This question already has answers here:
Servlet returns "HTTP Status 404 The requested resource (/servlet) is not available"
(19 answers)
Closed 6 years ago.
filter
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.*;
public class MyFilter implements Filter{
#Override
public void init(FilterConfig arg0) throws ServletException {}
#Override
public void doFilter(ServletRequest req, ServletResponse resp,
FilterChain chain) throws IOException, ServletException {
PrintWriter out=resp.getWriter();
out.print("filter is invoked before");
chain.doFilter(req, resp);//sends request to next resource
out.print("filter is invoked after");
}
public void destroy() {}
}
servlet
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.*;
public class HelloServlet extends HttpServlet {
#Override
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.print("<br>welcome to servlet<br>");
}
}
web.xml
<web-app>
<servlet>
<servlet-name>HelloServlet</servlet-name>
<servlet-class>HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloServlet</servlet-name>
<url-pattern>/HelloServlet</url-pattern>
</servlet-mapping>
<filter>
<filter-name>MyFilter</filter-name>
<filter-class>MyFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>MyFilter</filter-name>
<url-pattern>/servlet1</url-pattern>
</filter-mapping>
</web-app>
index.html
click here
error is :
HTTP Status 404 - Not Found
type Status report
messageNot Found
descriptionThe requested resource is not available.
GlassFish Server Open Source Edition 4.0
I have given entire code plz help me find my error
in am new to sevlet
question may sound dumb but plz help me
HTTP Status 404 - Not Found
because your servlet is mapped to /HelloServlet and your filter is trying to intercept servlet1 . since there is no servlet at servlet1 , container says no resource found.
change your filter mapping to /HelloServlet and click here.
Try to change this:
click here
With:
click here
Related
I want to create programmatically a Filter in Java EE 8 from Java Code, so I did this code in my application.
Gif captures: gif capture one - gif capture two
My filter is LoginFilter.java
package afrominga.filters;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;
#WebFilter
public class LoginFilter implements Filter {
#Override
public void init(FilterConfig filterConfig) throws ServletException {
System.out.println("Hello from LoginFilter.");
}
#Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
System.out.println("I am running the LoginFilter tasks.");
}
#Override
public void destroy() {
System.out.println("Goodbie from LoginFilter");
}
}
I have in my web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<display-name>Archetype Created Web Application</display-name>
<filter>
<filter-name>LoginFilter</filter-name>
<filter-class>afrominga.filters.LoginFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>LoginFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<error-page>
<error-code>404</error-code>
<location>/error/404.jsp</location>
</error-page>
<error-page>
<error-code>500</error-code>
<location>/error/500.jsp</location>
</error-page>
</web-app>
So, at the time of to open my browser with the root path context of my application, the filter print in the output the text of my System.out, but my page is left blank and does not show me the home page. I don't understand why this happens, this would must forward to my home page because only print a text in my console.
can would someone help me? please
One problem is that your doFilter() method. Right now, your filter is just printing and not passing the request along to the next filter/your application. You just need to add one line.
#Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
System.out.println("I am running the LoginFilter tasks.");
filterChain.doFilter(request, response)
}
I want to make a filter that would forward to /WEB-INF/index.html request to application that looks like this
http://localhost:8080/basic-application-web
Here is my filter
public class RootFilter implements Filter {
#Override
public void init(FilterConfig filterConfig) throws ServletException {}
#Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse resp = (HttpServletResponse) response;
if (req.getRequestURI().equals("/basic%2Dapplication%2Dweb/")) {
req.getRequestDispatcher("/WEB-INF/index.html").forward(req, resp);
}
chain.doFilter(request, response);
}
#Override
public void destroy() {}
}
My web.xml looks like this
<?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/javaeeweb-app_2_5.xsd'
id='basic_web' version='2.5'>
<display-name>Basic web application</display-name>
<servlet>
<servlet-name>serviceServlet</servlet-name>
<servlet-class>com.pack.ServiceServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>serviceServlet</servlet-name>
<url-pattern>/messaging</url-pattern>
</servlet-mapping>
<filter>
<filter-name>rootFilter</filter-name>
<filter-class>com.pack.RootFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>rootFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
However from time to time I get some weird behaviour where tomcat (I use it to deploy the war) is unable to find basic-application-web when I try to access directly using URL.
Though through tomcat manager it works fine. What is the problem? Maybe due to missing root servlet?
I moved index.html outside WEB-INF so basically the layout started to look like this
webapp
WEB-INF\web.xml
index.html
And adjusted filter to forward to /index.html instead of WEB-INF/index.html
req.getRequestDispatcher("/WEB-INF/index.html").forward(req, resp);
It has helped.
Even though I found several similar questions I'm not able to create my first Hello World Servlet. I keep receiving status code 404.
So in the following folder /home/smihai/apache-tomcat-7.0.52/webapps/HelloWorld/WEB-INF/ I have a web.xml file and another folder "classes" with 2 files: HelloWorld.java and HelloWorld.class.
The web.xml file contains:
<web-app>
<servlet>
<servlet-name>HelloWorld</servlet-name>
<servlet-class>HelloWorld</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloWorld</servlet-name>
<url-pattern>/HelloWorld</url-pattern>
</servlet-mapping>
</web-app>
The HelloWorld.java contains:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class HelloWorld extends HttpServlet{
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException,IOException{
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
pw.println("<html>");
pw.println("<head><title>Hello World</title></title>");
pw.println("<body>");
pw.println("<h1>Hello World</h1>");
pw.println("</body></html>");
}
}
What am I doing wrong?
You would need to put/move your HelloWorld.java class inside a package.
URL would be: localhost:8080/HelloWorld/HelloWorld
Folder Structure:
HelloWorld.java:
package servlets;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class HelloWorld
*/
public class HelloWorld extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* Default constructor.
*/
public HelloWorld() {
// TODO Auto-generated constructor stub
}
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter pw = response.getWriter();
pw.println("<html>");
pw.println("<head><title>Hello World</title></title>");
pw.println("<body>");
pw.println("<h1>Hello World</h1>");
pw.println("</body></html>");
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
Servlet-Mapping:
<servlet>
<description></description>
<display-name>HelloWorld</display-name>
<servlet-name>HelloWorld</servlet-name>
<servlet-class>servlets.HelloWorld</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HelloWorld</servlet-name>
<url-pattern>/HelloWorld</url-pattern>
</servlet-mapping>
URL:
This is my 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" id="WebApp_ID" version="2.5">
<filter>
<display-name>MyFilter</display-name>
<filter-name>MyFilter</filter-name>
<filter-class>AB_DB.MyFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>MyFilter</filter-name>
<url-pattern>/MyFilter</url-pattern>
</filter-mapping>
<servlet>
<description></description>
<display-name>Profile</display-name>
<servlet-name>Profile</servlet-name>
<servlet-class>AB_DB.Profile</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Profile</servlet-name>
<url-pattern>/Profile</url-pattern>
</servlet-mapping>
</web-app>
This is the filter servlet I've tried
package AB_DB;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
public class MyFilter implements Filter {
public MyFilter() {
}
public void destroy() {
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
String requri = ((HttpServletRequest) request).getRequestURI().substring(((HttpServletRequest) request).getContextPath().length() + 1);
System.out.println(requri);
//if request uri starts with user/ then system will forward the request to Profile servlet
if (requri.startsWith("user/")) {
//get userid from request uri
String id = requri.substring(5);
System.out.println(id);
//set attribute "user" with userid value
request.setAttribute("user", id);
//forward the request to Profile servlet
request.getRequestDispatcher("/Profile")
.forward(request, response);
} else {
chain.doFilter(request, response);
}
}
public void init(FilterConfig fConfig) throws ServletException {
}
}
However in the GlassFish 4 server log, there is no errors at all when running the project. The URI isnt even being printed out with 'System.out.println(id);' so I assume that the filter isnt even being injected.
Can anyone see any issues with my code? The sevlet Profile isn't being ran
You have mapped oyur filter to /MyFilter
<url-pattern>/MyFilter</url-pattern>
and that doesn't match with URL you are requesting
/user/Surname1993
so your filter won't get invoked
I basically have a filter and in it's doFilter method, i'm just printing a message to console and i have applied that filter to every page of my sample web app.
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_3_0.xsd" id="WebApp_ID" version="3.0">
<filter>
<filter-name>LoginFilter</filter-name>
<filter-class>
com.mypkg.filters.LoginFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>LoginFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>utility.jsp</welcome-file>
and my filter code
LoginFilter.java
package com.mypkg.filters;
import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.HttpServletResponse;
//other imports
public class LoginFilter implements Filter {
#Override
public void init(FilterConfig config) throws ServletException {
System.out.println("Filter init ran!");
}
#Override
public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {
System.out.println("Filter running!");
}
#Override
public void destroy(FilterConfig config) throws ServletException {
//System.out.println("Filter destoryed!");
}
Now when i first ran this filter, i got "Filter running" message but after that i included hibernate and other libraries, it stopped working, i removed them and same result. Filter doesn't run. Checked url pattern and everything.. Clueless!!
Any pointers?
First of all, in you doFilter method you should call the next filter in the chain:
chain.doFilter(request, response);
Without this your request will not be processed further after your filter.
This can be a reason of your problem.
EDIT:
Also your destroy() method is wrong. Here how you should rewrite it:
#Override
public void destroy() {
System.out.println("Filter destoryed!");
}
Maybe you have another Filter executed before yours, that does not call chain.doFilter(), thus preventing next filters (including yours) to be executed.