title: Installing Java 7 on Ubuntu
body: <p>to install java I have always used the classic way from the terminal.
  I would like to install java manually.
  I placed the folder of the JDK on the desk and I set environment variables (PATH, CLASSPATH and JAVA_HOME).
  From the terminal, if I type <code>java -version</code> I get printed</p>
  
  <pre><code>foralobo@ubuntu-vincy:~$ java -version
  java version "1.7.0_21"
  Java(TM) SE Runtime Environment (build 1.7.0_21-b11)
  Java HotSpot(TM) 64-Bit Server VM (build 23.21-b01, mixed mode)
  </code></pre>
  
  <p>But when I try to install eclipse or netbeans, the system warns by saying that there is no java installed on the machine.</p>
  
  <p>What is missing to compleatare manual installation?
  (Ubuntu 13.04)</p>