IntelliJ IDEA cannot resolve import javax.servlet.*;

Question

So I had my project working perfectly and I decided to install a new hard drive (SSD) and now I cannot get it to run correctly.

I am using Intellij and am having all of these imports have issues.

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; import javax.servlet.http.HttpServletResponse; 

They are saying cannot resolve symbol.

Also in my web.xml I have this.

<filter>     <filter-name>LoginFilter</filter-name>     <filter-class>com.mkyong.LoginFilter</filter-class> </filter> 

it states

com.mkyong.LoginFilter is not assignable to javax.servlet.Filter 

Im going to include my web.xml just in case someone needs it.

<?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>JavaServerFaces</display-name>  <resource-ref> <description>MySQL Datasource example</description> <res-ref-name>jdbc/mkyongdb</res-ref-name> <res-type>javax.sql.DataSource</res-type> <res-auth>Container</res-auth> </resource-ref>   <!-- Change to "Production" when you are ready to deploy --> <context-param> <param-name>javax.faces.PROJECT_STAGE</param-name> <param-value>Development</param-value> </context-param>  <!-- Welcome page --> <welcome-file-list> <welcome-file>faces/default.xhtml</welcome-file> </welcome-file-list>  <!-- JSF mapping --> <servlet> <servlet-name>Faces Servlet</servlet-name> <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet>    <!-- Map these files with JSF -->  <servlet-mapping>   <servlet-name>Faces Servlet</servlet-name>   <url-pattern>/faces/*</url-pattern>  </servlet-mapping>   <servlet-mapping>    <servlet-name>Faces Servlet</servlet-name>    <url-pattern>*.jsf</url-pattern>  </servlet-mapping>  <servlet-mapping>   <servlet-name>Faces Servlet</servlet-name>   <url-pattern>*.faces</url-pattern> </servlet-mapping>  <servlet-mapping> <servlet-name>Faces Servlet</servlet-name> <url-pattern>*.xhtml</url-pattern> </servlet-mapping>  <filter>     <filter-name>LoginFilter</filter-name>     <filter-class>com.mkyong.LoginFilter</filter-class> </filter> <!-- Set the login filter to secure all the pages in the /secured/* path of the application  --> <filter-mapping>     <filter-name>LoginFilter</filter-name>     <url-pattern>/secured/*</url-pattern> </filter-mapping>  <!-- By default go to secured welcome page --> <welcome-file-list>     <welcome-file>secured/welcome.xhtml</welcome-file> </welcome-file-list>  </web-app> 

This is the error I am getting now.

   javax.servlet.ServletException: Servlet.init() for servlet Faces Servlet threw exception org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:534) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1081) org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658) org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:277)     org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2381)     org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2370)     java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)     java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)     org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)     java.lang.Thread.run(Thread.java:745) root cause  java.lang.IllegalStateException: Application was not properly initialized at startup, could not    find Factory: javax.faces.context.FacesContextFactory javax.faces.FactoryFinder$FactoryManager.getFactory(FactoryFinder.java:800) javax.faces.FactoryFinder.getFactory(FactoryFinder.java:302) javax.faces.webapp.FacesServlet.init(FacesServlet.java:186) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:534) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1081) org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658) org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:277) org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2381) org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2370) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) java.lang.Thread.run(Thread.java:745) 

I was also using apache tomcat 8 at first then I thought that might be the issue and I changed it to 7 then to 6. If you need anything else please let me know!

here is the POM.xml as requested.

  <project xmlns="http://maven.apache.org/POM/4.0.0"   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0   http://maven.apache.org/maven-v4_0_0.xsd">   <modelVersion>4.0.0</modelVersion>  <groupId>com.mkyong.common</groupId>  <artifactId>JavaServerFaces</artifactId>  <packaging>war</packaging>  <version>1.0-SNAPSHOT</version>  <name>JavaServerFaces Maven Webapp</name>  <url>http://maven.apache.org</url>  <repositories>  <repository>    <id>java.net.m2</id>    <name>java.net m2 repo</name>    <url>http://download.java.net/maven/2</url>  </repository> </repositories>  <dependencies>    <dependency>       <groupId>org.springframework.security</groupId>       <artifactId>spring-security-web</artifactId>       <version>3.2.5.RELEASE</version>   </dependency>  <!-- MySQL database driver --> <dependency>     <groupId>mysql</groupId>     <artifactId>mysql-connector-java</artifactId>     <version>5.1.9</version> </dependency>  <!-- Spring framework -->  <dependency>     <groupId>org.springframework</groupId>     <artifactId>spring</artifactId>     <version>2.5.6</version> </dependency>  <dependency>     <groupId>org.springframework</groupId>     <artifactId>spring-web</artifactId>     <version>2.5.6</version> </dependency>   <!-- For Servlet Container like Tomcat --> <!-- http://download.java.net/maven/2 --> <dependency>   <groupId>com.sun.faces</groupId>   <artifactId>jsf-api</artifactId>   <version>2.1.0-b03</version> </dependency>    <!-- EL 2.2 to support method parameter in EL --> <dependency>   <groupId>org.glassfish.web</groupId>   <artifactId>el-impl</artifactId>   <version>2.2</version> </dependency>   <!-- http://repo1.maven.org/maven2/ --> <dependency>   <groupId>javax.servlet</groupId>   <artifactId>jstl</artifactId>   <version>1.2</version> </dependency>    <dependency>       <groupId>javax.servlet.jsp</groupId>       <artifactId>jsp-api</artifactId>       <version>2.1</version>   </dependency>    <dependency>       <groupId>javax.servlet</groupId>       <artifactId>servlet-api</artifactId>       <version>2.5</version>   </dependency>   </dependencies>    <build>    <finalName>JavaServerFaces</finalName>    <plugins>      <plugin>        <groupId>org.apache.maven.plugins</groupId>        <artifactId>maven-compiler-plugin</artifactId>        <version>2.3.1</version>        <configuration>            <source>1.6</source>            <target>1.6</target>        </configuration>    </plugin> </plugins> 

Answer 1

As somebody mentioned it above - these libraries are part of an application server so they should not be deployed to the server as other libraries like Spring and so on. You need reference them as a provided resource.

If you are not using Maven for your project (i.e. tutorials etc.) you can go to your Project Structure settings / Modules / your module / Dependencies .. and down under the list of dependendcies is a small plus symbol (+) where you can select "Library" and after that the popup with Application Server Libraries will show. It should be selected as provided afterwards.