error: package javax.servlet does not exist

Question

I was trying to implement a login filter in my web app with jsf 2, following this guide:

https://stackoverflow.com/tags/servlet-filters/info

after I compiled my filter and added the .class in "web-inf/classes" (as the guide says) the filter worked, but i put the wrong url to redirect to the login page so i deleted the filter.class from the folder (web-inf/classes) and tried to compile the project again , but it failed, and since then im getting "package javax.servlet does not exist"

it is weird because before it was working and i have javax.servlet in my pom.xml.. i tried cleaning the project, but nothing.

this is my filter class:

package Bean;  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.annotation.WebFilter; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession;  /**  * Created with IntelliJ IDEA.  * User: rodrigo  * Date: 28-04-13  * Time: 06:54 AM  * To change this template use File | Settings | File Templates.  */ @WebFilter("/Contenido/*") public class filtro implements Filter {      @Override     public void init(FilterConfig config) throws ServletException {         // If you have any <init-param> in web.xml, then you could get them         // here by config.getInitParameter("name") and assign it as field.     }      @Override     public void doFilter(ServletRequest request, ServletResponse response,             FilterChain chain) throws ServletException, IOException {         HttpServletRequest req = (HttpServletRequest) request;         LoginBean user = (LoginBean) req.getSession().getAttribute("user");          if (user != null && user.isLoggedIn()) {             // User is logged in, so just continue request.             chain.doFilter(request, response);         } else {             // User is not logged in, so redirect to index.             HttpServletResponse res = (HttpServletResponse) response;             res.sendRedirect(req.getContextPath() + "/Contenido/Login.xhtml");         }     }      @Override     public void destroy() {         // If you have assigned any expensive resources as field of         // this Filter class, then you could clean/close them here.     } } 

this is the error:

\Users\rodrigo\IdeaProjects\Frutemu\src\main\java\Bean\filtro.java:[5,20] error: package javax.servlet does not exist [ERROR] \Users\rodrigo\IdeaProjects\Frutemu\src\main\java\Bean\filtro.java:[6,20] error: package javax.servlet does not exist [ERROR] \Users\rodrigo\IdeaProjects\Frutemu\src\main\java\Bean\filtro.java:[7,20] error: package javax.servlet does not exist [ERROR] \Users\rodrigo\IdeaProjects\Frutemu\src\main\java\Bean\filtro.java:[8,20] error: package javax.servlet does not exist [ERROR] \Users\rodrigo\IdeaProjects\Frutemu\src\main\java\Bean\filtro.java:[9,20] error: package javax.servlet does not exist [ERROR] \Users\rodrigo\IdeaProjects\Frutemu\src\main\java\Bean\filtro.java:[10,20] error: package javax.servlet does not exist [ERROR] \Users\rodrigo\IdeaProjects\Frutemu\src\main\java\Bean\filtro.java:[11,31] error: package javax.servlet.annotation does not exist 

my pom.xml:

<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>Frutemu</groupId>     <artifactId>Frutemu</artifactId>     <packaging>war</packaging>     <version>1.0-SNAPSHOT</version>     <name>Frutemu Maven Webapp</name>     <url>http://maven.apache.org</url>     <repositories>         <repository>             <id>prime-repo</id>             <name>Prime Repo</name>             <url>http://repository.primefaces.org</url>         </repository>     </repositories>     <dependencies>         <dependency>             <groupId>junit</groupId>             <artifactId>junit</artifactId>             <version>3.8.1</version>             <scope>test</scope>         </dependency>         <dependency>             <groupId>javax.ejb</groupId>             <artifactId>ejb-api</artifactId>             <version>3.0</version>             <scope>provided</scope>         </dependency>         <dependency>             <groupId>org.primefaces</groupId>             <artifactId>primefaces</artifactId>             <version>3.5</version>         </dependency>         <dependency>             <groupId>org.primefaces.themes</groupId>             <artifactId>all-themes</artifactId>             <version>1.0.9</version>         </dependency>         <dependency>             <groupId>javax.faces</groupId>             <artifactId>jsf-api</artifactId>             <version>2.0</version>             <scope>compile</scope>         </dependency>         <dependency>             <groupId>com.sun.faces</groupId>             <artifactId>jsf-impl</artifactId>             <version>2.0.2-b10</version>             <scope>compile</scope>         </dependency>         <dependency>             <groupId>javax.servlet</groupId>             <artifactId>jstl</artifactId>             <version>1.2</version>         </dependency>         <!-- MySQL database driver -->         <dependency>             <groupId>mysql</groupId>             <artifactId>mysql-connector-java</artifactId>             <version>5.1.21</version>         </dependency>         <dependency>             <groupId>org.glassfish.web</groupId>             <artifactId>el-impl</artifactId>             <version>2.2.1-b04</version>             <scope>provided</scope>         </dependency>         <!-- OpenJPA framework -->         <dependency>             <groupId>org.apache.openjpa</groupId>             <artifactId>openjpa-all</artifactId>             <version>2.2.0</version>         </dependency>         <dependency>             <groupId>com.microsoft.sqlserver</groupId>             <artifactId>sqljdbc4</artifactId>             <version>4.0</version>         </dependency>         <dependency>             <groupId>net.sf.jasperreports</groupId>             <artifactId>jasperreports</artifactId>             <version>4.1.2</version>         </dependency>     </dependencies>     <build>         <finalName>Frutemu</finalName>         <plugins>             <!-- Open Jpa -->             <plugin>                 <groupId>org.apache.openjpa</groupId>                 <artifactId>openjpa-maven-plugin</artifactId>                 <version>2.2.0</version>                 <configuration>                     <includes>**/model/*.class</includes>                     <addDefaultConstructor>true</addDefaultConstructor>                     <enforcePropertyRestrictions>true</enforcePropertyRestrictions>                 </configuration>                 <executions>                     <execution>                         <id>enhancer</id>                         <phase>process-classes</phase>                         <goals>                             <goal>enhance</goal>                         </goals>                     </execution>                 </executions>             </plugin>             <!-- Plugin para levantar una instancia de Tomcat 7 liviana, única para este proyecto -->             <plugin>                 <groupId>org.apache.tomcat.maven</groupId>                 <artifactId>tomcat7-maven-plugin</artifactId>                 <version>2.0</version>                 <configuration>                     <url>http://127.0.0.1:8080/manager/text</url>                     <server>TomcatServer</server>                     <path>/Frutemu</path>                 </configuration>             </plugin>             <plugin>                 <groupId>org.codehaus.mojo</groupId>                 <artifactId>jasperreports-maven-plugin</artifactId>                 <executions>                     <execution>                         <goals>                             <goal>compile-reports</goal>                         </goals>                     </execution>                 </executions>                 <dependencies>                     <!--note this must be repeated here to pick up correct xml validation -->                     <dependency>                         <groupId>net.sf.jasperreports</groupId>                         <artifactId>jasperreports</artifactId>                         <version>4.1.2</version>                     </dependency>                 </dependencies>             </plugin>         </plugins>     </build> </project> 

Answer 1

The javax.servlet dependency is missing in your pom.xml. Add the following to the dependencies-Node:

<dependency>     <groupId>javax.servlet</groupId>     <artifactId>javax.servlet-api</artifactId>     <version>3.0.1</version>     <scope>provided</scope> </dependency> 

Answer 2

I only put this code in my pom.xml and I executed the command maven install.

<dependency>     <groupId>javax.servlet</groupId>     <artifactId>javax.servlet-api</artifactId>     <version>3.0.1</version>     <scope>provided</scope> </dependency>