Tukukkk

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:

UsersrodrigoIdeaProjectsFrutemusrcmainjavaBeanfiltro.java:[5,20] error: package javax.servlet does not exist

[ERROR] UsersrodrigoIdeaProjectsFrutemusrcmainjavaBeanfiltro.java:[6,20] error: package javax.servlet does not exist

[ERROR] UsersrodrigoIdeaProjectsFrutemusrcmainjavaBeanfiltro.java:[7,20] error: package javax.servlet does not exist

[ERROR] UsersrodrigoIdeaProjectsFrutemusrcmainjavaBeanfiltro.java:[8,20] error: package javax.servlet does not exist

[ERROR] UsersrodrigoIdeaProjectsFrutemusrcmainjavaBeanfiltro.java:[9,20] error: package javax.servlet does not exist

[ERROR] UsersrodrigoIdeaProjectsFrutemusrcmainjavaBeanfiltro.java:[10,20] error: package javax.servlet does not exist

[ERROR] UsersrodrigoIdeaProjectsFrutemusrcmainjavaBeanfiltro.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>

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>

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>

The answer provided by @Matthias Herlitzius is mostly correct. Just for further clarity.

The servlet-api jar is best left up to the server to manage see here for detail

With that said, the dependency to add may vary according to your server/container. For example in Wildfly the dependency would be

<dependency>

    <groupId>org.jboss.spec.javax.servlet</groupId>

    <artifactId>jboss-servlet-api_3.1_spec</artifactId>

    <scope>provided</scope>

</dependency>

So becareful to check how your container has provided the servlet implementation.

I needed to import javaee-api as well.

  <dependency>

     <groupId>javax</groupId>

     <artifactId>javaee-api</artifactId>

     <version>7.0</version>

  </dependency>

Unless I got following error:

package javax.servlet.http does not exist

javax.servlet.annotation does not exist

javax.servlet.http does not exist

...

In my case, migrating a Spring 3.1 app up to 3.2.7, my solution was similar to Matthias's but a bit different -- thus why I'm documenting it here:

In my POM I found this dependency and changed it from 6.0 to 7.0:

    <dependency>

        <groupId>javax</groupId>

        <artifactId>javaee-web-api</artifactId>

        <version>7.0</version>

        <scope>provided</scope>

    </dependency>

Then later in the POM I upgraded this plugin from 6.0 to 7.0:

        <plugin>

            <groupId>org.apache.maven.plugins</groupId>

            <artifactId>maven-dependency-plugin</artifactId>

            <version>2.1</version>

            <executions>

                <execution>

                    ...

                    <configuration>

                        ...

                        <artifactItems>

                            <artifactItem>

                                <groupId>javax</groupId>

                                <artifactId>javaee-endorsed-api</artifactId>

                                <version>7.0</version>

                                <type>jar</type>

                            </artifactItem>

                        </artifactItems>

                    </configuration>

                </execution>

            </executions>

        </plugin>