Convenience method, functionally equivalent to:
<pre>
   readPropertiesAs(System.getProperties(), schema, valueType);
</pre></div>
<dl>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.9</dd>
</dl>
</li>
</ul>
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