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<h1>Change default java</h1>
<p>When you have both Java 6 and Java 7 installed, the default Java may not be Java 7.</p>
<p>Do this by typing <code>java -version</code>, and check the output.</p>
<ul>
<li>If the output is like <strong>"java version "1.7.0_xx"</strong>, then the default Java is Java 7, which is good.</li>
<li>If the output is like <strong>"java version "1.6.0_xx"</strong>, then the default Java is Java 6, we need to configure default Java to Java 7.</li>
</ul>
<p>If the default Java is Java 6, then do</p>
<p>On Debian/Ubuntu:</p>
<div class="codehilite"><pre><span></span><code>sudo update-alternatives --config java
</code></pre></div>
<p>On CentOS/RHEL:</p>
<div class="codehilite"><pre><span></span><code>sudo alternatives --config java
</code></pre></div>
<p>The above command will ask you to choose one of the installed Java versions as default. You should choose Java 7 here.</p>
<p>After that, re-run <code>java -version</code> to make sure the change has taken effect.</p>
<p><a href="http://unix.stackexchange.com/questions/35185/installing-openjdk-7-jdk-does-not-update-java-which-is-still-version-1-6">Reference link</a></p>
</article>
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