nature) is not a declared method of the class, or
 if the method signature is not valid, or if the method is not a static method.</dd>
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<h4>defineFunction</h4>
<pre>public&nbsp;void&nbsp;defineFunction(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbs