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The Codex »
Installing Java on CentOS
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<h1 id="installing-java-on-centos">Installing Java on CentOS</h1>
<p>Verified as of CentOS 5.8, Java 6. CentOS 6 users: fucking switch to Debian
already. Is something wrong with you? Do you like being abused by your
vendors?</p>
<h2 id="from-package-management-yum">From Package Management (Yum)</h2>
<p>OpenJDK is available via <a href="http://fedoraproject.org/wiki/EPEL/FAQ">EPEL</a>, from
the Fedora project. Install EPEL before proceeding.</p>
<p>You didn't install EPEL. Go install EPEL. <a href="http://fedoraproject.org/wiki/EPEL/FAQ#Using_EPEL">The directions are in the EPEL
FAQ</a>.</p>
<p>Now install the JDK:</p>
<pre><code>sudo yum install java-1.6.0-openjdk-devel
</code></pre>
<p>Or just the runtime:</p>
<pre><code>sudo yum install java-1.6.0-openjdk
</code></pre>
<p>The RPMs place the appropriate binaries in <code>/usr/bin</code>.</p>
<p>Applications that can't autodetect the JDK may need <code>JAVA_HOME</code> set to
<code>/usr/lib/jvm/java-openjdk</code>.</p>
<h2 id="by-hand">By Hand</h2>
<p>The <a href="http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html">Java SE Development Kit
7</a>
tarballs can be installed by hand. Download the “Linux x64” <code>.tar.gz</code> version,
then unpack it in <code>/opt</code>:</p>
<pre><code>cd /opt
tar xzf ~/jdk-7u45-linux-x64.tar.gz
</code></pre>
<p>This will create a directory named <code>/opt/jdk1.7.0_45</code> (actual version number
may vary) containing a ready-to-use Java dev kit.</p>
<p>You will need to add the JDK's <code>bin</code> directory to <code>PATH</code> if you want commands
like <code>javac</code> and <code>java</code> to work without fully-qualifying the directory:</p>
<pre><code>cat > /etc/profile.d/oracle_jdk <<'ORACLE_JDK'
PATH="${PATH}:/opt/jdk1.7.0_45/bin"
export PATH
ORACLE_JDK
</code></pre>
<p>(This will not affect non-interactive use; setting PATH for non-interactive
programs like build servers is beyond the scope of this document. Learn to use
your OS.)</p>
<p>Installation this way does <em>not</em> interact with the alternatives system (but
you can set that up by hand if you need to).</p>
<p>For tools that cannot autodetect the JDK via <code>PATH</code>, you may need to set
<code>JAVA_HOME</code> to <code>/opt/jdk1.7.0_45</code>.</p>
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