.oracle.com/javase/8/docs/api/java/lang/IllegalStateException.html?is-external=true" title="class or interface in java.lang">IllegalStateException</a></code> - if called outside of the observer method invocation</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0</dd>
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<h4>veto</h4>
<pre>void&nbsp;veto()</pre>
<div class="block">Forces the container to ignore this type.</div>
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<dt><span clas