Can't find Guava 20.0-SNAPSHOT artifact
<p>I have a project hosted on GitHub, with a branch I'm using for developing a new version: <a href="https://github.com/jrtom/jung/tree/common.graph" rel="nofollow">https://github.com/jrtom/jung/tree/common.graph</a></p>

<p>The master branch (v2.1.1) builds fine.</p>

<p>The <code>common.graph</code> branch differs from <code>master</code> in only two ways:</p>

<ol>
<li>I've bumped the version in the <code>pom.xml</code> files from <code>2.2-SNAPSHOT</code> to <code>3.0-SNAPSHOT</code>.  This is effectively cosmetic.</li>
<li>I've bumped the Guava dependency version from <code>19.0</code> to <code>20.0-SNAPSHOT</code>, so that I can start developing against the new features.
This is the correct dependency per the Guava documentation: <a href="https://github.com/google/guava#snapshots" rel="nofollow">https://github.com/google/guava#snapshots</a></li>
</ol>

<p>A pull request of the <code>common.graph</code> branch successfully builds via Travis: <a href="https://github.com/jrtom/jung/pull/65" rel="nofollow">https://github.com/jrtom/jung/pull/65</a></p>

<p>However, when I clone this branch:</p>

<pre><code>git clone --branch common.graph --single-branch git@github.com:jrtom/jung.git jung_3.0
</code></pre>

<p>and then run <code>mvn install</code>, I get this error:</p>

<pre><code>Failed to execute goal on project jung-api: 
Could not resolve dependencies for project net.sf.jung:jung-api:jar:3.0-SNAPSHOT:
Could not find artifact com.google.guava:guava:jar:20.0-SNAPSHOT
</code></pre>

<p>Blowing away the local repository under ~/.m2/repository has no effect.</p>

<p>As far as I can tell--from reading Maven documentation, from looking at other <code>pom.xml</code> files that reference Guava's snapshot of v20--this change should Just Work, but it doesn't.</p>

<p>Changing the Guava dependency to <code>18.0</code> <strong>does</strong> work.  So it seems like something wacky with the <code>-SNAPSHOT</code> specification, but I don't see how.</p>

<p>Any advice/pointers would be appreciated.</p>

<p><strong>UPDATE</strong>: </p>

<p>@RC.'s response below pointed me in the correct direction, although I still needed to figure out the right repository spec for Google snapshots.  For future reference, here's the spec:</p>

<pre><code>&lt;repositories&gt;
  &lt;repository&gt;
    &lt;id&gt;google-snapshots&lt;/id&gt;
    &lt;url&gt;https://oss.sonatype.org/content/repositories/snapshots/&lt;/url&gt;
    &lt;releases&gt;
      &lt;enabled&gt;false&lt;/enabled&gt;
    &lt;/releases&gt;
    &lt;snapshots&gt;
      &lt;enabled&gt;true&lt;/enabled&gt;
    &lt;/snapshots&gt;
  &lt;/repository&gt;
&lt;/repositories&gt;
</code></pre>