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How to access a jsp page inside a folder under WEB-INF?

I'm learning about servlets and JSP and I try to make an app. The app is from this page
This is the structure of the app:
And I put all the JSP in WEB-INF:
When I try to run any jsp it's not working, I get this error: HTTP Status 404 – Not Found... Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.
If I move the jsp in WebContent the app is working succesfully. But I want to keep the jsp in WEB-INF. What should I do? Thanks in advance!

Seems i got your problem. If you have servlet class write code to forward to jsp page like this. Because you have put your jsp page inside WEB-INF/view
request.getRequestDispatcher("/WEB-INF/view/homeView.jsp").forward(request, response);

JSP file not using CSS because of web.xml

I've had this simple jsp log-in form that used the css style sheet. It was working just fine until I included the web.xml file in my directory. Now the JSP file won't load the css files no matter what. I've tried changing the link address of the css in multiple different ways but with no luck.
I'm pretty positive that the web.xml file is the reason it's not loading because if I remove it, everything works again.
Here's my project structure:
Here's my login.jsp:
here's my web.xml:

Your web.xml includes /* in a security constraint, limiting access to all content of your application to those users with the role users. This means that, instead of serving your CSS file as requested to the browser, tomcat will redirect to the login.jsp as well (which is obviously an incorrect and not very stylish stylesheet)

Common Error Page for All Directories in Java Web App

I am trying to have a error.html error page in my Java WebApp with web.xml entry as below:
<error-page>
<location>/error.html</location>
</error-page>
having a directory listing as:
--App
-- index.html
-- error.html
-- css/
-- ...
-- js/
-- ...
-- img/
-- ...
-- folder/
-- index.html
When I enter an address say:
/App/some-wrong-address or /App/folder/some-wrong-address
In both the cases I am able to see the Error Page called in as part of 404 error, but in latter case I am not getting my resources like caa, js, or img pulled up.
I understand that the resources are called relatively with ./... path and in the second case it is expecting it to be ../... because of directory change, but I want to OVERCOME this thing, I am not directly working on production server and I cannot use exact URL of everything with localhost as it will have to change later everywhere.
Let me know how can I do this?
I am using Tomcat 8.0.28 and WebApp version is 3.1.

The key is to correctly produce all of the HTML that your webapp produces. The HTML must have the correct URLs (note: they are URLs, not paths) in the elements that refer to other assets (CSS, images, javascript).
You are correct that putting the absolute URL of your production system in your source files is not a workable solution.
In a JavaEE web app I worked on, we used JSF Facelets as the templating system for producing our HTML. In that we wrote each URL like this:
<script src="#{request.contextPath}/foo/bar/baz.js" />
<img src="#{request.contextPath}/img/something.png" />
This allows any template, at any location in the URL hierarchy, to reference any asset. The JavaEE app server handles filling in the correct context path so that the resulting URL the browser handles is correct regardless of where it is hosted.

application.getContextPath() will give you page context,and you can base ur urls accordingly after that..will work on local server as well as deplyment server..
e.g: ... href=" <%=application.getContextPath()%>/css/yourcss.css" ... etc.
N.B.: its a good idea to design your error page in a way that it as no dependencies to any other files..styling and resources in that case should be absolute or inline and images if any should reside in the same folder as your error page

Why the contents of welcome page in jsp isn't loading?

i have made one project on E-Commerce using JSP technology of JEE, in that i have assigned a page named as home.jsp as a welcome page of my project. The page is located in the home_page folder of the Web Contents folder of my project. But when i run the project the contents of home.jsp don't get loaded in the browser page. I am attaching the code of the welcome page and the screenshot of the default welcome page in the browser apart from that i am also attaching the screenshot of the welcome page which is expected to come when the project executes.
<welcome-file-list>
<welcome-file>/home_page/home.jsp</welcome-file>
</welcome-file-list>

Try adding "/" at the end of the URL you're trying to access. It should fix it if you have servlets mapped in your web.xml.

Servlet link relative to application base

I am writing a servlet (specifically with Scalatra). In the servlet I have many links on a table of contents which is included with every page. I want these links to be relative to the application base. If I use links such as "/foo", everything works fine when the servlet is served from the root (localhost:8080/) but if I serve it from Jetty/Tomcat along with other servlets (localhost:8080/servlet) the link points outside of the servlet.
What is a good fix for this problem?

You need to prepend the link URL with a domain-relative path including the context path as obtained by HttpServletRequest#getContextPath(). I don't do Scala, so I can't give a Scala-targeted answer, but here's how you'd do it in JSP so that the picture is sound:
link
When the current context path is /foo, then the above will end up in HTML as
link
Or if you're generating HTML programmatically using Java inside a servlet class (which is actually a poor practice, but that aside):
out.println("link");
An alternative is to set the <base> tag in HTML so that all relative links are relative to it, see also this answer for more detail: Browser can't access/find relative resources like CSS, images and links when calling a Servlet which forwards to a JSP