Failed to load resource files when mapping Servlet on URL pattern of / - servlets

I use NetBeans and Tomcat 7.0.4.2 and would like to change URL address of my project from localhost:8080/Servlet to localhost:8080/. In web.xml I changed servlet URL address from <url-pattern>/Servlet</url-pattern> to <url-pattern>/</url-pattern>.
The problem is I can't load resource files now and get errors in browser console log:
Failed to load resource: the server responded with a status of 404 (Not Found) (11:45:14:149 | error, network)
at src/main/webapp/scripts/aui-min_2.0.0.js
The path to resource files is src/main/webapp/scripts and in JSP file I use this path
<script type="text/javascript" src="scripts/aui-min_2.0.0.js"></script>
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<servlet>
<servlet-name>Servlet</servlet-name>
<servlet-class>socialgraphui.Servlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Servlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
</web-app>

The url pattern / is is used by default servlet which is capable of loading static resources that isn't mapped by other servlets. When you switched to this pattern it's stopped working. So, you should keep a servlet mapping.
<servlet-mapping>
<servlet-name>Servlet</servlet-name>
<url-pattern>/Servlet</url-pattern>
</servlet-mapping>
If you want to start from the index page use a index.jsp that is listed in <welcome-file-list> configuration. The index page can redirect to the servlet using
response.sendRedirect(request.getContextPath() +"/Servlet");
To load static resource use servlet context path like that
<script type="text/javascript" src="${pageContext.request.contextPath}/scripts/aui-min_2.0.0.js"></script>

Related

JSP can not read CSS because of web.xml

This is not a theory. I have proof. I've been on this problem for almost a day. My jsp seem to can't read/find CSS. I've done a lot of solutions but nothing work. Until I decide maybe one of my files is causing it. Then I do trial and error. Deleting file to see which one causes it.
Until i'm in web.xml. I deleted web.xml, run the JSP and boom it read the CSS. I copy back the web.xml and then again my css can't be read.
By the way i'm using spring mvc, and my project is maven web application.
below are my codes:
jsp(css link part):
<link rel="stylesheet" type="text/css" href="../../css/logincss.css">
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_3_1.xsd"
version="3.1">
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<servlet>
<servlet-name>DpServlet</servlet-name>
<servlet-class>
org.springframework.web.servlet.DispatcherServlet
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>DpServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
I think the error is that when i'm requesting a css file, the request goes to dispatcherservlet so that is so error. How can I fix my problem? Please I need solution i've been on this problem for over a DAY! Thanks in advance.

Web.xml servlet-class references to non-existent class "ClassName"

I am working on a project and hit a brick wall. I couldn't find any resources or bug reports to solve this issue. I have a maven project setup as maven-archetype-webapp. I am new to JEE and it took me sometime to get this far but I have a better understanding of how some of this works. I have hit a brick wall and don't know how to solve the problem below.
I get the following warnings within the web.xml file
servlet-class references to non-existent class "servlets.RegisterServlet"
servlet-class references to non-existent class "servlets.HomePageServlet"
file name references to "index" that does not exist in web content
I get the following error in WildFly 10.x.
Caused by: java.lang.ClassNotFoundException: servlets.RegisterServlet from [Module "deployment.PracticeProject.war:main" from Service Module Loader]
at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:198)
at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:363)
at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:351)
at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:93)
at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService.createServletConfig(UndertowDeploymentInfoService.java:723)
... 6 more
The java classes appear in the directory structure of the war so its packaging it correctly. For the entities, session beans and servlets I have a scope of provided for the dependencies of the pom.xml file.
My directory structure is as follows:
My web.xml file:
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
id="WebApp_ID" version="3.1">
<display-name>PracticeProject</display-name>
<servlet>
<servlet-name>RegisterServlet</servlet-name>
<servlet-class>servlets.RegisterServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>RegisterServlet</servlet-name>
<url-pattern>/register</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>HomePageServlet</servlet-name>
<servlet-class>servlets.HomePageServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>HomePageServlet</servlet-name>
<url-pattern></url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index</welcome-file>
</welcome-file-list>
</web-app>
edit:
CHKJ3013E: The URL Mapping "" is invalid. web.xml /PracticeProject/src/main/webapp/WEB-INF org.eclipse.jst.j2ee.webapplication.internal.impl.ServletMappingImpl#53667dce (urlPattern: , name: null) Validation Message

Run servlet as homepage [duplicate]

This question already has answers here:
Change default homepage in root path to servlet with doGet
(2 answers)
Closed 7 years ago.
I have a dynamic web project with a servlet (structure below).
When right-clicking HomeServlet.java --> Run as --> Run on Server --> Tomcat...
It runs fine with the URL: http://localhost:8080/JSTLTest/HomeServlet
When right-clicking JSTLTest --> Run as --> Run on Server --> Tomcat...
I get an error and this URL is used: http://localhost:8080/JSTLTest/
The problem is, i want to deploy it on a server like AWS elastic beanstalk and i guess it doesn't work because he won't use the servlet to start, like:
http://default-environment-9a5exxxd3z.elasticbeanstalk.com/HomeServlet
Is my web.xml wrong?
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<display-name>JSTLTest</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>Home</servlet-name>
<servlet-class>com.journaldev.servlet.HomeServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Home</servlet-name>
<url-pattern>/HomeServlet</url-pattern>
</servlet-mapping>
</web-app>
Structure:
Replace
<url-pattern>/HomeServlet</url-pattern>
with
<url-pattern></url-pattern>
The url pattern is the url that added to the the protocol + server + port + context (something like http://localhost:8080/myapp) can be used to access to a particular servlet.
Note the pattern must be empty. The pattern / is the default pattern. So it match all possible patterns (also what you don't like).

Servlet Programming Using Eclipse IDE

I have started learning servlet programming. I am using eclipse IDE. I have created a simple dynamic web project and have one html file and one servlet program in it(LoginForm.html & LoginServlet.java). I want to display the html page to the user at first .I have also set up the welcome-file-list tag in the web.xml but when I run the project it doesn't display that page. I also tried to enter the url in the browser manually but it's also not working.It is giving the error as '404-Page not found'. My web.xml file is
<?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">
<display-name>LoginApp</display-name>
<welcome-file-list>
<welcome-file>LoginForm.html</welcome-file>
</welcome-file-list>
<servlet>
<description></description>
<display-name>LoginServlet</display-name>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>com.myprograms.servlet.LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/logapp</url-pattern>
</servlet-mapping>
</web-app>
The URL I am using is http://localhost:8001/LoginApp/LoginForm.html. Please suggest any solution.

JSP Site web.xml issue Page not found for url-pattern /MyController in sevlet-mapping

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>MyController</servlet-name>
<servlet-class>com.pk.MyController</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>MyController</servlet-name>
<url-pattern>/MyController</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
I have this configuration, but unable to access hzhfyp.com/MyController (PAGE NOT FOUND)
The Path for MyController servelet is WEB-INF/classes/com/pk/MyController.class
Although index.jsp is loaded accuratelty. Demo here http://hzhfyp.com/ Clicking any button will generate js error visible in Firebug(firefox) as Page not Found.
URLs are case sensitive. You've mapped it on /MyController with M, but your jQuery code is calling it by /myController with m. Fix it accordingly.
As to the servlet returing a 404 in spite of the correct URL, this can happen when the servlet failed to initialize or when you didn't deploy the correct web.xml at all. Read the server startup logs for any errors during servlet initialization and verify if you're deploying with the right web.xml.

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