title: Apache commons-io dependency error in build.gradle
body: <p>I'm also facing this issue in Gradle dependency, when i use below method:</p>
  
  <pre><code>FileUtils.writeStringToFile(File, String with data);
  FileUtils.writeStringToFile(File, String with data, String encoding);
  </code></pre>
  
  <p>The eclipse showing <code>'method doesn't exist'</code> error. So I have updated my build.gradle dependency as below:</p>
  
  <pre><code>compile group: 'commons-io', name: 'commons-io', version: '2.4'
  </code></pre>
  
  <p>but this common-io 2.4 version jar is not downloading, I have modified again as below, actually it is getting downloaded and method doesn't exist issue also resloved</p>
  
  <pre><code>compile ('org.apache.commons:commons-io:2.4')
  </code></pre>
  
  <p>But now I am getting <code>"Illegal entry in Gradle Dependencies: D:/eclipse-jee-luna-SR2-win32-x86_64/eclipse/unresolved dependency - org.apache.commons commons-io 2.4"</code></p>
  
  <p>Java version details:</p>
  
  <blockquote>
    <p>java version "1.8.0_60" Java(TM) SE Runtime Environment (build 1.8.0_60-b27) Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)</p>
  </blockquote>
  
  <p>Gradle version details:</p>
  
  <blockquote>
    <p>Gradle 2.7 Groovy: 2.3.10 Ant: Apache Ant(TM) version 1.9.3 compiled on December 23 2013 JVM: 1.8.0_60 (Oracle Corporation 25.60-b23) OS: Windows 8.1 6.3 amd64</p>
  </blockquote>
  
  <p>Please help me on this issue.</p>