k classes is <code>null</code>.</dd>
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<h3><a id="register(java.lang.Object)">register</a></h3>
<div class="memberSignature"><span class="returnType"><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html?is-external=true" title="class or interface in 