Chapter 3. Prerequisites

Procedure 3.1. Install Open JDK on Red Hat Enterprise Linux

1. Subscribe to the Base Channel

   Obtain the OpenJDK from the RHN base channel. (Your installation of Red Hat Enterprise Linux is subscribed to this channel by default.)

2. Install the Package

   Use the yum utility to install OpenJDK: yum install java-1.7.0-openjdk-devel

3. Verify that OpenJDK is Now Your System Default

   To ensure that the correct JDK is set as the system default, login as root and run the alternatives command: /usr/sbin/alternatives --config java
   Select /usr/lib/jvm/jre-1.6.0-openjdk/bin/java
   Set javac /usr/sbin/alternatives --config javac
   Select /usr/lib/jvm/java-1.6.0-openjdk/bin/java

Procedure 3.2. Installing Apache Ant on Red Hat Enterprise Linux

1. Download Apache Ant

   Open a terminal and input this command: sudo yum install ant-trax

2. Install Apache Ant

   Enter Y when prompted to do so by the installer.

3. Add the ANT_HOME Environment Variable

   1. vi ~/.bash_profile.
   2. Add the following line:

   export ANT_HOME=/FILEPATH/ant

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   where filepath is the directory in which Apache Ant was installed. Save and exit vi.

   Example 3.1. 

   export ANT_HOME=/opt/apache-ant-1.8.2

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4. Append the Ant installation's bin directory to the Path environmental variable.

   1. vi ~/.bash_profile.
   2. Add the following line and then save and exit vi:

   export PATH=$PATH:$ANT_HOME/bin

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5. Test the installation

   Go back to your terminal and run ant -version. The output should resemble the following:

   [localhost]$ ant -version
   Apache Ant(TM) version 1.8.2 compiled on July 6 2011
   

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Procedure 3.3. Installing Apache Ant on Microsoft Windows

1. Download Apache Ant

   Download the latest Apache Ant binary release from http://ant.apache.org/.

2. Extract Apache Ant

   Extract the files to a preferred installation location such as:

   • c:\Program Files\Apache\Ant\

3. Add the ANT_HOME Environment Variable

   1. Click on the Start Menu.
   2. Open the Control Panel.
   3. Select System Advanced Environment Variables
   4. Create a new variable called ANT_HOME.
   5. Configure the ANT_HOME variable so that it points to the Apache Ant directory.

4. Append the bin directory of the Ant installation to the Path environmental variable.

   1. Click on the Start Menu.
   2. Open the Control Panel.
   3. Select System Advanced Environment Variables System Variables
   4. Edit the PATH variable and append the text:

   ;%ANT_HOME%\bin

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5. Test the installation

   Run ant -version in a command line terminal. The version number should appear.