Java依赖关系问题（Intellij/Maven）

我无法在Intellij的Java项目中导入一组库。我正在使用maven来解决依赖关系;是在POM文件的依赖关系如下：Java依赖关系问题（Intellij/Maven）

的pom.xml

... 
<dependencies> 
     <dependency> 
      <groupId>com.google.guava</groupId> 
      <artifactId>guava</artifactId> 
      <version>17.0</version> 
     </dependency> 
     <dependency> 
      <groupId>io.netty</groupId> 
      <artifactId>netty-all</artifactId> 
      <version>4.0.21.Final</version> 
     </dependency> 
     <dependency> 
      <groupId>com.fasterxml.jackson.core</groupId> 
      <artifactId>jackson-databind</artifactId> 
      <version>2.3.5</version> 
     </dependency> 
     <dependency> 
      <groupId>com.fasterxml.jackson.dataformat</groupId> 
      <artifactId>jackson-dataformat-xml</artifactId> 
      <version>2.3.5</version> 
     </dependency> 
     <dependency> 
      <groupId>org.slf4j</groupId> 
      <artifactId>slf4j-jdk14</artifactId> 
      <version>1.7.7</version> 
     </dependency> 
     <dependency> 
      <groupId>junit</groupId> 
      <artifactId>junit</artifactId> 
      <version>4.10</version> 
      <scope>test</scope> 
     </dependency> 
     <dependency> 
      <groupId>org.antlr</groupId> 
      <artifactId>antlr4-maven-plugin</artifactId> 
      <version>4.2.2</version> 
     </dependency> 
     <dependency> 
      <groupId>org.fiware.kiara</groupId> 
      <artifactId>kiaraparser</artifactId> 
      <version>0.2.0</version> 
     </dependency> 
</dependencies> 
...

他们成功地包含在类路径中。然而，当我尝试在项目中使用它们：

import com.google.common.util.concurrent.ListenableFuture; 
import io.netty.util.concurrent.Future; 
import io.netty.util.concurrent.GenericFutureListener;

以下错误抛出：

Error:(20, 41) java: package com.google.common.util.concurrent does not exist 
Error:(21, 32) java: package io.netty.util.concurrent does not exist 
Error:(22, 32) java: package io.netty.util.concurrent does not exist 
Error:(34, 81) java: cannot find symbol 
    symbol: class ListenableFuture 
Error:(34, 59) java: cannot find symbol 
    symbol: class Future

该库是存在于类路径：