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ClassNotFoundException on ServletContainer when configuring Jersey in Intellij

When trying to configure jax rs in intellij I get this error:
java.lang.ClassNotFoundException: org.glassfish.jersey.servlet.ServletContainer
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1945)
My webconfig looks like this:
<?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">
<servlet>
<servlet-name>Rest</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>jersey.config.server.provider.packages</param-name>
<param-value>com.umbrella.server.api</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Rest</servlet-name>
<url-pattern>/api/*</url-pattern>
</servlet-mapping>
</web-app>
I manually downloaded the entire jersey pack from the official jersey website. Which should contain all the dependencies.
The weird thing is that whenever I create a class that derives from the ServletContainer it doesn't give any errors.

I found the anwser with the help of Eugen Covaci.
In the Intellij project settings there is a tab called problems. When clicking solve on the problems listed there it started working again.
Another issue was that the jar files were located in web/WEB_INF/libs/api instead of the correct folder (web/WEB_INF/lib)

Error 404 when accessing a resource in a Java Dynamic Web Project

can someone tell me how to setup my project structure and my web.xml?
In my dynamic web project in the java resources folder i have a servlet (class name: RestFulService) which delivers a JSON file.
The web pages are in the WebContent-folder, for example index.jsp.
The project is published with a glassfish server.
This is my current 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"
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">
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>RestFulService</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>jersey.config.server.provider.packages</param-name>
<param-value>com.javasrc, com.jersey.jaxb, com.fasterxml.jackson.jaxrs.json</param-value>
</init-param>
<init-param>
<param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>RestFulService</servlet-name>
<url-pattern>/*</url-pattern>
</servlet-mapping>
</web-app>
The link to access the JSON works well (http://localhost:8080/BCode/liveHelp/getText) but if i want to access the index.jsp via "http://localhost:8080/BCode/index.jsp" all i get is an error 404 page.
Can anyone please tell me where the problem is an what i have to change to get it working?
I guess the problem is in the web.xml but I don't have any idea what to change.

I want to call a Servlet as a very first file

I want to call a Servlet as a very first file to execute like welcome file.
In this servlet I am retrieving data from database and rendering it to display page at a very first page.
what I need is when I run program
either
url should be-http://localhost:8083/projectName/servletUrl
not http://localhost:8083/projectName/
or
if url is http://localhost:8083/projectName this should hit my servlet(/servletUrl) not welcome file.

Edit this file WebContent->WEB-INF->lib->web.xml.
It will only be visible if you have ticked the Generate web.xml deployment descriptor while creating the project.
<?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>Database_Conn</display-name>
<welcome-file-list>
<welcome-file>ServletURLpattern</welcome-file>
</welcome-file-list>
</web-app>

Configure your servlet URLpattern as <welcome-file> in web.xml file located in WEB-INF folder of webapp like below:
<?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>ProjectName</display-name>
<welcome-file-list>
<welcome-file>ServletURLpattern</welcome-file>
</welcome-file-list>
</web-app>
Assuming you use eclipse as IDE and servlet version 3 or 3.1 than you have to create web.xml manually.

I have used such servlet mapping:
<servlet-mapping>
<servlet-name>Controller</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
The key part is URL pattern that matches all possible URLs unless you add another servlet-mapping for other servlets.

<servlet>
<servlet-name>PenServlet</servlet-name>
<servlet-class>com.sun.PenServlet</servlet-class>
<load-on-startup>0</load-on-startup>
</servlet>
Here load-on-startup is an attribute of web.xml that will loaded first
if it has a lowest Integer Number.for example if you have 3 servlet that
is mentioned in the web.xml like
<servlet>
<servlet-name>PenServlet1</servlet-name>
<servlet-class>com.sun.PenServlet1</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet>
<servlet-name>PenServlet0</servlet-name>
<servlet-class>com.sun.PenServlet0</servlet-class>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet>
<servlet-name>PenServlet2</servlet-name>
<servlet-class>com.sun.PenServlet2</servlet-class>
<load-on-startup>2</load-on-startup>
</servlet>
Here then load-on-startup 0 is loaded first in your web application
then 1 and 2 and so on..
you need to use this to get data and set it to your first page or return
your page from servlet with loaded data.

404 Not Found error was encountered while trying to use an ErrorDocument to handle the request

I am developing a website and i am finding hosting issues. I have put all my .jsp files in the root directory.
I am able to see the JSPs (accessing directly to them).
But, when i try to perform the same check the WEB-INF/classes, I get the error:
Not Found The requested URL /AC/SearchController was not found on this server. Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
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://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>AC</display-name>
<welcome-file-list>
<welcome-file>Home.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>AdvisorProfileServlet</servlet-name>
<servlet-class>org.AC.controller.AdvisorProfileServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>AdvisorProfileServlet</servlet-name>
<url-pattern>/AC/AdvisorProfilePage?aId=*</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>ForgotPasswordRedirectController</servlet-name>
<servlet-class>org.AC.controller.ForgotPasswordURLController</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ForgotPasswordRedirectController</servlet-name>
<url-pattern>/ForgotPasswordAdvisor</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>AdvisorMyAccountRequest</servlet-name>
<servlet-class>org.AC.controller.AdvisorMyAccountRequestController</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>AdvisorMyAccountRequest</servlet-name>
<url-pattern>/AC/requests.jsp</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>ForgotPasswordRedirectControllerUser</servlet-name>
<servlet-class>org.AC.controller.UserForgotPasswordURLController</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ForgotPasswordRedirectControllerUser</servlet-name>
<url-pattern>/ForgotPasswordUser</url-pattern>
</servlet-mapping>
</web-app>
This might also be a server config, because I created the project on Tomcat server 8, but I guess the server which is now hosting it is Tomcat 7.
How can I resolve this?

Please declare "/AC/SearchController" as url pattern in your web.xml

Simple Rest service with Tomcat and Eclipse, Mac os. The requested resource is not available

I tried a lot of differents configurations following some other posts, but anything worked. I'm trying to run this simple tutorial(http://www.vogella.com/tutorials/REST/article.html) but i'm still having the message: "The requested resource is not available". Anyone?
Running on Eclipse Kepler, Tomcat 7 and MAC OS 10.8.5.
I tried this configuration for the web.xml, but didn't work too (reference: Running Jersey project (Rest web service) to tomcat)
<?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" 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">
<display-name>Hello</display-name>
<servlet>
<servlet-name>ServletAdaptor</servlet-name>
<servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>ServletAdaptor</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>
and those are the jars in the last try:
asm-3.3.1.jar
jersey-bundle-1.12.jar
jersey-server-1.12.jar
jersey-servlet-1.12.jar
jsr311-api-1.0.jar
tried the following urls:
http://localhost:8080/Hello/
http://localhost:8080/de.vogella.jersey.first/rest/hello

You mapped the rest request to the path <url-pattern>/rest/*</url-pattern> so your request should be something like http://localhost:8080/rest/Hello/