<param-name>
message
</param-name>
<param-value>
Shibboleth
</param-value>
</init-param>
<init-param>
<param-name>
repeats
</param-name>
<param-value>
5
</param-value>
</init-param>
<welcome-file-list>
<welcome-file>/servlet/ShowMessage</welcome-file>
</welcome-file-list>
</web-app>