errore: pacchetto javax.servlet non esiste

Question

stavo cercando di implementare un filtro di accesso nella mia web app con JSF 2, seguendo questa guida:

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

dopo che ho compilato la mia filtro e aggiunto il. classe in "web-inf/classes" (come dice la guida) il filtro ha funzionato, ma ho messo l'url sbagliato per reindirizzare alla pagina di login in modo da eliminare il filter.class dalla cartella (web-inf/classes) e provato per compilare di nuovo il progetto, ma non è riuscito, e da allora im ottenere ottenere "pacchetto javax.servlet non esiste"

è strano perché prima stava funzionando un d ho javax.servlet nel mio pom.xml .. ho provato a pulire il progetto, ma niente.

questa è la mia classe di filtro:

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. 
    } 
} 

questo è l'errore:

\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 

mia 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

La dipendenza javax.servlet manca nella vostra pom.xml. Aggiungere quanto segue alla dipendenze-Node:

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

Answer 2

Ho solo messo questo codice nel mio pom.xml e ho eseguito il comando Maven installazione.

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

Answer 3

Nel mio caso, la migrazione di un app Primavera 3.1 fino a 3.2.7, la mia soluzione era simile a Matthias di, ma un po 'diverso - così perché mi sto documentando qui:

In il mio POM ho trovato questa dipendenza e lo cambiò 6,0-7,0:

<dependency> 
     <groupId>javax</groupId> 
     <artifactId>javaee-web-api</artifactId> 
     <version>7.0</version> 
     <scope>provided</scope> 
    </dependency> 

Poi più tardi nel POM ho aggiornato questo plugin 6,0-7,0:

 <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> 

Answer 4

La risposta fornita da @Matthias Herlitzius è per la maggior parte corretta. Solo per ulteriore chiarezza.

Il vaso servlet-api è meglio lasciare al server di gestire see here for detail

Detto questo, la dipendenza da aggiungere può variare in base al server/contenitore. Ad esempio in Wildfly la dipendenza sarebbe

<dependency> 
    <groupId>org.jboss.spec.javax.servlet</groupId> 
    <artifactId>jboss-servlet-api_3.1_spec</artifactId> 
    <scope>provided</scope> 
</dependency> 

Quindi, è necessario verificare come il contenitore ha fornito l'implementazione della servlet.

Answer 5

forse non esiste javaee-api-7.0.jar. scaricare questo barattolo e sul progetto destra clik

1. sul progetto tasto destro del mouse
2. percorso di generazione
3. Configura percorso di generazione
4. Aggiungi Vasi esterni
5. JavaEE-api-7.0.jar scegliere
6. Applicare e finire

Answer 6

Ho anche avuto bisogno di importare javaee-api.

<dependency> 
    <groupId>javax</groupId> 
    <artifactId>javaee-api</artifactId> 
    <version>7.0</version> 
    </dependency> 

A meno che non mi sono l'errore seguente:

package javax.servlet.http does not exist 
javax.servlet.annotation does not exist 
javax.servlet.http does not exist 
...